中天山南缘乌瓦门地区蛇绿混杂岩中前寒武花岗质岩块年代的厘定及其构造意义
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摘要
中天山乌瓦门地区蛇绿混杂岩中出露了较多的花岗质岩块,但对于其来源、属性、形成时代及其构造意义,尚缺乏系统的厘定。岩相学表明,乌瓦门地区构造混杂岩中的花岗质岩具有区域变质成因的花岗质岩石特点,经定年测试分析乌瓦门混杂岩中变质花岗质岩中的锆石年龄为(2343±11)Ma和(1702±22)Ma,进一步表明它们并不是与蛇绿岩形成过程中有成因联系的斜长花岗岩。通过对比中天山地块和塔里木地块的岩相学、地层学以及岩浆事件记录,进一步支持中天山地块存在前寒武纪基底及其与塔里木克拉通的构造亲缘性。
There are many occurrence granitic rocks in the Wuwamen ophiolite melange in Zhongtianshan,Xinjiang,but their origin,formation age and tectonic implication still remain unknown.Petrographic analysis of the granitic rocks indicated that they have the characteristics of rocks formed by regional metamorphism.Zircon U-Pb dating analysis were carried out on the granitic rocks from the melange in the Wuwamen area,which gives concordant zircon U-Pb ages at ac.(2343±11)Ma and(1702±22)Ma.These Paleoproterozoic ages suggests that there are no genetic relations between the granite blocks and the Wuwamen ophiolites.By comparing the stratigraphy and petrography of the Zhongtianshan arc terrane and the northern Tarim block,further supported the existence of Precambrian basement in the Zhongtianshan terrane and its tectonic affinities with the Tarim craton.
There are many occurrence granitic rocks in the Wuwamen ophiolite melange in Zhongtianshan,Xinjiang,but their origin,formation age and tectonic implication still remain unknown.Petrographic analysis of the granitic rocks indicated that they have the characteristics of rocks formed by regional metamorphism.Zircon U-Pb dating analysis were carried out on the granitic rocks from the melange in the Wuwamen area,which gives concordant zircon U-Pb ages at ac.(2343±11)Ma and(1702±22)Ma.These Paleoproterozoic ages suggests that there are no genetic relations between the granite blocks and the Wuwamen ophiolites.By comparing the stratigraphy and petrography of the Zhongtianshan arc terrane and the northern Tarim block,further supported the existence of Precambrian basement in the Zhongtianshan terrane and its tectonic affinities with the Tarim craton.
引文
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[2]XIAO W J,WINDLEY B F,HAO J,et al.Accretion leading to collision and the Permian Solonker suture,Inner Mongolia,China:termination of the central Asian orogenic belt[J].Tectonics,2003,22(6):1-21.
[3]XIAO W J,WINDLEY B F,SUN S,et al.A tale of amalgamation of three Permo-Triassic collage systems in Central Asia:oroclines,sutures,and terminal accretion[J].Annual Review of Earth and Planetary Sciences,2015,43:477-507.
[4]GAO J,KLEMD R,LONG L L,et al.Adakitic signature formed by fractional crystallization:an interpretation for the Neo-Proterozoic meta-plagiogranites of the NE Jiangxi ophiolitic mélange belt,South China[J].矿物岩石地球化学通报,2009,110(增刊1):277-293.
[5]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(4):1316-1341.
[6]HAN Y G,ZHAO G C.Final amalgamation of the Tianshan and Junggar orogenic collage in the southwestern Central Asian Orogenic Belt:constraints on the closure of the Paleo-Asian Ocean[J].Earth-Science Reviews,2018,186:129-152.
[7]JIANG T,GAO J,KLEMD R,et al.Paleozoic ophiolitic melanges from the South Tianshan Orogen,NW China:Geological,geochemical and geochronological implications for the geodynamic setting[C]//中国科学院地质与地球物理研究所2014年度(第14届)学术年会论文汇编,2015:271-292.
[8]杨高学,李永军,佟丽莉,等.西准噶尔海山俯冲的地质效应:来自泥盆纪-石炭纪火山岩地球化学证据[J].地学前缘,2017,24(6):60-67.
[9]董云鹏,周鼎武,张国伟,等.中天山南缘乌瓦门蛇绿岩形成构造环境[J].岩石学报,2005,21(1):37-44.
[10]ZHONG L L,WANG B,ALEXEIEV D V,et al.Paleozoic multi-stage accretionary evolution of the SW Chinese Tianshan:new constraints from plutonic complex in the Nalati Range[J].Gondwana Research,2017,45:254-274.
[11]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.
[12]肖序常,汤耀庆,冯益民,等.新疆北部及其邻区大地构造[M].北京:地质出版社,1992.
[13]高俊.西南天山榴辉岩的发现及其大地构造意义[J].科学通报,1997,42(7):737-740.
[14]胡霭琴,韦刚健,邓文峰,等.天山东段1.4Ga花岗闪长质片麻岩SHRIMP锆石U-Pb年龄及其地质意义[J].地球化学,2006,35(4):333-315.
[15]胡霭琴.新疆北部地质演化及成岩成矿规律[M].北京:科学出版社,1997.
[16]陈义兵,胡霭琴,张国新,等.西天山前寒武纪天窗花岗片麻岩的锆石U-Pb年龄及Nd-Sr同位素特征[J].地球化学,1999(6):515-520.
[17]陈新跃,王岳军,孙林华,等.天山冰达坂和拉尔敦达坂花岗片麻岩SHRIMP锆石年代学特征及其地质意义[J].地球化学,2009,38(5):424-431.
[18]杨天南,李锦轶,孙桂华,等.中天山早泥盆世陆弧:来自花岗质糜棱岩地球化学及SHRIMP-U/Pb定年的证据[J].岩石学报,2006,22(1):41-48.
[19]朱永峰,郭璇,周晶.新疆中天山巴仑台地区晚石炭世+εNd辉长岩体的岩石学和同位素地球化学研究[J].岩石学报,2006,22(5):1178-1192.
[20]WANG X S,GAO J,KLEMD R,et al.The Central Tianshan Block:a microcontinent with a Neoarchean-Paleoproterozoic basement in the southwestern Central Asian Orogenic Belt[J].Precambrian Research,2017,295:130-150.
[21]LIU Y S,GAO S,HU Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite interactionsin theTransNorth China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010,51:537-571.
[22]ANDERSEN T.Correction of common lead in U-Pb analyses that donot report 204Pb[J].Chemical Geology,2002,192(1):59-79.
[23]LUDWIG K R.Aplotting and regression program for radiogenic-isotope data[R].U.S.Geologcial Survey Open-File Report,1991
[24]YUAN H L,GAO S,LIU X M.Accurate U-Pb age and trace element determinations of zircon by laser ablation inductively coupled plasma mass spectrometry[J].Geostandards and Geoanalytical Research,2004,28(3):353-370.
[25]陈义兵,胡霭琴,张国新,等.天山东段尾亚麻粒岩REE和SmNd同位素特征[J].地球化学,1997(4):70-77.
[26]HU A Q,JAHN B M,ZHANG G X,et al.Crustal evolution and Phanerozoic crustal growth in northern Xinjiang:Nd isotopic evidence.PartⅠ.Isotopic characterization of basement rocks[J].Tectonophysics,2000,328:15-51.