滇西澜沧谦迈地区榴辉岩岩石学、矿物学特征及变质演化p-T轨迹
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摘要
澜沧谦迈地区位于西南三江昌宁-孟连结合带中段。新近在该地区发现榴辉岩,与双江县勐库地区退变榴辉岩一样,谦迈地区榴辉岩也产于湾河蛇绿混杂岩带内,岩石新鲜,后期退变质作用改造弱,岩石学信息保留完整。主要矿物成分为石榴子石、绿辉石、多硅白云母、金红石、角闪石、绿帘石、石英等,直接围岩为白云(钠长)片岩和斜长角闪岩,白云(钠长)片岩主要由多硅白云母、石英和长石构成。根据岩石学和矿物学特征将谦迈地区榴辉岩划分为4个变质阶段,其中峰期矿物组合为石榴子石+绿辉石+多硅白云母+硬柱石+蓝闪石+金红石+石英。初步研究表明,峰期榴辉岩相变质温度和压力分别为600℃和2.5GPa。新发现的榴辉岩为研究三江地区特提斯构造演化提供了关键性资料,该榴辉岩变质演化p-T轨迹的研究对探讨古特提斯洋的俯冲-造山过程具有重要意义。
Eclogite was newly discovered in the Qianmai area within the Changning-Menglian suture zone in the Sangjiang area,southwest China. Qianmai eclogites, like retrograded eclogites in the Mengku area of Shuangjiang County, occur within the Wanhe ophiolitic mélange. The studied eclogites are fresh with weak retrogression. The main mineral compositions include garnet,omphacite, phengite, rutile, amphibole, epidote and quartz. The surrounding rocks include muscovite(albite) schist and plagioclase amphibolite. The muscovite(albite) schist is mainly composed of phengite, quartz and feldspar. Four-stage metamorphic evolution was identified in according to the petrological and mineralogical analyses. The peak mineral association includes garnet+omphacite+phengite+ lawsonite+glaucophane+rutile+quartz. The peak eclogite-facies metamorphic temperature and pressure are 600°C and2.5 GPa, respectively. The newly discovered eclogite provides important information for the study of the Tethyan tectonic evolution in Sanjiang region. The metamorphic p-T path of the eclogites is of great significance for investigating the subduction-orogeny process of the Paleo-Tethys Ocean.
Eclogite was newly discovered in the Qianmai area within the Changning-Menglian suture zone in the Sangjiang area,southwest China. Qianmai eclogites, like retrograded eclogites in the Mengku area of Shuangjiang County, occur within the Wanhe ophiolitic mélange. The studied eclogites are fresh with weak retrogression. The main mineral compositions include garnet,omphacite, phengite, rutile, amphibole, epidote and quartz. The surrounding rocks include muscovite(albite) schist and plagioclase amphibolite. The muscovite(albite) schist is mainly composed of phengite, quartz and feldspar. Four-stage metamorphic evolution was identified in according to the petrological and mineralogical analyses. The peak mineral association includes garnet+omphacite+phengite+ lawsonite+glaucophane+rutile+quartz. The peak eclogite-facies metamorphic temperature and pressure are 600°C and2.5 GPa, respectively. The newly discovered eclogite provides important information for the study of the Tethyan tectonic evolution in Sanjiang region. The metamorphic p-T path of the eclogites is of great significance for investigating the subduction-orogeny process of the Paleo-Tethys Ocean.
引文
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①云南省地质调查院. 1∶25万澜沧县、勐海县幅区域地质调查报告. 2012.
[2]钟大赉.滇川西部古特提斯造山带[M].北京:科学出版社, 1998:1-231.
[3]Fang N Q, Liu B P, Feng Q L, et al. Late Palaeozoic and Triassic deep-water deposits and tectonic evolution of the Palaeotethys in the Changning-Menglian and Lancangjiang belts, southwestern Yunnan[J]. Journal of Southeast Asian Earth Sciences, 1994, 9(4):363-374.
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[5]潘桂棠,徐强,侯增谦,等.西南“三江”多岛弧造山过程、成矿系统与资源评价[M].北京:地质出版社, 2003.
[6]李文昌,潘桂棠,侯增谦,等.西南“三江”多岛弧盆-碰撞造山成矿理论与勘查技术[M].北京:地质出版社, 2010.
[7]Metcalfe I. Gondwana dispersion and Asian accretion:Tectonic and palaeogeographic evolution of eastern Tethys[J]. Journal of Asian Earth Sciences, 2013, 66:1-33.
[8]Masatoshi S, Metcalfe I. Parallel Tettyan Sutures in mainland SE Asia:new issights for Palaeo-Tethys closure[J]. Comptes Rendus Geoscience, 2008, 340(2/3):166-179.
[9]Burchfiel B C, Chen Z L. Tectonics of the Southeastern Tibetan plateau and Its Adjacent Foreland[J]. Boulder, Colorado:Geological Society of America, 2013,210:1-64.
[10]段向东,张志斌,冯庆来,等.滇西南耿马弄巴地区南皮河组层型剖面地层层序、时代的重新认识[J].地层学杂志, 2003, 27(1):59-65.
[11]段向东,李静,曾文涛,等.昌宁-孟连中段干龙塘构造混杂岩的发现[J].云南地质, 2006, 25(1):53-62.
[12]张凡,冯庆来,段向东,等.滇西南昌宁-孟连构造带西带研究初探——以耿马弄巴剖面为例[J].地质科技情报, 2006, 25(3):13-20.
[13]杨文强,冯庆来,段向东,等.滇西南昌宁-孟连构造带晚泥盆世枕状玄武岩和硅质岩的特征[J].地质通报, 2007, 26(6):739-747.
[14]李静.云南省双江县牛井山蛇绿混杂岩的岩石学研究[D].昆明理工大学硕士学位论文, 2004.
[15]赖绍聪,秦江峰,李学军,等.昌宁-孟连缝合带干龙塘-弄巴蛇绿岩地球化学及Sr-Nd-Pb同位素组成研究[J].岩石学报,2010, 26(11):3195-3195.
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[17]王保弟,王立全,王冬兵,等.三江昌宁-孟连带原-古特提斯构造演化[J].地球科学, 2018, 43(8):2527-2550.
[18]Nie X M, Feng Q L, Qian X, et al. Magmatic record of Prototethyan evolution in SWYunnan, China:Geochemical,zircon U-Pb geochronological and Lu-Hf isotopic evidence from the Huimin metavolcanicrocks in the southern Lancangjiang zone[J].Gondwana Research, 2015, 28(2):757-768.
[19]Xing X W, Wang Y J, Cawood P A, et al. Early Paleozoic accretionary orogenesis along northern margin of Gondwana constrained by high-Mg metaigneous rocks, SW Yunnan[J].Internation Journal of Earth Sciences, 2017, 106(5):1469-1486.
[20]王冬兵,罗亮,唐渊,等.昌宁-孟连结合带牛井山早古生代埃达克岩锆石U-Pb年龄、岩石成因及其地质意义[J].岩石学报,2016, 32(8):2317-2329.
[21]王冬兵,罗亮,唐渊,等.昌宁-孟连结合带斜长角闪岩锆石UPb年龄、地球化学特征及其地质意义[J].沉积与特提斯地质,2017, 37(4):17-28.
[22]刘桂春,孙载波,曾文涛,等.滇西双江县勐库地区湾河蛇绿混杂岩的厘定、地球化学特征及其地质意义[J].岩石矿物学杂志,2017, 36(2):163-174.
[23]孙载波,曾文涛,周坤,等.昌宁-孟连结合带奥陶纪洋岛玄武岩的识别及其构造意义——来自地球化学和锆石U-Pb年龄的证据[J],地质通报, 2017, 36(10):1760-1772.
[24]毛晓长.保山-镇康地块及邻区早古生代地质特征及特提斯构造演化[D].中国地质大学(北京)博士学位论文, 2016.
[25]彭智敏,张辑,关俊雷,等.滇西“三江”地区临沧花岗岩基早—中奥陶世花岗质片麻岩的发现及意义[J].地球科学, 2018,43(8):2571-2582.
[26]李静,孙载波,徐桂香,等.滇西双江县勐库地区榴闪岩的发现与厘定[J].矿物学报, 2015, 35(4):421-424.
[27]李静,孙载波,黄亮,等.滇西勐库退变质榴辉岩的p-T-t轨迹及地质意义[J].岩石学报, 2017, 33(7):2285-2291.
[28]徐桂香,曾文涛,孙载波,等.滇西双江县勐库地区(退变质)榴辉岩的岩石学、矿物学特征[J].地质通报, 2016, 35(7):1036-1045.
[29]陈光艳,徐桂香,孙载波,等.滇西双江县勐库地区退变质榴辉岩中闪石类矿物的成因研究[J].岩石矿物学杂志, 2017, 36(1):36-47.
[30]孙载波,李静,周坤,等.滇西双江县勐库地区退变质榴辉岩的岩石地球化学特征及其地质意义[J].岩石矿物学杂志, 2017, 31(4):746-756.
[31]孙载波,李静,周坤,等.滇西双江县勐库地区退变质榴辉岩的锆石U-Pb年代学及其地质意义[J].地质通报, 2018, 37(11):2032-2043.
[32]Wang H N, Liu F L, Li J, et al. Petrology, geochemistry and p-T-t path of lawsonite bearing ecloites in the ChangningMengkian orogenic belt, southeast Tibetan Plateau[J]. Journal of Metamorphic Geology, 2018, 290:32-48.
[33]沈其韩.推荐一个系统的矿物缩写表[J].岩石矿物学杂志, 2009,28(5):495-500.
[34]Whitney D L, Evans B W. Abbreviations for nanmes of rockforming minerals[J]. American Mineralogist, 2010, 95(1):185-187.
[35]Coleman R G, Lee D E, Beatty L B, et al. Eclogites:their difference and similarities[J]. Geological Society America Bulletin,1965, 76:483-508.
[36]Morimoto N. Nomenclature of pyroxense[J]. Mineralogical Magazine, 1988, 52:535-550.
[37]Clarke G L, Aitchison J C, Cluzel D. Eclogites and blueschists of Pam Penisula, NE New Caledonia:a reappraisal[J]. Journal of Petrology, 1997, 38:843-876.
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①云南省地质调查院. 1∶25万澜沧县、勐海县幅区域地质调查报告. 2012.