吉尔吉斯南天山Djanydjer蛇绿混杂岩地质特征及辉长岩年代学研究
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摘要
位于吉尔吉斯斯坦南天山缝合带附近的Djanydjer蛇绿混杂岩由蛇纹石化橄榄岩、辉长岩、玄武岩、硅质岩等组成。通过对辉长岩中锆石U-Pb年代学研究获得两组年龄:(422.0±2.0)Ma(MSWD=1.2),(397.3±3.9)Ma(MSWD=0.6)。结合境内外南天山蛇绿混杂岩的年代学特征,认为前者代表辉长岩的形成时代,表明分割吉尔吉斯斯坦中天山和塔里木克拉通的洋盆在晚志留世早期已经存在。由辉长岩中获得的中泥盆世年龄可能与洋壳闭合-蛇绿岩构造侵位或后期花岗质岩浆侵入作用相关。与Djanydjer蛇绿混杂岩产出于同一构造带上的变质沉积岩组合,一直以来被认为是前寒武纪的变质地体,文中对其中的白云母石英片岩的研究发现,其碎屑锆石记录了较宽的年龄范围(406~2 856 Ma)。通过与阿特巴什变质硬砂岩中的碎屑锆石和塔里木克拉通岩浆锆石的比较发现,白云母石英片岩与包裹榴辉岩的变质杂岩相似,原岩的沉积时代不早于早泥盆世,其部分物源可能来自吉尔吉斯中天山—北天山。
Djanydjer ophiolitic mélange in the Kyrgyzstan,South Tianshan suture are composed of serpentinized peridotite,gabbro,basalt and chert.Two groups U-Pb zircon ages of 422.0±2.0Ma(MSWD=1.2)and 397.3±3.9 Ma(MSWD=0.6)have obtained for the gabbro.Considered with chronology studies of ophiolites in China-Kyrgrz,South Tianshan,the older age(422Ma)represents the crystallization of gabbro,which implies the oceanic basin separated the Tarim craton and Kyrgyz Middle Tianshan terrane has existed in the early stage of the Late Silurian.The younger age might be related to metamorphism during the oceanic lithosphere obduction or the post-collisional magmatism.Muscovite-quartz schist in the same belt with Djanydjer ophiolitic mélange was considered as a part of Precambrian metamorphic terrane.It has similar petrology and deformation characteristics with the host rocks of Atbashi ecologite.Its detrital zircons vary widely in age from406 Ma to 2856 Ma,which is similar to that reported from the Atbashi greywacke.Compared with the age spectrum of zircons from Tarim Craton and Atbashi greywacke,the protolith of the muscovite-quartz schist has a depositional age<406 Ma and the provenance was probably in the North and Middle Tianshan.
Djanydjer ophiolitic mélange in the Kyrgyzstan,South Tianshan suture are composed of serpentinized peridotite,gabbro,basalt and chert.Two groups U-Pb zircon ages of 422.0±2.0Ma(MSWD=1.2)and 397.3±3.9 Ma(MSWD=0.6)have obtained for the gabbro.Considered with chronology studies of ophiolites in China-Kyrgrz,South Tianshan,the older age(422Ma)represents the crystallization of gabbro,which implies the oceanic basin separated the Tarim craton and Kyrgyz Middle Tianshan terrane has existed in the early stage of the Late Silurian.The younger age might be related to metamorphism during the oceanic lithosphere obduction or the post-collisional magmatism.Muscovite-quartz schist in the same belt with Djanydjer ophiolitic mélange was considered as a part of Precambrian metamorphic terrane.It has similar petrology and deformation characteristics with the host rocks of Atbashi ecologite.Its detrital zircons vary widely in age from406 Ma to 2856 Ma,which is similar to that reported from the Atbashi greywacke.Compared with the age spectrum of zircons from Tarim Craton and Atbashi greywacke,the protolith of the muscovite-quartz schist has a depositional age<406 Ma and the provenance was probably in the North and Middle Tianshan.
引文
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[25]Biske Yu S,Konopelko D L,Seltmann R.Geodynamics of late Paleozoic magmatism in the Tien Shan and its framework[J].Geotectonics,2013,47:291-309.
[26]Alekseev D V,Aristov V A,Degtyarev K E.The age and tectonic setting of volcanic and cherty sequences in the ophiolite complex of the Atbashe Ridge(Southern Tien Shan)[J].Doklady Earth Sciences,2007,413A:380-383.
[27]De Grave J,Glorie S,Busiov M M,et al.Thermo-tectonic history of the Issyk-Kul basement(Kyrgyz Northern Tien Shan,Central Asia)[J].Gondwana Research,2013,23:998-1020.
[28]Burtman V S.Nappes of the southern Tien Shan[J].Russian Journal of Earth Sciences,2008,10:ES1006.doi:10.2205/2007ES000223.
[29]Seltmann R,Konopelko D,Biske G,et al.Hercynian postcollisional magmatism in the context of Paleozoic magmatic evolution of the Tianshan orogenic belt[J].Journal of Asian Earth Sciences,2011,42:821-838.
[30]Xiao W J,Windley B F,Allen M B,et al.Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage[J].Gondwana Research,2013,23:1316-1341.
[31]Gao J,Long L,Klemd R,et al.Tectonic evolution of theSouth Tianshan orogen and adjacent regions,NW China:Geochemical and age constraints of granitoid rocks[J].International Journal of Earth Sciences,2009,98:1221-1238.
[32]Qian Q,Gao J,Klemd R,et al.Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen:Constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate,NW China[J].International Journal of Earth Sciences,2009,98:551-569.
[33]Windley B F,Alexeiev D,Xiao W J,et al.Tectonic models for accretion of the Central Asian Orogenic Belt[J].Journal of the Geological Society of London,2007,164:31-47.
[34]Burtman V S.The Tien Shan Early Paleozoic tectonics and geodynamics[J].Russian Journal of Earth Sciences,2006,8:ES3003.doi:10.2205/2006ES000202.
[35]Hegner E,Klemd R,Krner A,et al.Mineralogy ages and P-T conditions of late Paleozoic high-pressure eclogite and provenance of mélange sediments in the South Tianshan Orogen of Kyrgyzstan[J].American Journal of Science,2010,310:916-950.
[36]ЖуковЮВ,ЗахаровИЛ,БерезанскийАВ.геологическаякартакыргызскойреспублики,1∶500000[M].2008.
[37]Glorie S,Grave J D,Buslov M M,et al.Tectonic history of the Kyrgyz South Tien Shan(Atbashi-Inylchek)suture zone:The role of inherited structures during deformation-propagation[J].Tectonics,2011,30:TC6016.doi:10.1029/2011TC002949.
[38]Biske Y S,Zubtsov Y S,Porshnyakov G S.Hercynides of the Atbashi-Kokshaal Region of the Southern Tian-Shan[M].Leningrad,Russia,Leningrad State University Publishing,1985:190(in Russian).
[39]Lu S,Li H,Zhang C,et al.Geological and geochronological evidence for the Precambrian evolution of the Tarim craton and surrounding continental fragments[J].Precambrian Research,2008,160:94-107.
[40]李忠,高剑,郭春涛,等.塔里木块体北部泥盆—石炭纪陆缘构造演化:盆地充填序列与物源体系约束[J].地学前缘,2015,22:35-52.
[41]常健,邱楠生,李佳蔚.塔里木盆地与南天山的耦合关系:来自(U-Th)/He年龄的新证据[J].地学前缘,2012,19:234-243.
[42]汤良杰,邱海峻,云露等.塔里木盆地北缘—南天山造山带盆-山耦合和构造转换[J].地学前缘,2012,19:195-204.
[43]Solomovich L I,Trifonov B A.Postcollisional granites in the South Tien Shan Variscan collisional belt,Kyrgyzstan[J].Journal of Asian Earth Sciences,2002,21:7-21.
[44]Konopelko D,Biske G,Seltmann M,et al.Deciphering Caledonian events:Timing and geochemistry of the Caledonian magmatic arc in the Kyrgyz Tien Shan[J].Journal of Asian Earth Sciences,2008,32:131-141.
[45]Agramonte Y R,Kroner A,Alexeiev D V,et al.Detrital and igneous zircon ages for supracrustal rocks of the Kyrgyz Tianshan and palaeogeographic implications[J].Gondwana Research,2014,26:957-974.
[2]Han B F,He G Q,Wang X C,et al.Late Carboniferous collision between the Tarim and Kazakhstan-Yili terranes in the western segment of the South Tian Shan Orogen,Central Asia,and implications for the Northern Xinjiang,western China[J].Earth-Science Reviews,2011,109:74-93.
[3]Charvet J,Shu L S,Laurent-Charvet S,et al.Palaeozoic tectonic evolutions of the Tianshan belt,NW China[J].Science in China Series D:Earth Sciences,2011,54:166-184.
[4]Wilhem C,Windley B F,Stampfi G M.The Altaids of Central Asia:A tectonic and evolutionary innovative review[J].Earth-Science Reviews,2012,113:303-341.
[5]Xiao W J,Santosh M.The western Central Asian Orogenic Belt:A window to accretionary orogenesis and continental growth[J].Gondwana Research,2014,25:1429-1444.
[6]Laurent-Charvet S,Charvet J,MoniéP,et al.Late Paleozoic strike-slip shear zones in eastern Central Asia(NW China):New structural and geochronological data[J].Tectonics,2003,22:1099-1101.
[7]Laurent-Charvet S,Charvet J,Shu L S,et al.Palaeozoic late collisional strike-slip deformations in Tianshan and Altay,eastern Xinjiang,NW China[J].Terra Nova,2002,14:249-256.
[8]Charreau J,Chen Y,Gilder S,et al.Magnetostratigraphy and rock magnetism of the Neogene Kuitun He section(northwest China):Implications for Late Cenozoic uplift of the Tianshan mountains[J].Earth and Planetary Science Letters,2005,230:177-192.
[9]Charreau J,Gilder S,Chen Y,et al.Magnetostratigraphy of the Yaha section,Tarim Basin(China):11 Ma acceleration in erosion and uplift of the Tianshan Mountains[J].Geology,2006,34:181-184.
[10]De Grave J,Buslov M M,Van den haute P,et al.Distant effects of India-Eurasia convergence and Mesozoic intracontinental deformation in Central Asia:Constraints from apatite fission-track thermochronology[J].Journal of Asian Earth Sciences,2007,29:188-204.
[11]周鼎武,苏犁,简平,等.南天山榆树沟蛇绿岩地体中高压麻粒岩SHRIMP锆石U-Pb年龄及构造意义[J].科学通报,2004,49:1411-1415.
[12]龙灵利,高俊,熊贤明,等.南天山库勒湖蛇绿岩地球化学特征及其年龄[J].岩石学报,2004,22:65-73.
[13]王超,刘良,车自成,等.西南天山阔克萨彦岭巴雷公镁铁质岩石的地球化学特征、LA-ICP-MS U-Pb年龄及其大地构造意义[J].地质论评,2007,55:743-753.
[14]马中平,夏林圻,徐学义,等.南天山库鲁湖蛇绿岩LA-ICPMS锆石U-Pb定年及其地质意义[J].西北大学学报,2007,37:107-110.
[15]Wang Q C,Shu L S,Charvet J,et al.Understanding and study perspectives on tectonic evolution and crustal structure of the Paleozoic Chinese Tianshan[J].Episodes,2010,33:242-266.
[16]Wang B,Shu L S,Faure M,et al.Paleozoic tectonics of the southern Chinese Tianshan:Insights from structural,chronological and geochemical studies of the Heiyingshan ophiolitic mélange(NW China)[J].Tectonophysics,2011,497:85-104.
[17]王作勋,邬继易,吕喜朝,等.天山多旋回构造演化及成矿[M].北京:科学出版社,1990.
[18]Liu Y,Hao S G.Evolutionary significance of Pylentonemid radiolarians and their Late Devonian species from southwestern Tianshan,China[J].Acta Geologica Sinica,2006,80:647-655.
[19]舒良树,王博,朱文斌.南天山蛇绿混杂岩放射虫化石的时代及其构造意义[J].地质学报,2007,81(9):1161-1168.
[20]李玮,胡健民,高卫等.新疆南天山库尔干一带泥盆纪—早石炭世放射虫组合的发现[J].中国地质,2007,34(4):584-591.
[21]Chen B,Long X P,Yuan C,et al.Geochronology and geochemistry of Late Ordovician-Early Devonian gneissic granites in the Kumishi area,northern margin of the South Tianshan Belt:Constraints on subduction process of the South Tianshan Ocean[J].Journal of Asian Earth Sciences,2015,113:293-309.
[22]Simonov V A,Sakiev K S,Volkova N I,et al.Conditions of formation of the Atbashi ridge eclogites(South Tien Shan)[J].Russian Geology and Geophysics,2008,49:803-815.
[23]Khristov Ye V,Ivanov K S,Mikolaichuk A V,et al.Structural position and age of ophiolites of Karaterek massive[J].Izvestia Academii Nauk Respubliki Kyrgyzstan,1999,65-69(in Russian).
[24]Biske Yu S,Seltmann R.Paleozoic Tian-Shan as a transitional region between the Rheic and Urals-Turkestan oceans[J].Gondwana Research,2010,17:602-613.
[25]Biske Yu S,Konopelko D L,Seltmann R.Geodynamics of late Paleozoic magmatism in the Tien Shan and its framework[J].Geotectonics,2013,47:291-309.
[26]Alekseev D V,Aristov V A,Degtyarev K E.The age and tectonic setting of volcanic and cherty sequences in the ophiolite complex of the Atbashe Ridge(Southern Tien Shan)[J].Doklady Earth Sciences,2007,413A:380-383.
[27]De Grave J,Glorie S,Busiov M M,et al.Thermo-tectonic history of the Issyk-Kul basement(Kyrgyz Northern Tien Shan,Central Asia)[J].Gondwana Research,2013,23:998-1020.
[28]Burtman V S.Nappes of the southern Tien Shan[J].Russian Journal of Earth Sciences,2008,10:ES1006.doi:10.2205/2007ES000223.
[29]Seltmann R,Konopelko D,Biske G,et al.Hercynian postcollisional magmatism in the context of Paleozoic magmatic evolution of the Tianshan orogenic belt[J].Journal of Asian Earth Sciences,2011,42:821-838.
[30]Xiao W J,Windley B F,Allen M B,et al.Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage[J].Gondwana Research,2013,23:1316-1341.
[31]Gao J,Long L,Klemd R,et al.Tectonic evolution of theSouth Tianshan orogen and adjacent regions,NW China:Geochemical and age constraints of granitoid rocks[J].International Journal of Earth Sciences,2009,98:1221-1238.
[32]Qian Q,Gao J,Klemd R,et al.Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen:Constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate,NW China[J].International Journal of Earth Sciences,2009,98:551-569.
[33]Windley B F,Alexeiev D,Xiao W J,et al.Tectonic models for accretion of the Central Asian Orogenic Belt[J].Journal of the Geological Society of London,2007,164:31-47.
[34]Burtman V S.The Tien Shan Early Paleozoic tectonics and geodynamics[J].Russian Journal of Earth Sciences,2006,8:ES3003.doi:10.2205/2006ES000202.
[35]Hegner E,Klemd R,Krner A,et al.Mineralogy ages and P-T conditions of late Paleozoic high-pressure eclogite and provenance of mélange sediments in the South Tianshan Orogen of Kyrgyzstan[J].American Journal of Science,2010,310:916-950.
[36]ЖуковЮВ,ЗахаровИЛ,БерезанскийАВ.геологическаякартакыргызскойреспублики,1∶500000[M].2008.
[37]Glorie S,Grave J D,Buslov M M,et al.Tectonic history of the Kyrgyz South Tien Shan(Atbashi-Inylchek)suture zone:The role of inherited structures during deformation-propagation[J].Tectonics,2011,30:TC6016.doi:10.1029/2011TC002949.
[38]Biske Y S,Zubtsov Y S,Porshnyakov G S.Hercynides of the Atbashi-Kokshaal Region of the Southern Tian-Shan[M].Leningrad,Russia,Leningrad State University Publishing,1985:190(in Russian).
[39]Lu S,Li H,Zhang C,et al.Geological and geochronological evidence for the Precambrian evolution of the Tarim craton and surrounding continental fragments[J].Precambrian Research,2008,160:94-107.
[40]李忠,高剑,郭春涛,等.塔里木块体北部泥盆—石炭纪陆缘构造演化:盆地充填序列与物源体系约束[J].地学前缘,2015,22:35-52.
[41]常健,邱楠生,李佳蔚.塔里木盆地与南天山的耦合关系:来自(U-Th)/He年龄的新证据[J].地学前缘,2012,19:234-243.
[42]汤良杰,邱海峻,云露等.塔里木盆地北缘—南天山造山带盆-山耦合和构造转换[J].地学前缘,2012,19:195-204.
[43]Solomovich L I,Trifonov B A.Postcollisional granites in the South Tien Shan Variscan collisional belt,Kyrgyzstan[J].Journal of Asian Earth Sciences,2002,21:7-21.
[44]Konopelko D,Biske G,Seltmann M,et al.Deciphering Caledonian events:Timing and geochemistry of the Caledonian magmatic arc in the Kyrgyz Tien Shan[J].Journal of Asian Earth Sciences,2008,32:131-141.
[45]Agramonte Y R,Kroner A,Alexeiev D V,et al.Detrital and igneous zircon ages for supracrustal rocks of the Kyrgyz Tianshan and palaeogeographic implications[J].Gondwana Research,2014,26:957-974.