滇西点苍山变质杂岩中叠加低温糜棱岩的变形-变质、流体及地质意义
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摘要
点苍山变质杂岩是发育在哀牢山-红河走滑断层带上的四个变质杂岩体之一,其遭受了多阶段的变质-变形改造,特别是自晚渐新世以来其深变质岩石广泛遭受了高温韧性剪切变形及从地壳深部剥露到地表过程.本文在前人研究成果及详细的野外地质观测的基础上,对新生代点苍山杂岩的深变质岩石变形-变质作用和剥露过程开展了相关研究,尤其是重点针对叠加低温糜棱岩开展了详细的研究.其中通过光学显微镜、扫描电子显微镜的附件电子背散射衍射以及结合阴极发光技术方法和手段,开展了叠加低温糜棱岩的显微构造、变形矿物晶格优选定向以及矿物相的深入分析.研究结果表明:(1)点苍山深变质杂岩经历了早期的高温左行剪切变形以及晚期的伸展快速剥露过程,其低温变形-变质构造特征和矿物组合叠加在早期的高温变形-变质基础之上,且高温显微构造和组构部分或全部遭受晚期叠加低温剪切变形作用改造;(2)叠加低温变形-变质出现在韧-脆性转换过程中;(3)同构造剪切叠加低温变形-变质过程中的流体非常活跃,以及伴随由动态重结晶作用和/或伴随的破裂-微破裂作用导致岩石中主要组成矿物强烈细粒化,并进一步致使变形应变局部化(如微剪切带发育),其常常伴随着岩石强度的降低,并在进一步的演变过程中影响着岩石的整体流变性.
引文
曹淑云.2007.滇西点苍山高温糜棱岩显微构造和流动机制研究.硕士学位论文.北京:中国地质大学.1-113
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季建清,钟大赉,张连生.2000.滇西南新生代走滑断裂运动学、年代学、及对青藏高原东南部块体运动的意义.地质科学,35336-349
刘俊来,曹淑云,翟云峰,宋志杰,王安建,修群业,曹殿华,高兰,管烨.2007.用陆块旋转解释藏东南渐新世-中新世伸展作用--来自点苍山及邻区变质核杂岩的证据.地学前缘,14:40-48
刘俊来,曹淑云,邹运鑫,宋志杰.2008.岩石电子背散射衍射(EBSD)组构分析及应用.地质通报,27:1638-1645
王勇生,杨秉飞,王海峰,余顶杰.2016.石英C轴组构影响因素探讨:以郯庐断裂带糜棱岩为例.岩石学报,32:965-975
夏浩然,刘俊来.2011.石英结晶学优选与应用.地质通报,30:58-70
张波,张进江,钟大赉,郭磊.2008.滇西澜沧江左旋走滑挤压带应变分解的应变和运动学涡度证据.中国科学D辑:地球科学,1268-1283
张进江,张波.2006.哀牢山-红河构造带古新世以来多期活动的构造和年代学证据.地质科学,41:291-310
张进江,钟大赉,季建清,丁林,桑海清.2001.东喜马拉雅构造结:大陆碰撞以来构造年代学框架及其与哀牢山-红河构造带的对比.矿物岩石地球化学通报,20:243-244
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季建清,钟大赉,张连生.2000.滇西南新生代走滑断裂运动学、年代学、及对青藏高原东南部块体运动的意义.地质科学,35336-349
刘俊来,曹淑云,翟云峰,宋志杰,王安建,修群业,曹殿华,高兰,管烨.2007.用陆块旋转解释藏东南渐新世-中新世伸展作用--来自点苍山及邻区变质核杂岩的证据.地学前缘,14:40-48
刘俊来,曹淑云,邹运鑫,宋志杰.2008.岩石电子背散射衍射(EBSD)组构分析及应用.地质通报,27:1638-1645
王勇生,杨秉飞,王海峰,余顶杰.2016.石英C轴组构影响因素探讨:以郯庐断裂带糜棱岩为例.岩石学报,32:965-975
夏浩然,刘俊来.2011.石英结晶学优选与应用.地质通报,30:58-70
张波,张进江,钟大赉,郭磊.2008.滇西澜沧江左旋走滑挤压带应变分解的应变和运动学涡度证据.中国科学D辑:地球科学,1268-1283
张进江,张波.2006.哀牢山-红河构造带古新世以来多期活动的构造和年代学证据.地质科学,41:291-310
张进江,钟大赉,季建清,丁林,桑海清.2001.东喜马拉雅构造结:大陆碰撞以来构造年代学框架及其与哀牢山-红河构造带的对比.矿物岩石地球化学通报,20:243-244
张连生,钟大赉.1996.从红河剪切带走滑运动看东亚大陆新生代构造.地质科学,327-341
Burchfiel B C,Wang E.2003.Northwest-trending,middle Cenozoic,left-lateral faults in southern Yunnan,China,and their tectonic significance.J Struct Geol,25:781-792
Barr S M,Macdonald A S,Miller B V,Reynolds P H,Rhodes B P,Yokart B.2002.New U-Pb and40Ar/39Ar ages from the Doi Inthanon and Doi Suthep metamorphic core complexes,northwestern Thailand.Bangkok:Symposium on Geology of Thailand.284-294
Bertrand G,Rangin C.2003.Tectonics of the western margin of the Shan plateau(central Myanmar):Implication for the India-Indochina oblique convergence since the Oligocene.J Asian Earth Sci,21:1139-1157
Cao S Y,Liu J L,Hu L.2007.Micro-and submicrostructural evidence for high-temperature brittle-ductile transition deformation of hornblende:Case study of high-grade mylonites from Diancangshan,western Yunnan.Sci China Ser D:Earth Sci,50:1459-1470
Cao S Y,Liu J L,Bernd L,Axel V,Zou Y X,Zhao C Q.2009.Timing of initiation of left-lateral slip along the Ailao Shan-Red River shear zone:microstructural,texture and thermochronological evidence from high temperature mylonites in Diancang Shan,SW China.Acta Geol Sin,83:1388-1400
Cao S Y,Liu J L,Leiss B,Zhao C Q.2010a.New zircon U-Pb geochronology of the post-kinematic granitic plutons in the Diancang Shan metamorphic massif along the Ailao Shan-Red River shear zone and its geological implications.Acta Geol Sin,84:1474-1487
Cao S,Liu J,Leiss B.2010b.Orientation-related deformation mechanisms of naturally deformed amphibole in amphibolite mylonites from the Diancang Shan,SW Yunnan,China.J Struct Geol,32:606-622
Cao S,Liu J,Leiss B,Neubauer F,Genser J,Zhao C.2011a.OligoMiocene shearing along the Ailao Shan-Red River shear zone Constraints from structural analysis and zircon U/Pb geochronology of magmatic rocks in the Diancang Shan massif,SE Tibet,China Gondwana Res,19:975-993
Cao S,Neubauer F,Liu J,Genser J,Leiss B.2011b.Exhumation of the Diancang Shan metamorphic complex along the Ailao Shan-Red River belt,southwestern Yunnan,China:Evidence from40Ar/39Ar thermochronology.J Asian Earth Sci,42:525-550
Cao S,Liu J,Leiss B,Vollbrecht A,Genser J,Neubauer F,Zhao C2012.Initiation of left-lateral deformation along the Ailao ShanRed River shear zone:new microstructural,textural,and geochronological constraints from the Diancang Shan metamorphic massif SW Yunnan,China.Int Geol Rev,54:348-367
Cao S,Neubauer F.2016.Deep crustal expressions of exhumed strikeslip fault systems:Shear zone initiation on rheological boundaries Earth-Sci Rev,162:155-176
Cao S,Neubauer F,Bernroider M,Genser J,Liu J,Friedl G.2017Low-grade retrogression of a high-temperature metamorphic core complex:Naxos,Cyclades,Greece.Geol Soc Am Bull,129:93-117
Chen X Y,Liu J L,Weng S T.2016.Deformation characteristics and cenozoic exhumation of the Yao Shan complex evidenced by apatite fission track thermochronology.Acta Petrol Sin,32:2303-2316
Chung S L,Lo C H,Lee T Y,Zhang Y,Xie Y,Li X,Wang K L,Wang P L.1998.Diachronous uplift of the Tibetan plateau starting 40 Myr ago.Nature,394:769-773
England P,Molnar P.1990.Right-lateral shear and rotation as the explanation for strike-slip faulting in eastern Tibet.Nature,344140-142
Faghih A,Soleimani M.2015.Quartz c-axis fabric developmen associated with shear deformation along an extensional detachmen shear zone:Chapedony Metamorphic Core Complex,Central-Eas Iranian Microcontinent.J Struct Geol,70:1-11
Gilley L D,Harrison T M,Leloup P H,Ryerson F J,Lovera O M,Wang J H.2003.Direct dating of left-lateral deformation along the Red River shear zone,China and Vietnam.J Geophys Res,108:2127
Handy M R.1989.Deformation regimes and the rheological evolution of fault zones in the lithosphere:The effects of pressure temperature,grainsize and time.Tectonophysics,163:119-152
Handy M R.,Hirth G,Bürgmann R.2007.Continental fault structure and rheology from the frictional to viscous transition downward.In Handy M R.Hirt G,Hovius N,eds.Tectonic Faults:Agents of Change on a Dynamic Earth.Cambridge:MIT Press.139-182
Harrison T M,Wenji C,Leloup P H,Ryerson F J,Tapponnier P.1992An early Miocene transition in deformation regime within the Red River Fault zone,Yunnan,and its significance for Indo-Asian tectonics.J Geophys Res,97:7159-7182
Harrison T M,Leloup P H,Ryerson F J,Tapponnier P,Lacassin R,Chen W J.1996.Diachronous initiation of transtension along the Ailao Shan-Red River shear zone,Yunnan and Vietnam.In:Yin A,Harrison T M,eds.The Tectonic Evolution of Asia.Cambridge:Cambridge University Press.208-225
Harrison T M,Ryerson F J,Le Fort P,Yin A,Lovera O M,Catlos E J.1997.A late Miocene-Pliocene origin for the central Himalayan inverted metamorphism.Earth Planet Sci Lett,146:E1-E7
Law R D.2014.Deformation thermometry based on quartz c-axis fabrics and recrystallization microstructures:A review.J Struct Geol,66:129-161
Leloup P H,Lacassin R,Tapponnier P,Sch?rer U,Zhong D,Liu X,Zhang L,Ji S,Trinh P T.1995.The Ailao Shan-Red River shear zone(Yunnan,China),Tertiary transform boundary of Indochina.Tectonophysics,251:3-84
Leloup P H,Arnaud N,Lacassin R,Kienast J R,Harrison T M,Trong TT P,Replumaz A,Tapponnier P.2001.New constraints on the structure,thermochronology,and timing of the Ailao Shan-Red River shear zone,SE Asia.J Geophys Res,106:6683-6732
Leloup P H,Tapponnier P,Lacassin R,Searle M P.2007.Discussion on the role of the Red River shear zone,Yunnan and Vietnam.J Geol Soc,164:1253-1260
Liu J L,Song Z J,Cao S Y,Zhai Y F,Wang A J,Gao L,Xiu Q Y,Cao DH.2006.The dynamic setting and processes of tectonic and magmatic evolution of the oblique collision zone between Indian and Eurasian plates:exemplified by the tectonic evolution of the Three River region,eastern Tibet.Acta Petrol Sin,22:775-786
Liu J,Cao S,Zhai Y,Song Z,Wang A,Xiu Q,Cao D,Gao L,Guan Y.2007.Rotation of crustal blocks as an Explanation of OligoMiocene Extension in Southeastern Tibet-Evidenced by the Diancangshan and Nearby metamorphic core complexes(in Chinese).Earth Sci Front,14:40-48
Liu J,Tang Y,Tran M D,Cao S,Zhao L,Zhang Z,Zhao Z,Chen W.2012.The nature of the Ailao Shan-Red River(ASRR)shear zone:Constraints from structural,microstructural and fabric analyses of metamorphic rocks from the Diancang Shan,Ailao Shan and Day Nui Con Voi massifs.J Asian Earth Sci,47:231-251
Maluski H,Lepvrier C,Jolivet L,Carter A,Roques D,Beyssac O,Tang T T,Thang N D,Avigad D.2001.Ar-Ar and fission-track ages in the Song Chay Massif:Early Triassic and Cenozoic tectonics in northern Vietnam.J Asian Earth Sci,19:233-248
Nam T N,Toriumi M,Itaya T.1998.P-T-t paths and post-metamorphic exhumation of the Day Nui Con Voi shear zone in Vietnam.Tectonophysics,290:299-318
Passchier C W,Trouw R A J.2005.Microtectonics.Berlin-Heidelberg Springer.105-109
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