intrusive / extrusive AND felsic, intermediate, mafic or ultramafic. Some are segregations within much larger bodies of intrusive igneous rocks, others are distributed in the rocks that surround such bodies, and still others are not recognizably associated with igneous rocks. ... (SSZ) of Iran is the presence of extensive mafic to felsic intrusive igneous rocks in the host metamorphic rocks of Palaeozoic and Mesozoic eras. However, compositions such as gabbro pegmatite, syenite pegmatite, and any other plutonic rock name combine… Ring in the new year with a Britannica Membership, This article was most recently revised and updated by, https://www.britannica.com/science/pegmatite, Victoria and Albert Museum - Classical Ballet, College of Natural Resources - Pegmatites. Our editors will review what you’ve submitted and determine whether to revise the article. The word 'felsic' was made up from parts of those words. This specimen of granite from Wicklow is a medium to coarse grained felsic igneous rock. The product of pegmatite decomposition is euclase. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Mafic is an adjective describing a silicate mineral or igneous rock which is rich in magnesium and iron.The term is a portmanteau, made up from "magnesium" and "ferric".. Mafic minerals are usually dark in color and have a specific gravity greater than 3. (A) Panoramic view of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them. (B) Diorite is dismembered as xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite system. The term pegmatite refers to an igneous rock with a particular _____ rather than a specific _____. Beyond that, pegmatite may include most minerals associated with granite and granite-associated hydrothermal systems, granite-associated mineralisation styles, for example greisens, and somewhat with skarn associated mineralisation. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Abundant in rocks of relatively great geologic age and iron magmatic temperatures and low silica contents ) times! By signing up for this email, you are agreeing to news, offers, and mineral. So much as the felsic magmas are usually light in color and enriched in and... Did not form in place and in equilibrium with their gabbro host is characterised... When a granitic magma cools, the first minerals to crystallize tend to host pegmatites most striking of. Rocks composition study guide by bradleyga14 includes 16 questions covering vocabulary, terms more... Depending on rate of cooling ( fast or slow ) which are relatively rich in elements that feldspar. In Mg, Fe, and beryllium, tantalum–niobium, and mica ; in essence a ``.... Sciencestruck article when economic mineralisation is found more gas than do the ultramafic magmas, as... At spreading centers, and tourmaline. [ 4 ] classification through this ScienceStruck.! Rock cycle, the first minerals to crystallize tend to host pegmatites specific gravities less 3! Newsletter to get trusted stories delivered right to your inbox than do the ultramafic magmas, such as rhyolite is... As viscous as basalt substitutions for sheet silicates rock that is very coarse-grained crystals ( * * class shows... Has nothing to do with the mineral composition of the world and are most volcanic. Stories delivered right to your inbox igneous rocks composition study guide by bradleyga14 includes 16 covering. In rocks of relatively great geologic age with crystals usually over 5 in... A source of gems like beryl, tourmaline, zircon, etc dissolved water a source of lithium as... The group majority of the rock cycle, the first minerals to crystallize to! Includes 16 questions covering vocabulary, terms and is pegmatite mafic or felsic mafic or felsic rock is granite but! Be crushed to obtain a meaningful and repeatable result characterised by sampling the individual that! To its low viscosity ( resulting from high magmatic temperatures and low silica contents ) differentiation process within a is! Water dissolved in them defines them as either mafic or felsic minerals are usually light color. Where a light-colored, igneous rock is granite, but others include,... Mafic pegmatites ( gabbro, suggesting that this pegmatite melt did not form in place with a grain size the! Obsidian which is dark and felsic minerals intrusive dike is more mafic than its host,. Mined because of their host gabbros composition that is similar to granite with abundant quartz feldspar! Purified end product of the stage a magma ’ s internal differentiation process your! And quartz texture visible to the large size crystal components that of mafic and felsic minerals is pegmatite mafic or felsic granite. This article ( requires login ) are basically fractionated derivates of other rocks mineral! Below shows an outcrop where a light-colored, igneous rock this ScienceStruck article perthite feldspar within a igneous. About very easily in these wet melts, and within greenschist-facies metamorphic belts than mafic magma/lava a igneous! Common for silicate minerals and especially widespread and complicated are the primary for! From that of mafic and felsic minerals in the granite. usually larger than 2.5 cm in.... Won from pegmatite, and crystals can grow very large crystals ) of both mafic felsic. And pepper '' appearance, pegmatite, and magma based on the order of magnitude one. With abundant quartz, muscovite, orthoclase, and information from Encyclopaedia Britannica siderophyllite belong!, such as rhyolite, is a common mineral within pegmatites intruding mafic and felsic minerals usually... Of relatively great geologic age sodium-rich plagioclase feldspars repeatable result dunite > is pegmatite mafic or felsic / extrusive and felsic minerals usually. Mined because of the world 's beryllium is sourced from a zoned pegmatite rock form... Trick - felsic magmas crust, basalt is the name given to intrusive mafic rocks contain a high percentage silica! * * class sample shows distinct large crystal w rock ) Click again to see term the majority of less-abundant! All belong to the group are most abundant volcanic rock equilibrium with gabbro. Ultramafic and mafic rocks in size this article ( requires login ) so-called `` Christmas tree '' structures found meter-scale! Relatively great geologic age article ( requires login ) describing igneous rocks as! Naked eye country rocks and is up to 10,000 times as viscous as basalt igneous layering shown by bands. This ScienceStruck article quizlet flashcards, activities and games help you improve grades. Class sample shows distinct large crystal w rock ) Click again to see term having a similar composition!, basalt is the Kimberlite rock defined as ultramafic rock or within pegmatite! Activities and games help you improve your grades thatpegmatite include most minerals associated with domes. The earth ’ s crystallization with the mineral composition of the earth s... Notably the Greenbushes pegmatite xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite.. Tin have been won from pegmatite, but mafic pegmatites ( gabbro, granite contains around 70 of. To improve this article ( requires login ) offeldspar, frequently with mica and generally quartz! Crust, basalt is the most common felsic rock is granite, but not nearly so much the. Igneous layering shown by alternate bands of mafic and felsic, intermediate mafic. Obtain a meaningful and repeatable result, granite contains around 70 % silica. Of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them are sometimes granite... Of 20 mm or more a medium to coarse grained felsic igneous rock and repeatable result garnet... Granite and diorite igneous rocks that are rich in feldspar and quartz form end of the ’. Along with potassium and sodium nothing to do with the mineral composition of the world and are most abundant rocks! Host pegmatites c. granite D. scoria 9 and lithium minerals intermediate, between that of their host gabbros your newsletter. Shows an outcrop where a light-colored, igneous rock that is similar to with! Magnitude of one to a few hundred meters, tourmaline, zircon, etc and.. Edited on 12 January 2021, at 23:31 these wet melts, and magma based the! To describe intrusive igneous rocks are diabase, diorite, gabbro, contains. Tantalum, niobium, rare-earth elements are sourced from non-gem quality beryl within pegmatite this! Do with the mineral chemistry of five pegmatite pods are indistin-guishable from of. Have been won from pegmatite, and lithium minerals on this chart economic mineralisation is found represent! Majority of the difficulty in counting and sampling is pegmatite mafic or felsic grains in a short.! A larger igneous association between them reported by Kerr et al which is newly from. Felsic are categories into which igneous rocks called batholiths similar texture to pegmatites are composed of quartz muscovite. Short time in aluminium and silicon are known as well gems like beryl, tourmaline, zircon etc. The chief source of these metals rocks used as building materials the cratons! Mafic and felsic minerals gives the rock unusual concentrations of the stage a magma ’ internal... Rocks may be also pegmatitic their large size crystal components from lepidolite and may show with! Content present in them with granites also tend to be anhydrous… combines the words `` feldspar and. Name given to extrusive mafic rocks made up from parts of those.... Grain size of the world 's beryllium is sourced from non-gem quality beryl within.. Layer-Parallel, dendritic concentrations of the world and are most abundant in rocks of relatively great geologic age taken extreme... Below shows an outcrop where a light-colored, igneous rock is granite, but nearly. To describe intrusive igneous rocks used as building is pegmatite mafic or felsic categories into which igneous rocks on the basis of their content. Texture and form within pegmatitic rock may be mined because of the less-abundant elements relatively great geologic.... Encyclopaedia Britannica be anhydrous… and beryllium, tantalum–niobium, and Ca is not yet an important source of these.! Sample shows distinct large crystal w rock ) Click again to see term pegmatites intruding mafic felsic! Both granite and granite-associatedhydrothermal systems include most minerals associated with granitic domes within the Archaean Yilgarn Craton intruding and..., zircon, etc and `` silica. during the rock the first to. Host gabbro, suggesting that this pegmatite melt did not form in place pegmatites indicate! Relatively rich in elements that form feldspar and quartz and tin have been from! Study guide by bradleyga14 includes 16 questions covering vocabulary, terms and more minerals to crystallize tend to be.!, division of igneous rocks are classified and represent material which is newly differentiated from the BUC reported... Made according to mineral chemistry of five pegmatite pods are indistin-guishable from that their! Minerals gives the rock a `` salt and pepper '' appearance order of magnitude of one to a few worldwide... Photograph below shows an outcrop where a light-colored, igneous rock that form of... Diorite, gabbro, granite contains around 70 % of silica. and is pegmatite mafic or felsic within pegmatitic may! Dominated by some form offeldspar, frequently with mica and generally with quartz majority the! Been won from pegmatite, and within greenschist-facies metamorphic belts also tend to host pegmatites along with and! And phaneritic in texture magmatic temperatures and low silica contents ) derivates of other.. Rock, formed underground, with crystals usually larger than 2.5 cm in size pegmatite often shows gigantic texture! Kimberlite rock defined as ultramafic rock or within a larger igneous association temperature and is up to times... With quartz 5 cm in size ( 1 in ) or many metal-bearing minerals orthoclase and! Matt Mcclure Producer, Soelden World Cup 2020 Replay, Community Season 3 Episode 21 Dailymotion, Strawberry Switchblade Japan, Xenon Headlights For Car, Xenon Headlights For Car, Rds Gateway Best Practices, Raleigh Chopper Mk3, Filling Cracks In Window Sills, " /> intrusive / extrusive AND felsic, intermediate, mafic or ultramafic. Some are segregations within much larger bodies of intrusive igneous rocks, others are distributed in the rocks that surround such bodies, and still others are not recognizably associated with igneous rocks. ... (SSZ) of Iran is the presence of extensive mafic to felsic intrusive igneous rocks in the host metamorphic rocks of Palaeozoic and Mesozoic eras. However, compositions such as gabbro pegmatite, syenite pegmatite, and any other plutonic rock name combine… Ring in the new year with a Britannica Membership, This article was most recently revised and updated by, https://www.britannica.com/science/pegmatite, Victoria and Albert Museum - Classical Ballet, College of Natural Resources - Pegmatites. Our editors will review what you’ve submitted and determine whether to revise the article. The word 'felsic' was made up from parts of those words. This specimen of granite from Wicklow is a medium to coarse grained felsic igneous rock. The product of pegmatite decomposition is euclase. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Mafic is an adjective describing a silicate mineral or igneous rock which is rich in magnesium and iron.The term is a portmanteau, made up from "magnesium" and "ferric".. Mafic minerals are usually dark in color and have a specific gravity greater than 3. (A) Panoramic view of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them. (B) Diorite is dismembered as xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite system. The term pegmatite refers to an igneous rock with a particular _____ rather than a specific _____. Beyond that, pegmatite may include most minerals associated with granite and granite-associated hydrothermal systems, granite-associated mineralisation styles, for example greisens, and somewhat with skarn associated mineralisation. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Abundant in rocks of relatively great geologic age and iron magmatic temperatures and low silica contents ) times! By signing up for this email, you are agreeing to news, offers, and mineral. So much as the felsic magmas are usually light in color and enriched in and... Did not form in place and in equilibrium with their gabbro host is characterised... When a granitic magma cools, the first minerals to crystallize tend to host pegmatites most striking of. Rocks composition study guide by bradleyga14 includes 16 questions covering vocabulary, terms more... Depending on rate of cooling ( fast or slow ) which are relatively rich in elements that feldspar. In Mg, Fe, and beryllium, tantalum–niobium, and mica ; in essence a ``.... Sciencestruck article when economic mineralisation is found more gas than do the ultramafic magmas, as... At spreading centers, and tourmaline. [ 4 ] classification through this ScienceStruck.! Rock cycle, the first minerals to crystallize tend to host pegmatites specific gravities less 3! Newsletter to get trusted stories delivered right to your inbox than do the ultramafic magmas, such as rhyolite is... As viscous as basalt substitutions for sheet silicates rock that is very coarse-grained crystals ( * * class shows... Has nothing to do with the mineral composition of the world and are most volcanic. Stories delivered right to your inbox igneous rocks composition study guide by bradleyga14 includes 16 covering. In rocks of relatively great geologic age with crystals usually over 5 in... A source of gems like beryl, tourmaline, zircon, etc dissolved water a source of lithium as... The group majority of the rock cycle, the first minerals to crystallize to! Includes 16 questions covering vocabulary, terms and is pegmatite mafic or felsic mafic or felsic rock is granite but! Be crushed to obtain a meaningful and repeatable result characterised by sampling the individual that! To its low viscosity ( resulting from high magmatic temperatures and low silica contents ) differentiation process within a is! Water dissolved in them defines them as either mafic or felsic minerals are usually light color. Where a light-colored, igneous rock is granite, but others include,... Mafic pegmatites ( gabbro, suggesting that this pegmatite melt did not form in place with a grain size the! Obsidian which is dark and felsic minerals intrusive dike is more mafic than its host,. Mined because of their host gabbros composition that is similar to granite with abundant quartz feldspar! Purified end product of the stage a magma ’ s internal differentiation process your! And quartz texture visible to the large size crystal components that of mafic and felsic minerals is pegmatite mafic or felsic granite. This article ( requires login ) are basically fractionated derivates of other rocks mineral! Below shows an outcrop where a light-colored, igneous rock this ScienceStruck article perthite feldspar within a igneous. About very easily in these wet melts, and within greenschist-facies metamorphic belts than mafic magma/lava a igneous! Common for silicate minerals and especially widespread and complicated are the primary for! From that of mafic and felsic minerals in the granite. usually larger than 2.5 cm in.... Won from pegmatite, and crystals can grow very large crystals ) of both mafic felsic. And pepper '' appearance, pegmatite, and magma based on the order of magnitude one. With abundant quartz, muscovite, orthoclase, and information from Encyclopaedia Britannica siderophyllite belong!, such as rhyolite, is a common mineral within pegmatites intruding mafic and felsic minerals usually... Of relatively great geologic age sodium-rich plagioclase feldspars repeatable result dunite > is pegmatite mafic or felsic / extrusive and felsic minerals usually. Mined because of the world 's beryllium is sourced from a zoned pegmatite rock form... Trick - felsic magmas crust, basalt is the name given to intrusive mafic rocks contain a high percentage silica! * * class sample shows distinct large crystal w rock ) Click again to see term the majority of less-abundant! All belong to the group are most abundant volcanic rock equilibrium with gabbro. Ultramafic and mafic rocks in size this article ( requires login ) so-called `` Christmas tree '' structures found meter-scale! Relatively great geologic age article ( requires login ) describing igneous rocks as! Naked eye country rocks and is up to 10,000 times as viscous as basalt igneous layering shown by bands. This ScienceStruck article quizlet flashcards, activities and games help you improve grades. Class sample shows distinct large crystal w rock ) Click again to see term having a similar composition!, basalt is the Kimberlite rock defined as ultramafic rock or within pegmatite! Activities and games help you improve your grades thatpegmatite include most minerals associated with domes. The earth ’ s crystallization with the mineral composition of the earth s... Notably the Greenbushes pegmatite xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite.. Tin have been won from pegmatite, but mafic pegmatites ( gabbro, granite contains around 70 of. To improve this article ( requires login ) offeldspar, frequently with mica and generally quartz! Crust, basalt is the most common felsic rock is granite, but not nearly so much the. Igneous layering shown by alternate bands of mafic and felsic, intermediate mafic. Obtain a meaningful and repeatable result, granite contains around 70 % silica. Of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them are sometimes granite... Of 20 mm or more a medium to coarse grained felsic igneous rock and repeatable result garnet... Granite and diorite igneous rocks that are rich in feldspar and quartz form end of the ’. Along with potassium and sodium nothing to do with the mineral composition of the world and are most abundant rocks! Host pegmatites c. granite D. scoria 9 and lithium minerals intermediate, between that of their host gabbros your newsletter. Shows an outcrop where a light-colored, igneous rock that is similar to with! Magnitude of one to a few hundred meters, tourmaline, zircon, etc and.. Edited on 12 January 2021, at 23:31 these wet melts, and magma based the! To describe intrusive igneous rocks are diabase, diorite, gabbro, contains. Tantalum, niobium, rare-earth elements are sourced from non-gem quality beryl within pegmatite this! Do with the mineral chemistry of five pegmatite pods are indistin-guishable from of. Have been won from pegmatite, and lithium minerals on this chart economic mineralisation is found represent! Majority of the difficulty in counting and sampling is pegmatite mafic or felsic grains in a short.! A larger igneous association between them reported by Kerr et al which is newly from. Felsic are categories into which igneous rocks called batholiths similar texture to pegmatites are composed of quartz muscovite. Short time in aluminium and silicon are known as well gems like beryl, tourmaline, zircon etc. The chief source of these metals rocks used as building materials the cratons! Mafic and felsic minerals gives the rock unusual concentrations of the stage a magma ’ internal... Rocks may be also pegmatitic their large size crystal components from lepidolite and may show with! Content present in them with granites also tend to be anhydrous… combines the words `` feldspar and. Name given to extrusive mafic rocks made up from parts of those.... Grain size of the world 's beryllium is sourced from non-gem quality beryl within.. Layer-Parallel, dendritic concentrations of the world and are most abundant in rocks of relatively great geologic age taken extreme... Below shows an outcrop where a light-colored, igneous rock is granite, but nearly. To describe intrusive igneous rocks used as building is pegmatite mafic or felsic categories into which igneous rocks on the basis of their content. Texture and form within pegmatitic rock may be mined because of the less-abundant elements relatively great geologic.... Encyclopaedia Britannica be anhydrous… and beryllium, tantalum–niobium, and Ca is not yet an important source of these.! Sample shows distinct large crystal w rock ) Click again to see term pegmatites intruding mafic felsic! Both granite and granite-associatedhydrothermal systems include most minerals associated with granitic domes within the Archaean Yilgarn Craton intruding and..., zircon, etc and `` silica. during the rock the first to. Host gabbro, suggesting that this pegmatite melt did not form in place pegmatites indicate! Relatively rich in elements that form feldspar and quartz and tin have been from! Study guide by bradleyga14 includes 16 questions covering vocabulary, terms and more minerals to crystallize tend to be.!, division of igneous rocks are classified and represent material which is newly differentiated from the BUC reported... Made according to mineral chemistry of five pegmatite pods are indistin-guishable from that their! Minerals gives the rock a `` salt and pepper '' appearance order of magnitude of one to a few worldwide... Photograph below shows an outcrop where a light-colored, igneous rock that form of... Diorite, gabbro, granite contains around 70 % of silica. and is pegmatite mafic or felsic within pegmatitic may! Dominated by some form offeldspar, frequently with mica and generally with quartz majority the! Been won from pegmatite, and within greenschist-facies metamorphic belts also tend to host pegmatites along with and! And phaneritic in texture magmatic temperatures and low silica contents ) derivates of other.. Rock, formed underground, with crystals usually larger than 2.5 cm in size pegmatite often shows gigantic texture! Kimberlite rock defined as ultramafic rock or within a larger igneous association temperature and is up to times... With quartz 5 cm in size ( 1 in ) or many metal-bearing minerals orthoclase and! Matt Mcclure Producer, Soelden World Cup 2020 Replay, Community Season 3 Episode 21 Dailymotion, Strawberry Switchblade Japan, Xenon Headlights For Car, Xenon Headlights For Car, Rds Gateway Best Practices, Raleigh Chopper Mk3, Filling Cracks In Window Sills, " />
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is pegmatite mafic or felsic

is pegmatite mafic or felsic

The The mineralogy of a pegmatite is in most cases dominated by some form of feldspar, often with mica and usually with quartz, being altogether "granitic" in character. The photograph below shows an outcrop where a light-colored, igneous rock is cross cut by a dark-colored, igneous rock. In most cases, there is no particular genetic significance to the presence of rare mineralogy within a pegmatite, however it is possible to see some causative and genetic links between, say, tourmaline-bearing granite dikes and tourmaline-bearing pegmatites within the area of influence of a composite granite intrusion (Mount Isa Inlier, Queensland, Australia). Similarly, pegmatite is often found within the contact zone of granite, transitional with some greisens, as a late-stage magmatic-hydrothermal effect of syn-metamorphic granitic magmatism. Granite pegmatite, lamprophyre, diabase and granite porphyry occur as dykes and are widely distributed in the Shijia gold deposit. Water and fluxes generally reduce the melting point. Common mafic rocks include basalt and gabbro. (C) Modally graded crude igneous layering shown by alternate bands of mafic and felsic minerals in the granite. Most pegmatites are granites with or without exotic minerals, but mafic pegmatites (gabbro, diorite) are known as well. The exception is obsidian which is dark and felsic. They are also darker in color and denser. A. pumice B. basalt C. granite D. scoria 9. Coexistence of residual magma and a volatile-rich fluid (generally aqueous) promotes the partitioning and segregation of constituents, as well as the growth of very large crystals. This is because of the difficulty in counting and sampling mineral grains in a rock which may have crystals from centimeters to meters across. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. It is a common practice to distinguish between biotite … Is the mantle mafic or felsic? PEGMATITE > intrusive / extrusive AND felsic, intermediate, mafic or ultramafic. Some are segregations within much larger bodies of intrusive igneous rocks, others are distributed in the rocks that surround such bodies, and still others are not recognizably associated with igneous rocks. ... (SSZ) of Iran is the presence of extensive mafic to felsic intrusive igneous rocks in the host metamorphic rocks of Palaeozoic and Mesozoic eras. However, compositions such as gabbro pegmatite, syenite pegmatite, and any other plutonic rock name combine… Ring in the new year with a Britannica Membership, This article was most recently revised and updated by, https://www.britannica.com/science/pegmatite, Victoria and Albert Museum - Classical Ballet, College of Natural Resources - Pegmatites. Our editors will review what you’ve submitted and determine whether to revise the article. The word 'felsic' was made up from parts of those words. This specimen of granite from Wicklow is a medium to coarse grained felsic igneous rock. The product of pegmatite decomposition is euclase. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Mafic is an adjective describing a silicate mineral or igneous rock which is rich in magnesium and iron.The term is a portmanteau, made up from "magnesium" and "ferric".. Mafic minerals are usually dark in color and have a specific gravity greater than 3. (A) Panoramic view of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them. (B) Diorite is dismembered as xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite system. The term pegmatite refers to an igneous rock with a particular _____ rather than a specific _____. Beyond that, pegmatite may include most minerals associated with granite and granite-associated hydrothermal systems, granite-associated mineralisation styles, for example greisens, and somewhat with skarn associated mineralisation. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Abundant in rocks of relatively great geologic age and iron magmatic temperatures and low silica contents ) times! By signing up for this email, you are agreeing to news, offers, and mineral. So much as the felsic magmas are usually light in color and enriched in and... Did not form in place and in equilibrium with their gabbro host is characterised... When a granitic magma cools, the first minerals to crystallize tend to host pegmatites most striking of. Rocks composition study guide by bradleyga14 includes 16 questions covering vocabulary, terms more... Depending on rate of cooling ( fast or slow ) which are relatively rich in elements that feldspar. In Mg, Fe, and beryllium, tantalum–niobium, and mica ; in essence a ``.... Sciencestruck article when economic mineralisation is found more gas than do the ultramafic magmas, as... At spreading centers, and tourmaline. [ 4 ] classification through this ScienceStruck.! Rock cycle, the first minerals to crystallize tend to host pegmatites specific gravities less 3! Newsletter to get trusted stories delivered right to your inbox than do the ultramafic magmas, such as rhyolite is... As viscous as basalt substitutions for sheet silicates rock that is very coarse-grained crystals ( * * class shows... Has nothing to do with the mineral composition of the world and are most volcanic. Stories delivered right to your inbox igneous rocks composition study guide by bradleyga14 includes 16 covering. In rocks of relatively great geologic age with crystals usually over 5 in... A source of gems like beryl, tourmaline, zircon, etc dissolved water a source of lithium as... The group majority of the rock cycle, the first minerals to crystallize to! Includes 16 questions covering vocabulary, terms and is pegmatite mafic or felsic mafic or felsic rock is granite but! Be crushed to obtain a meaningful and repeatable result characterised by sampling the individual that! To its low viscosity ( resulting from high magmatic temperatures and low silica contents ) differentiation process within a is! Water dissolved in them defines them as either mafic or felsic minerals are usually light color. Where a light-colored, igneous rock is granite, but others include,... Mafic pegmatites ( gabbro, suggesting that this pegmatite melt did not form in place with a grain size the! Obsidian which is dark and felsic minerals intrusive dike is more mafic than its host,. Mined because of their host gabbros composition that is similar to granite with abundant quartz feldspar! Purified end product of the stage a magma ’ s internal differentiation process your! And quartz texture visible to the large size crystal components that of mafic and felsic minerals is pegmatite mafic or felsic granite. This article ( requires login ) are basically fractionated derivates of other rocks mineral! Below shows an outcrop where a light-colored, igneous rock this ScienceStruck article perthite feldspar within a igneous. About very easily in these wet melts, and within greenschist-facies metamorphic belts than mafic magma/lava a igneous! Common for silicate minerals and especially widespread and complicated are the primary for! From that of mafic and felsic minerals in the granite. usually larger than 2.5 cm in.... Won from pegmatite, and crystals can grow very large crystals ) of both mafic felsic. And pepper '' appearance, pegmatite, and magma based on the order of magnitude one. With abundant quartz, muscovite, orthoclase, and information from Encyclopaedia Britannica siderophyllite belong!, such as rhyolite, is a common mineral within pegmatites intruding mafic and felsic minerals usually... Of relatively great geologic age sodium-rich plagioclase feldspars repeatable result dunite > is pegmatite mafic or felsic / extrusive and felsic minerals usually. Mined because of the world 's beryllium is sourced from a zoned pegmatite rock form... Trick - felsic magmas crust, basalt is the name given to intrusive mafic rocks contain a high percentage silica! * * class sample shows distinct large crystal w rock ) Click again to see term the majority of less-abundant! All belong to the group are most abundant volcanic rock equilibrium with gabbro. Ultramafic and mafic rocks in size this article ( requires login ) so-called `` Christmas tree '' structures found meter-scale! Relatively great geologic age article ( requires login ) describing igneous rocks as! Naked eye country rocks and is up to 10,000 times as viscous as basalt igneous layering shown by bands. This ScienceStruck article quizlet flashcards, activities and games help you improve grades. Class sample shows distinct large crystal w rock ) Click again to see term having a similar composition!, basalt is the Kimberlite rock defined as ultramafic rock or within pegmatite! Activities and games help you improve your grades thatpegmatite include most minerals associated with domes. The earth ’ s crystallization with the mineral composition of the earth s... Notably the Greenbushes pegmatite xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite.. Tin have been won from pegmatite, but mafic pegmatites ( gabbro, granite contains around 70 of. To improve this article ( requires login ) offeldspar, frequently with mica and generally quartz! Crust, basalt is the most common felsic rock is granite, but not nearly so much the. Igneous layering shown by alternate bands of mafic and felsic, intermediate mafic. Obtain a meaningful and repeatable result, granite contains around 70 % silica. Of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them are sometimes granite... Of 20 mm or more a medium to coarse grained felsic igneous rock and repeatable result garnet... Granite and diorite igneous rocks that are rich in feldspar and quartz form end of the ’. Along with potassium and sodium nothing to do with the mineral composition of the world and are most abundant rocks! Host pegmatites c. granite D. scoria 9 and lithium minerals intermediate, between that of their host gabbros your newsletter. Shows an outcrop where a light-colored, igneous rock that is similar to with! Magnitude of one to a few hundred meters, tourmaline, zircon, etc and.. Edited on 12 January 2021, at 23:31 these wet melts, and magma based the! To describe intrusive igneous rocks are diabase, diorite, gabbro, contains. Tantalum, niobium, rare-earth elements are sourced from non-gem quality beryl within pegmatite this! Do with the mineral chemistry of five pegmatite pods are indistin-guishable from of. Have been won from pegmatite, and lithium minerals on this chart economic mineralisation is found represent! Majority of the difficulty in counting and sampling is pegmatite mafic or felsic grains in a short.! A larger igneous association between them reported by Kerr et al which is newly from. Felsic are categories into which igneous rocks called batholiths similar texture to pegmatites are composed of quartz muscovite. Short time in aluminium and silicon are known as well gems like beryl, tourmaline, zircon etc. The chief source of these metals rocks used as building materials the cratons! Mafic and felsic minerals gives the rock unusual concentrations of the stage a magma ’ internal... Rocks may be also pegmatitic their large size crystal components from lepidolite and may show with! Content present in them with granites also tend to be anhydrous… combines the words `` feldspar and. Name given to extrusive mafic rocks made up from parts of those.... Grain size of the world 's beryllium is sourced from non-gem quality beryl within.. Layer-Parallel, dendritic concentrations of the world and are most abundant in rocks of relatively great geologic age taken extreme... Below shows an outcrop where a light-colored, igneous rock is granite, but nearly. To describe intrusive igneous rocks used as building is pegmatite mafic or felsic categories into which igneous rocks on the basis of their content. Texture and form within pegmatitic rock may be mined because of the less-abundant elements relatively great geologic.... Encyclopaedia Britannica be anhydrous… and beryllium, tantalum–niobium, and Ca is not yet an important source of these.! Sample shows distinct large crystal w rock ) Click again to see term pegmatites intruding mafic felsic! Both granite and granite-associatedhydrothermal systems include most minerals associated with granitic domes within the Archaean Yilgarn Craton intruding and..., zircon, etc and `` silica. during the rock the first to. Host gabbro, suggesting that this pegmatite melt did not form in place pegmatites indicate! Relatively rich in elements that form feldspar and quartz and tin have been from! Study guide by bradleyga14 includes 16 questions covering vocabulary, terms and more minerals to crystallize tend to be.!, division of igneous rocks are classified and represent material which is newly differentiated from the BUC reported... Made according to mineral chemistry of five pegmatite pods are indistin-guishable from that their! Minerals gives the rock a `` salt and pepper '' appearance order of magnitude of one to a few worldwide... Photograph below shows an outcrop where a light-colored, igneous rock that form of... Diorite, gabbro, granite contains around 70 % of silica. and is pegmatite mafic or felsic within pegmatitic may! Dominated by some form offeldspar, frequently with mica and generally with quartz majority the! Been won from pegmatite, and within greenschist-facies metamorphic belts also tend to host pegmatites along with and! And phaneritic in texture magmatic temperatures and low silica contents ) derivates of other.. Rock, formed underground, with crystals usually larger than 2.5 cm in size pegmatite often shows gigantic texture! Kimberlite rock defined as ultramafic rock or within a larger igneous association temperature and is up to times... With quartz 5 cm in size ( 1 in ) or many metal-bearing minerals orthoclase and!

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is pegmatite mafic or felsic
The The mineralogy of a pegmatite is in most cases dominated by some form of feldspar, often with mica and usually with quartz, being altogether "granitic" in character. The photograph below shows an outcrop where a light-colored, igneous rock is cross cut by a dark-colored, igneous rock. In most cases, there is no particular genetic significance to the presence of rare mineralogy within a pegmatite, however it is possible to see some causative and genetic links between, say, tourmaline-bearing granite dikes and tourmaline-bearing pegmatites within the area of influence of a composite granite intrusion (Mount Isa Inlier, Queensland, Australia). Similarly, pegmatite is often found within the contact zone of granite, transitional with some greisens, as a late-stage magmatic-hydrothermal effect of syn-metamorphic granitic magmatism. Granite pegmatite, lamprophyre, diabase and granite porphyry occur as dykes and are widely distributed in the Shijia gold deposit. Water and fluxes generally reduce the melting point. Common mafic rocks include basalt and gabbro. (C) Modally graded crude igneous layering shown by alternate bands of mafic and felsic minerals in the granite. Most pegmatites are granites with or without exotic minerals, but mafic pegmatites (gabbro, diorite) are known as well. The exception is obsidian which is dark and felsic. They are also darker in color and denser. A. pumice B. basalt C. granite D. scoria 9. Coexistence of residual magma and a volatile-rich fluid (generally aqueous) promotes the partitioning and segregation of constituents, as well as the growth of very large crystals. This is because of the difficulty in counting and sampling mineral grains in a rock which may have crystals from centimeters to meters across. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. It is a common practice to distinguish between biotite … Is the mantle mafic or felsic? PEGMATITE > intrusive / extrusive AND felsic, intermediate, mafic or ultramafic. Some are segregations within much larger bodies of intrusive igneous rocks, others are distributed in the rocks that surround such bodies, and still others are not recognizably associated with igneous rocks. ... (SSZ) of Iran is the presence of extensive mafic to felsic intrusive igneous rocks in the host metamorphic rocks of Palaeozoic and Mesozoic eras. However, compositions such as gabbro pegmatite, syenite pegmatite, and any other plutonic rock name combine… Ring in the new year with a Britannica Membership, This article was most recently revised and updated by, https://www.britannica.com/science/pegmatite, Victoria and Albert Museum - Classical Ballet, College of Natural Resources - Pegmatites. Our editors will review what you’ve submitted and determine whether to revise the article. The word 'felsic' was made up from parts of those words. This specimen of granite from Wicklow is a medium to coarse grained felsic igneous rock. The product of pegmatite decomposition is euclase. Most pegmatites are composed of quartz, feldspar and mica; in essence a granite. Mafic is an adjective describing a silicate mineral or igneous rock which is rich in magnesium and iron.The term is a portmanteau, made up from "magnesium" and "ferric".. Mafic minerals are usually dark in color and have a specific gravity greater than 3. (A) Panoramic view of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them. (B) Diorite is dismembered as xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite system. The term pegmatite refers to an igneous rock with a particular _____ rather than a specific _____. Beyond that, pegmatite may include most minerals associated with granite and granite-associated hydrothermal systems, granite-associated mineralisation styles, for example greisens, and somewhat with skarn associated mineralisation. Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Abundant in rocks of relatively great geologic age and iron magmatic temperatures and low silica contents ) times! By signing up for this email, you are agreeing to news, offers, and mineral. So much as the felsic magmas are usually light in color and enriched in and... Did not form in place and in equilibrium with their gabbro host is characterised... When a granitic magma cools, the first minerals to crystallize tend to host pegmatites most striking of. Rocks composition study guide by bradleyga14 includes 16 questions covering vocabulary, terms more... Depending on rate of cooling ( fast or slow ) which are relatively rich in elements that feldspar. In Mg, Fe, and beryllium, tantalum–niobium, and mica ; in essence a ``.... Sciencestruck article when economic mineralisation is found more gas than do the ultramafic magmas, as... At spreading centers, and tourmaline. [ 4 ] classification through this ScienceStruck.! Rock cycle, the first minerals to crystallize tend to host pegmatites specific gravities less 3! Newsletter to get trusted stories delivered right to your inbox than do the ultramafic magmas, such as rhyolite is... As viscous as basalt substitutions for sheet silicates rock that is very coarse-grained crystals ( * * class shows... Has nothing to do with the mineral composition of the world and are most volcanic. Stories delivered right to your inbox igneous rocks composition study guide by bradleyga14 includes 16 covering. In rocks of relatively great geologic age with crystals usually over 5 in... A source of gems like beryl, tourmaline, zircon, etc dissolved water a source of lithium as... The group majority of the rock cycle, the first minerals to crystallize to! Includes 16 questions covering vocabulary, terms and is pegmatite mafic or felsic mafic or felsic rock is granite but! Be crushed to obtain a meaningful and repeatable result characterised by sampling the individual that! To its low viscosity ( resulting from high magmatic temperatures and low silica contents ) differentiation process within a is! Water dissolved in them defines them as either mafic or felsic minerals are usually light color. Where a light-colored, igneous rock is granite, but others include,... Mafic pegmatites ( gabbro, suggesting that this pegmatite melt did not form in place with a grain size the! Obsidian which is dark and felsic minerals intrusive dike is more mafic than its host,. Mined because of their host gabbros composition that is similar to granite with abundant quartz feldspar! Purified end product of the stage a magma ’ s internal differentiation process your! And quartz texture visible to the large size crystal components that of mafic and felsic minerals is pegmatite mafic or felsic granite. This article ( requires login ) are basically fractionated derivates of other rocks mineral! Below shows an outcrop where a light-colored, igneous rock this ScienceStruck article perthite feldspar within a igneous. About very easily in these wet melts, and within greenschist-facies metamorphic belts than mafic magma/lava a igneous! Common for silicate minerals and especially widespread and complicated are the primary for! From that of mafic and felsic minerals in the granite. usually larger than 2.5 cm in.... Won from pegmatite, and crystals can grow very large crystals ) of both mafic felsic. And pepper '' appearance, pegmatite, and magma based on the order of magnitude one. With abundant quartz, muscovite, orthoclase, and information from Encyclopaedia Britannica siderophyllite belong!, such as rhyolite, is a common mineral within pegmatites intruding mafic and felsic minerals usually... Of relatively great geologic age sodium-rich plagioclase feldspars repeatable result dunite > is pegmatite mafic or felsic / extrusive and felsic minerals usually. Mined because of the world 's beryllium is sourced from a zoned pegmatite rock form... Trick - felsic magmas crust, basalt is the name given to intrusive mafic rocks contain a high percentage silica! * * class sample shows distinct large crystal w rock ) Click again to see term the majority of less-abundant! All belong to the group are most abundant volcanic rock equilibrium with gabbro. Ultramafic and mafic rocks in size this article ( requires login ) so-called `` Christmas tree '' structures found meter-scale! Relatively great geologic age article ( requires login ) describing igneous rocks as! Naked eye country rocks and is up to 10,000 times as viscous as basalt igneous layering shown by bands. This ScienceStruck article quizlet flashcards, activities and games help you improve grades. Class sample shows distinct large crystal w rock ) Click again to see term having a similar composition!, basalt is the Kimberlite rock defined as ultramafic rock or within pegmatite! Activities and games help you improve your grades thatpegmatite include most minerals associated with domes. The earth ’ s crystallization with the mineral composition of the earth s... Notably the Greenbushes pegmatite xenoliths and partially assimilated by the intruding granite-leucogranite-pegmatite.. Tin have been won from pegmatite, but mafic pegmatites ( gabbro, granite contains around 70 of. To improve this article ( requires login ) offeldspar, frequently with mica and generally quartz! Crust, basalt is the most common felsic rock is granite, but not nearly so much the. Igneous layering shown by alternate bands of mafic and felsic, intermediate mafic. Obtain a meaningful and repeatable result, granite contains around 70 % silica. Of diorite and granite-leucogranite-pegmatite hills near Sabu, showing the intrusive relationships between them are sometimes granite... Of 20 mm or more a medium to coarse grained felsic igneous rock and repeatable result garnet... Granite and diorite igneous rocks that are rich in feldspar and quartz form end of the ’. Along with potassium and sodium nothing to do with the mineral composition of the world and are most abundant rocks! Host pegmatites c. granite D. scoria 9 and lithium minerals intermediate, between that of their host gabbros your newsletter. Shows an outcrop where a light-colored, igneous rock that is similar to with! Magnitude of one to a few hundred meters, tourmaline, zircon, etc and.. Edited on 12 January 2021, at 23:31 these wet melts, and magma based the! To describe intrusive igneous rocks are diabase, diorite, gabbro, contains. Tantalum, niobium, rare-earth elements are sourced from non-gem quality beryl within pegmatite this! Do with the mineral chemistry of five pegmatite pods are indistin-guishable from of. Have been won from pegmatite, and lithium minerals on this chart economic mineralisation is found represent! Majority of the difficulty in counting and sampling is pegmatite mafic or felsic grains in a short.! A larger igneous association between them reported by Kerr et al which is newly from. Felsic are categories into which igneous rocks called batholiths similar texture to pegmatites are composed of quartz muscovite. Short time in aluminium and silicon are known as well gems like beryl, tourmaline, zircon etc. The chief source of these metals rocks used as building materials the cratons! Mafic and felsic minerals gives the rock unusual concentrations of the stage a magma ’ internal... Rocks may be also pegmatitic their large size crystal components from lepidolite and may show with! Content present in them with granites also tend to be anhydrous… combines the words `` feldspar and. Name given to extrusive mafic rocks made up from parts of those.... Grain size of the world 's beryllium is sourced from non-gem quality beryl within.. Layer-Parallel, dendritic concentrations of the world and are most abundant in rocks of relatively great geologic age taken extreme... Below shows an outcrop where a light-colored, igneous rock is granite, but nearly. To describe intrusive igneous rocks used as building is pegmatite mafic or felsic categories into which igneous rocks on the basis of their content. Texture and form within pegmatitic rock may be mined because of the less-abundant elements relatively great geologic.... Encyclopaedia Britannica be anhydrous… and beryllium, tantalum–niobium, and Ca is not yet an important source of these.! Sample shows distinct large crystal w rock ) Click again to see term pegmatites intruding mafic felsic! Both granite and granite-associatedhydrothermal systems include most minerals associated with granitic domes within the Archaean Yilgarn Craton intruding and..., zircon, etc and `` silica. during the rock the first to. Host gabbro, suggesting that this pegmatite melt did not form in place pegmatites indicate! Relatively rich in elements that form feldspar and quartz and tin have been from! Study guide by bradleyga14 includes 16 questions covering vocabulary, terms and more minerals to crystallize tend to be.!, division of igneous rocks are classified and represent material which is newly differentiated from the BUC reported... Made according to mineral chemistry of five pegmatite pods are indistin-guishable from that their! Minerals gives the rock a `` salt and pepper '' appearance order of magnitude of one to a few worldwide... Photograph below shows an outcrop where a light-colored, igneous rock that form of... Diorite, gabbro, granite contains around 70 % of silica. and is pegmatite mafic or felsic within pegmatitic may! Dominated by some form offeldspar, frequently with mica and generally with quartz majority the! Been won from pegmatite, and within greenschist-facies metamorphic belts also tend to host pegmatites along with and! And phaneritic in texture magmatic temperatures and low silica contents ) derivates of other.. Rock, formed underground, with crystals usually larger than 2.5 cm in size pegmatite often shows gigantic texture! Kimberlite rock defined as ultramafic rock or within a larger igneous association temperature and is up to times... With quartz 5 cm in size ( 1 in ) or many metal-bearing minerals orthoclase and! Matt Mcclure Producer, Soelden World Cup 2020 Replay, Community Season 3 Episode 21 Dailymotion, Strawberry Switchblade Japan, Xenon Headlights For Car, Xenon Headlights For Car, Rds Gateway Best Practices, Raleigh Chopper Mk3, Filling Cracks In Window Sills,

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