中天山南缘木斯陶萨拉南地区石英闪长岩锆石年龄及构造意义
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摘要
为确定中天山南缘地区侵入岩的成因和构造背景,并且为南天山洋盆的俯冲时限及俯冲极性提供证据,对中天山南缘木斯陶萨拉南地区的石英闪长岩进行了LA-ICP-MS锆石U-Pb定年和岩石地球化学研究。结果表明,岩石的平均年龄为(309±3.8)Ma,属晚石炭世岩浆活动的产物;岩体由一套钙碱性系列过铝质岩石组成,其稀土元素配分型式为明显的右倾模式,轻稀土强烈富集,重稀土强烈亏损,具有较高的(La/Yb)_N值(8.5～50.31)和较弱的Eu正异常或无异常(δEu为1.01～1.3);微量元素蛛网图显示岩石为大离子亲石元素Ba、Sr、K相对富集,高场强元素Nb、Ta、Ti、P相对亏损。综合分析认为,石英闪长岩应形成于火山弧环境,是幔源岩浆底侵带来的大量热能使晚古生代下地壳物质发生部分熔融的产物,记录了晚石炭世南天山洋向中天山微地块之下的俯冲岩浆活动。
In order to determine the origin and tectonic setting of intrusions in the southern margin of Central Tianshan Terrane,and provide evidence to constrain the timing and direction of the subduction of the South Tianshan Ocean,systematic study on quartz diorite in the southern Musitaosala Area is performed.The intrusion has zircon LA-ICP-MS U-Pb ages(309±3.8)Ma,a product of Carboniferous magmatism.The rocks belong to peraluminous calc-alkaline rocks series and are characterized by LREE enrichment with high(La/Yb)_Nratios(8.5-50.31)and weakly positive Eu anomaly(δEu=1.01-1.3).In addition,they display the enrichment of LILE(Ba,Sr and K)and depletion of HFSE(Nb,P,Ta and Ti).The geochemical characteristics suggest that parental magmas of quartz diorite are the product of partial melting of Late Palaeozoic lower crust due to the underplating of mantle-derived magma.Therefore,the Late carboniferous quartz diorite records northward subduction of South Tianshan ocean beneath the Central Tianshan Terrane.
In order to determine the origin and tectonic setting of intrusions in the southern margin of Central Tianshan Terrane,and provide evidence to constrain the timing and direction of the subduction of the South Tianshan Ocean,systematic study on quartz diorite in the southern Musitaosala Area is performed.The intrusion has zircon LA-ICP-MS U-Pb ages(309±3.8)Ma,a product of Carboniferous magmatism.The rocks belong to peraluminous calc-alkaline rocks series and are characterized by LREE enrichment with high(La/Yb)_Nratios(8.5-50.31)and weakly positive Eu anomaly(δEu=1.01-1.3).In addition,they display the enrichment of LILE(Ba,Sr and K)and depletion of HFSE(Nb,P,Ta and Ti).The geochemical characteristics suggest that parental magmas of quartz diorite are the product of partial melting of Late Palaeozoic lower crust due to the underplating of mantle-derived magma.Therefore,the Late carboniferous quartz diorite records northward subduction of South Tianshan ocean beneath the Central Tianshan Terrane.
引文
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高俊,钱青,龙灵利,张喜,李继磊,苏文.2009.西天山的增生造山过程.地质通报,28(12),1804-1816
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Harris N B W,Pearce J A,Tindle A G.1986.Geochemical characteristics of collision-zone magmatism.Collision Tectonics,London,Special Publications,19(5):67-81
Liu Y S,Hu Z C,Gao S,Günther D,Xu J,Gao C G,Chen H H.2008.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard.Chemical Geology,257(1-2):34-43.
Long L L,Gao J,Klemd R,Beier C,Qian Q,Zhang X,Wang J B,Jiang T.2011.Geochemical and geochronological studies of granitoid rocks from the Western Tianshan Orogen:Implications for continental growth in the southwestern Central Asian Orogenic Belt.Lithos,126(3-4):321-340
Ludwig K R.2003.ISOPLOT 3.0:A geochronological toolkit for Microsoft Excel.Berkeley Geochronology Center,Berkeley,Special Publication No.4a:1-70
Ma X X,Shu L S,Meert J G.2015.Meert JG.Early Permian slab breakoff in the Chinese Tianshan belt inferred from the post-collisional granitoids.Gondwana Research,27(1):228-243
Maniar P D,Piccoli P M.1989.Tectonic discrimination of granitoids.GSA Bulletin,101(5):635-643
Middlemost E A K.1994.Naming materials in the magma/igneous rock system.Earth-Science Reviews,37(3-4):215-224
Pearce J A,Harris N B W,Tindle A G.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,25(4):956-983
Peccerillo A,Taylor S R.1976.Geochemistry of eocene calc-alkaline volcanic rocks from the kastamonu area,northern turkey.Contributions to Mineralogy and Petrology,58(1):63-81
Rapp R P,Watson E B.1995.Dehydration melting of metabasalt at 8-32kbar:Implications for continental growth and crust-mantle recycling.Journal of Petrology,36(4):891-931
Ross T S,Mclennan S M.1995.The geochemical evolution of the continental crust.Reviews of Geophysics,33(2):241-265
Sun S S,Mcdonough W F.1989.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes.Geological Society,London,Special Publications,42(1):313-345
Wang B,Chen Y,Zhan S,Shu L S,Faure M,Cluzel D,Charvet J,Laurent-Charvet S.2007.Primary carboniferous and Permian paleomagnetic results from the Yili Block(NW China)and their implications on the geodynamic evolution of Chinese Tianshan Belt.Earth and Planetary Science Letters,263(3):288-308
Windley B F,Allen M B,Zhang C,Zhao Z Y,Wang G R.1990.Paleozoic accretion and Cenozoic redeformation of the Chinese Tien Shan range,Central Asia.Geology,18(2):128-131
Xiao W J,Windley B F,Badarch G,Sun S,Li J Y,Qin K Z,Wang KZ.2004a.Palaeozoic accretionary and convergent tectonics of the southern Altaids:Implications for the growth of Central Asia.Journal of the Geological Society,161(3):339-342
Xiao W J,Zhang L C,Qin K Z,Sun S,Li J L.2004b.Paleozoic accretionary and collisional tectonics of the eastern Tianshan(China):Implications for the continental growth of central Asia.American Journal of Science,304(4):370-395
Zhang L F,Ai Y L,Li X P,Rubatto D,Song B,Williams S,Song SG,Ellis D,Liou J G.2007.Triassic collision of western Tianshan orogenic belt,China:Evidence from SHRIMP U-Pb dating of zircon from HP/UHP eclogitic rocks.Lithos,96(1-2):266-280
陈义兵,张国伟,柳小明,熊小林,袁超,陈林丽.2012.中天山巴仑台地区变形花岗岩类LA-ICP-MS U-Pb年代学及其构造意义.地质论评,58(1),117-125
董云鹏,张国伟,周鼎武,罗金海,张成立,夏林圻,徐学义,李向民.2005a.中天山北缘冰达坂蛇绿混杂岩的厘定及其构造意义.中国科学(D辑):地球科学,35(6):552-560
董云鹏,周鼎武,张国伟,张成立,夏林圻,徐学义,李向民.2005b.中天山南缘乌瓦门蛇绿岩形成构造环境.岩石学报,21(1):37-44
董云鹏,周鼎武,张国伟,赵霞,罗金海,徐静刚.2006.中天山北缘干沟蛇绿混杂岩带的地质地球化学.岩石学报,22(1):49-56
高俊,龙灵利,钱青,黄德志,苏文,Klemd R.2006.南天山:晚古生代还是三叠纪碰撞造山带.岩石学报,22(5):1049-1061
高俊,钱青,龙灵利,张喜,李继磊,苏文.2009.西天山的增生造山过程.地质通报,28(12),1804-1816
韩宝福,郭召杰,何国琦.2010.“钉合岩体”与新疆北部主要缝合带的形成时限.岩石学报,26(8):2233-2246
姜常义,姜寒冰,叶书峰,夏明哲,逯东霞.2005.新疆库鲁克塔格地区二叠纪脉岩群岩石地球化学特征,Nd、Sr、Pb同位素组成与岩石成因.地质学报,79(6):823-833
靳刘圆,杨硕,伊其安,卞翔.2017.新疆中天山南缘代京却可却花岗岩锆石U-Pb年龄及地球化学特征.新疆地质,35(04):417-425
李昌年.1992.火成岩微量元素岩石学.武汉:中国地质大学出版社
李锦轶,王克卓,李亚萍,孙桂华,褚春华,李丽群,朱志新.2006.天山山脉地貌特征、地壳组成与地质演化.地质通报,25(8):895-909
李锦轶,肖序常.1999.对新疆地壳结构与构造演化几个问题的简要评述.地质科学,34(4):405-419
李平,徐学义,王洪亮,朱涛,万晓明.2012.中天山南缘那拉提碱性花岗岩岩石成因-来自锆石微量元素和Hf同位素的证据.地质通报,31(12):1949-1964
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