华北克拉通北缘西段宝音图群片岩中石榴子石变斑晶成分特征及其动力学意义
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摘要
石榴子石变斑晶微结构和成分特征对构造和变质作用研究有重要作用。本文以华北克拉通北缘西段宝音图群石榴子石云母片岩中的石榴子石变斑晶为研究对象,通过扫描电子显微镜搭载的二次电子(SE)显微结构形貌观测,背散射电子(BSE)成分分析、能谱仪(EDS)和电子探针(EPMA)分析,得到石榴子石变斑晶组构和化学成分信息,揭示出石榴子石晶界具有化学非均质性。在MnNCFMASHO体系下采用石榴子石云母石英片岩的全岩成分计算的锰铝榴石、钙铝榴石等值线图基础上,建立了石榴子石变斑晶的p-t轨迹,反映出石榴子石变斑晶在变质峰期后经历了一个近等温降压的地质动力学过程。
The microtexture and composition characteristics of garnet porphyroblasts have played an important role in the study of tectonics and metamorphism. In this paper,the garnet porphyroblastsfrom the garnet mica schist of the Baoyintu Group in western part of the northern margin of North China Cratonhave been selected to study their microtexture and chemical composition characteristics using the SEM secondary electron( SE) microstructure and morphology observation,backscattered electron( BSE) imaging analysis,energy dispersive spectrometer( EDS) and electron probe( EPMA) analyses.Theresults show that there is chemical composition heterogeneity in garnet porphyroblasts.On the basis of the isogram of spessartite and grossularite calculated by using the whole-rock composition of garnet mica quartz schist underthe MnNCFMASHO system,we have established the p-t paths of garnet porphroblasts,revealing that garnet porphroblasts had perienced a geodynamic process of near isothermal depressurization after the metamorphic peak.
The microtexture and composition characteristics of garnet porphyroblasts have played an important role in the study of tectonics and metamorphism. In this paper,the garnet porphyroblastsfrom the garnet mica schist of the Baoyintu Group in western part of the northern margin of North China Cratonhave been selected to study their microtexture and chemical composition characteristics using the SEM secondary electron( SE) microstructure and morphology observation,backscattered electron( BSE) imaging analysis,energy dispersive spectrometer( EDS) and electron probe( EPMA) analyses.Theresults show that there is chemical composition heterogeneity in garnet porphyroblasts.On the basis of the isogram of spessartite and grossularite calculated by using the whole-rock composition of garnet mica quartz schist underthe MnNCFMASHO system,we have established the p-t paths of garnet porphroblasts,revealing that garnet porphroblasts had perienced a geodynamic process of near isothermal depressurization after the metamorphic peak.
引文
Barrow G.1983.On an intrusion of Muscovite-Biotite Gneiss in the South-eastern Highlands of Scotland,and its accompanying metamorphism.Quarterly Journal of the Geological Society,49(1-4):330-358
Bell T H,Johnson S E.1989.Porphyroblast inclusion trails:The key to orogenesis.Journal of Metamorphic Geology,7(3):279-310
Caddick M J,Konopásek J,Thompson A B.2010.Preservation of garnet growth zoning and the duration of prograde metamorphism.Journal of Petrology,51(11):2327-2347
Carlson W D,Denison C.1992.Mechanisms of porphyroblast crystallization:Results from high-resolution computed X-ray tomography.Science,257(5074):1236-1239
Carlson W D,Denison C,Ketcham R A.1995.Controls on the nucleation and growth of porphyroblasts:Kinetics from natural textures and numerical models.Geological Journal,30(3-4):207-225
Carlson W D,Pattison D R M,Caddick M J.2015.Beyond the equilibrium paradigm:How consideration of kinetics enhances metamorphic interpretation.American Mineralogist,100(8-9):1659-1667
Coggon R,Holland T J B.2002.Mixing properties of phengitic micas and revised garnet-phengitethermobarometers.Journal of Metamorphic Geology,20(7):683-696
Daniel C G,Spear F S.1998.Three-dimensional patterns of garnet nucleation and growth.Geology,26(6):503-506
Daniel C G,Spear F S.1999.The clustered nucleation and growth processes of garnet in regional metamorphic rocks from north-west Connecticut,USA.Journal of Metamorphic Geology,17(5):503-520
deCapitani C,Brown T H.1987.The computation of chemical equilibrium in complex systems containing non-ideal solutions.Geochimica et Cosmochimica Acta,51(10):2639-2652
Dempster T J,Symon S,Chung P.2017.Intergranular diffusion rates from the analysis of garnet surfaces:Implications for metamorphic equilibration.Journal of Metamorphic Geology,35(6):585-600
Enami,M.2010.Pressure-temperature path of sanbagawaprograde metamorphism deduced from grossular zoning of garnet.Journal of Metamorphic Geology,16(1),97-106
Farber K,Caddick M J,John T.2014.Controls on solid-phase inclusion during porphyroblast growth:Insights from the Barrovian sequence(Scottish Dalradian).Contributions to Mineralogy and Petrology,168(6):1089
Holdaway M J.2001.Recalibration of the GASP geobarometer in light of recent garnet and plagioclase activity models and versions of the garnet-biotitegeothermometer.American Mineralogist,86(10):1117-1129
Holland T,Baker J,Powell R.1998.Mixing properties and activitycomposition relationships of chlorites in the system Mg O-FeO-Al2O3-SiO2-H2O.European Journal of Mineralogy,10(3):395-406.
Holland T,Powell R.2003.Activity-composition relations for phases in petrological calculations:An asymmetric multicomponent formulation.Contributions to Mineralogy and Petrology,145(4):492-501
Kohn M J,Spear F.2000.Retrograde net transfer reaction insurance for pressure-temperature estimates.Geology,28(12):1127-1130
Kohn M J.2003.Geochemical zoning in metamorphic minerals.Treatise on Geochemistry,3:229-261
Kretz R.1993.A garnet population in Yellowknife schist,Canada.Journal of Metamorphic Geology,11(1):101-120
Kruhl J H,Erdmann S,Büttner S H.2007.Brittle-ductile microfabrics in naturally deformed cordierite:Evidence for significant short-term strain-rate variations.Journal of Structural Geology,29(2):355-374
Lawther S E M,Dempster T J.2009.Apatite grain boundary morphology and its response to low-temperature fluid infiltration in crystalline basement.Geofluids,9(3):224-236
Moynihan D P,Pattison D R M.2013.An automated method for the calculation of p-t paths from garnet zoning,with application to metapelitic schist from the Kootenay Arc,British Columbia,Canada.Journal of Metamorphic Geology,31(5):525-548
Miyazaki,K.2015.Diffusion-controlled growth and degree of disequilibrium of garnet porphyroblasts:is diffusion-controlled growth of porphyroblasts common?Progress in Earth&Planetary Science,2(1),1-14.
Prior D J.1987.Syntectonicporphyroblast growth in phyllites:Textures and processes.Journal of Metamorphic Geology,5(1):27-39
Putnis A,John T.2010.Replacement processes in the Earth's Crust.Elements,6(3):159-164
Reed S J B.2005.Electron Microprobe Analysis and Scanning Electron Microscopy in Geology.2nd.Cambridge:Cambridge University Press,206
Robyr M,Darbellay B,Baumgartner L P.2014.Matrix-dependent garnet growth in polymetamorphic rocks of the Sesia zone,Italian Alps.Journal of Metamorphic Geology,32(1):3-24
Spear F S,Kohn M J,Florence F P.1990.A model for garnet and plagioclase growth in peliticschists:Implications for thermobarometry and P-T path determinations.Journal of Metamorphic Geology,8(6):683-696
Spear F S.1991.On the interpretation of peak metamorphic temperatures in light of garnet diffusion during cooling.Journal of Metamorphic Geology,9(4):379-388
Spear F S.2014.The duration of near-peak metamorphism from diffusion modelling of garnet zoning.Journal of Metamorphic Geology,32(8):903-914
Theye T,Schreyer W,Fransolet A M.1996.Low-temperature,low-pressure metamorphism of Mn-rich rocks in the lienne syncline,VennStavelot Massif(Belgian Ardennes),and the role of carpholite.Journal of Petrology,37(4):767-783
Vance D,O'Nions R K.1990.Isotopic chronometry of zoned garnets:Growth kinetics and metamorphic histories.Earth and Planetary Science Letters,97(3-4):227-240
Vernon R H,White R W,Clarke G L.2008.False metamorphic events inferred from misinterpretation of microstructural evidence and p-t data.Journal of Metamorphic Geology,26(4):437-449
Viete D R,Hermann J,Lister G S,Stenhouse L R.2011.The nature and origin of the Barrovian metamorphism,Scotland:Diffusion length scales in garnet and inferred thermal time scales.Journal of the Geological Society,168(1):115-132
White R W,Pomroy N E,Powell R.2005.An in situ metatexite-diatexite transition in upper amphibolite facies rocks from Broken Hill,Australia.Journal of Metamorphic Geology,23(7):579-602
White R W,Powell R,Holland T J B.2010.Progress relating to calculation of partial melting equilibria for metapelites.Journal of Metamorphic Geology,25(5):511-527.
Whitney D L,Seaton N C A.2010.Garnet polycrystals and the significance of clustered crystallization.Contributions to Mineralogy and Petrology,160(4):591-607
Wintsch R P,Aleinikoff J N,Yi K.2005.Foliation development and reaction softening by dissolution and precipitation in the transformation of granodiorite to orthogneiss,Glastonbury Complex,Connecticut,U.S.A.Canadian Mineralogist,43(1):327-347
Yang P,Rivers T.2001.Chromium and manganese zoning in pelitic garnet and kyanite:Spiral,overprint,and oscillatory zoning patterns and the role of growth rate.Journal of Metamorphic Geology,19(4):455-474
Zhao G P,Liu S W,Liu X H.2004.Compositional distribution and growth mode of garnet porphyroblasts during deformation and metamorphism.Acta Geologica Sinica,78(1):186-190
陈亚平,魏春景,张晋瑞,初航.2014.内蒙古中西部地区宝音图群变质作用和年代学研究.见:2014年中国地球科学联合学术年会---专题45:中亚-兴蒙造山带论文集.北京:中国地球物理学会
核工业208地质大队.2005.内蒙古自治区巴彦淖尔市特默特等五幅1:5万区域矿产地质调查成果报告.20
黄雄南,张家声,彭澎,李天斌.2013.贺兰山北段古元古代结晶基底变形特征及其区域构造意义.岩石学报,29(7):2353-2370
邵济安,张履桥.1990.兴蒙造山带中的古地体.见:中国地质学会构造地质专业委员会编.造山带·盆地·环太平洋构造国际大陆岩石圈构造演化与动力学讨论会第三届全国构造会议论文集.北京:地质出版社,16-21
邵济安.1995.中国东北地体与东北亚大陆边缘演化.北京:地震出版社,30-33
沈存利,陈志勇,常忠耀.2004.内蒙古“宝音图隆起”的归属讨论.地质调查与研究,27(1):18-23
孙立新,赵凤清,王惠初,任邦方,彭树华,滕飞.2013.内蒙古狼山地区宝音图地块变质基底的锆石U-Pb年龄及构造意义.地质学报,87(2):197-207
滕学建.2016.内蒙古狼山霍各其地区前中生代构造变形特征研究.硕士学位论文.北京:中国地质大学(北京),1-3
王曰倫,任富根.1962.变质岩系中假砾岩层的成因和辨别方法.中国地质,12(7):5-10
魏春景.2 012.21世纪最初十年变质岩石学研究进展.矿物岩石地球化学通报,31(5):415-427
辛江.2013.内蒙古东南部多金属成矿系列与找矿模型.博士学位论文.北京:中国地质大学(北京),7-8
徐备,刘树文,王长秋,郑海飞,田峰.2000.内蒙古西北部宝音图群Sm-Nd和Rb-Sr地质年代学研究.地质论评,46(1):86-90
张玉清,苏宏伟.2002.内蒙古宝音图岩群变质基性火山岩锆石U-Pb年龄及意义.地质调查与研究,25(3-4):199-204,213
张玉清.2004.内蒙古白云鄂博北部宝音图岩群变质基性火山岩的年龄、构造背景及地质意义.地质通报,23(2):177-183
Bell T H,Johnson S E.1989.Porphyroblast inclusion trails:The key to orogenesis.Journal of Metamorphic Geology,7(3):279-310
Caddick M J,Konopásek J,Thompson A B.2010.Preservation of garnet growth zoning and the duration of prograde metamorphism.Journal of Petrology,51(11):2327-2347
Carlson W D,Denison C.1992.Mechanisms of porphyroblast crystallization:Results from high-resolution computed X-ray tomography.Science,257(5074):1236-1239
Carlson W D,Denison C,Ketcham R A.1995.Controls on the nucleation and growth of porphyroblasts:Kinetics from natural textures and numerical models.Geological Journal,30(3-4):207-225
Carlson W D,Pattison D R M,Caddick M J.2015.Beyond the equilibrium paradigm:How consideration of kinetics enhances metamorphic interpretation.American Mineralogist,100(8-9):1659-1667
Coggon R,Holland T J B.2002.Mixing properties of phengitic micas and revised garnet-phengitethermobarometers.Journal of Metamorphic Geology,20(7):683-696
Daniel C G,Spear F S.1998.Three-dimensional patterns of garnet nucleation and growth.Geology,26(6):503-506
Daniel C G,Spear F S.1999.The clustered nucleation and growth processes of garnet in regional metamorphic rocks from north-west Connecticut,USA.Journal of Metamorphic Geology,17(5):503-520
deCapitani C,Brown T H.1987.The computation of chemical equilibrium in complex systems containing non-ideal solutions.Geochimica et Cosmochimica Acta,51(10):2639-2652
Dempster T J,Symon S,Chung P.2017.Intergranular diffusion rates from the analysis of garnet surfaces:Implications for metamorphic equilibration.Journal of Metamorphic Geology,35(6):585-600
Enami,M.2010.Pressure-temperature path of sanbagawaprograde metamorphism deduced from grossular zoning of garnet.Journal of Metamorphic Geology,16(1),97-106
Farber K,Caddick M J,John T.2014.Controls on solid-phase inclusion during porphyroblast growth:Insights from the Barrovian sequence(Scottish Dalradian).Contributions to Mineralogy and Petrology,168(6):1089
Holdaway M J.2001.Recalibration of the GASP geobarometer in light of recent garnet and plagioclase activity models and versions of the garnet-biotitegeothermometer.American Mineralogist,86(10):1117-1129
Holland T,Baker J,Powell R.1998.Mixing properties and activitycomposition relationships of chlorites in the system Mg O-FeO-Al2O3-SiO2-H2O.European Journal of Mineralogy,10(3):395-406.
Holland T,Powell R.2003.Activity-composition relations for phases in petrological calculations:An asymmetric multicomponent formulation.Contributions to Mineralogy and Petrology,145(4):492-501
Kohn M J,Spear F.2000.Retrograde net transfer reaction insurance for pressure-temperature estimates.Geology,28(12):1127-1130
Kohn M J.2003.Geochemical zoning in metamorphic minerals.Treatise on Geochemistry,3:229-261
Kretz R.1993.A garnet population in Yellowknife schist,Canada.Journal of Metamorphic Geology,11(1):101-120
Kruhl J H,Erdmann S,Büttner S H.2007.Brittle-ductile microfabrics in naturally deformed cordierite:Evidence for significant short-term strain-rate variations.Journal of Structural Geology,29(2):355-374
Lawther S E M,Dempster T J.2009.Apatite grain boundary morphology and its response to low-temperature fluid infiltration in crystalline basement.Geofluids,9(3):224-236
Moynihan D P,Pattison D R M.2013.An automated method for the calculation of p-t paths from garnet zoning,with application to metapelitic schist from the Kootenay Arc,British Columbia,Canada.Journal of Metamorphic Geology,31(5):525-548
Miyazaki,K.2015.Diffusion-controlled growth and degree of disequilibrium of garnet porphyroblasts:is diffusion-controlled growth of porphyroblasts common?Progress in Earth&Planetary Science,2(1),1-14.
Prior D J.1987.Syntectonicporphyroblast growth in phyllites:Textures and processes.Journal of Metamorphic Geology,5(1):27-39
Putnis A,John T.2010.Replacement processes in the Earth's Crust.Elements,6(3):159-164
Reed S J B.2005.Electron Microprobe Analysis and Scanning Electron Microscopy in Geology.2nd.Cambridge:Cambridge University Press,206
Robyr M,Darbellay B,Baumgartner L P.2014.Matrix-dependent garnet growth in polymetamorphic rocks of the Sesia zone,Italian Alps.Journal of Metamorphic Geology,32(1):3-24
Spear F S,Kohn M J,Florence F P.1990.A model for garnet and plagioclase growth in peliticschists:Implications for thermobarometry and P-T path determinations.Journal of Metamorphic Geology,8(6):683-696
Spear F S.1991.On the interpretation of peak metamorphic temperatures in light of garnet diffusion during cooling.Journal of Metamorphic Geology,9(4):379-388
Spear F S.2014.The duration of near-peak metamorphism from diffusion modelling of garnet zoning.Journal of Metamorphic Geology,32(8):903-914
Theye T,Schreyer W,Fransolet A M.1996.Low-temperature,low-pressure metamorphism of Mn-rich rocks in the lienne syncline,VennStavelot Massif(Belgian Ardennes),and the role of carpholite.Journal of Petrology,37(4):767-783
Vance D,O'Nions R K.1990.Isotopic chronometry of zoned garnets:Growth kinetics and metamorphic histories.Earth and Planetary Science Letters,97(3-4):227-240
Vernon R H,White R W,Clarke G L.2008.False metamorphic events inferred from misinterpretation of microstructural evidence and p-t data.Journal of Metamorphic Geology,26(4):437-449
Viete D R,Hermann J,Lister G S,Stenhouse L R.2011.The nature and origin of the Barrovian metamorphism,Scotland:Diffusion length scales in garnet and inferred thermal time scales.Journal of the Geological Society,168(1):115-132
White R W,Pomroy N E,Powell R.2005.An in situ metatexite-diatexite transition in upper amphibolite facies rocks from Broken Hill,Australia.Journal of Metamorphic Geology,23(7):579-602
White R W,Powell R,Holland T J B.2010.Progress relating to calculation of partial melting equilibria for metapelites.Journal of Metamorphic Geology,25(5):511-527.
Whitney D L,Seaton N C A.2010.Garnet polycrystals and the significance of clustered crystallization.Contributions to Mineralogy and Petrology,160(4):591-607
Wintsch R P,Aleinikoff J N,Yi K.2005.Foliation development and reaction softening by dissolution and precipitation in the transformation of granodiorite to orthogneiss,Glastonbury Complex,Connecticut,U.S.A.Canadian Mineralogist,43(1):327-347
Yang P,Rivers T.2001.Chromium and manganese zoning in pelitic garnet and kyanite:Spiral,overprint,and oscillatory zoning patterns and the role of growth rate.Journal of Metamorphic Geology,19(4):455-474
Zhao G P,Liu S W,Liu X H.2004.Compositional distribution and growth mode of garnet porphyroblasts during deformation and metamorphism.Acta Geologica Sinica,78(1):186-190
陈亚平,魏春景,张晋瑞,初航.2014.内蒙古中西部地区宝音图群变质作用和年代学研究.见:2014年中国地球科学联合学术年会---专题45:中亚-兴蒙造山带论文集.北京:中国地球物理学会
核工业208地质大队.2005.内蒙古自治区巴彦淖尔市特默特等五幅1:5万区域矿产地质调查成果报告.20
黄雄南,张家声,彭澎,李天斌.2013.贺兰山北段古元古代结晶基底变形特征及其区域构造意义.岩石学报,29(7):2353-2370
邵济安,张履桥.1990.兴蒙造山带中的古地体.见:中国地质学会构造地质专业委员会编.造山带·盆地·环太平洋构造国际大陆岩石圈构造演化与动力学讨论会第三届全国构造会议论文集.北京:地质出版社,16-21
邵济安.1995.中国东北地体与东北亚大陆边缘演化.北京:地震出版社,30-33
沈存利,陈志勇,常忠耀.2004.内蒙古“宝音图隆起”的归属讨论.地质调查与研究,27(1):18-23
孙立新,赵凤清,王惠初,任邦方,彭树华,滕飞.2013.内蒙古狼山地区宝音图地块变质基底的锆石U-Pb年龄及构造意义.地质学报,87(2):197-207
滕学建.2016.内蒙古狼山霍各其地区前中生代构造变形特征研究.硕士学位论文.北京:中国地质大学(北京),1-3
王曰倫,任富根.1962.变质岩系中假砾岩层的成因和辨别方法.中国地质,12(7):5-10
魏春景.2 012.21世纪最初十年变质岩石学研究进展.矿物岩石地球化学通报,31(5):415-427
辛江.2013.内蒙古东南部多金属成矿系列与找矿模型.博士学位论文.北京:中国地质大学(北京),7-8
徐备,刘树文,王长秋,郑海飞,田峰.2000.内蒙古西北部宝音图群Sm-Nd和Rb-Sr地质年代学研究.地质论评,46(1):86-90
张玉清,苏宏伟.2002.内蒙古宝音图岩群变质基性火山岩锆石U-Pb年龄及意义.地质调查与研究,25(3-4):199-204,213
张玉清.2004.内蒙古白云鄂博北部宝音图岩群变质基性火山岩的年龄、构造背景及地质意义.地质通报,23(2):177-183