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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
引用本文:陈新跃,王岳军,孙林华,范蔚茗.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.
作者姓名:陈新跃  王岳军  孙林华  范蔚茗
作者单位:1. 湖南科技大学,土木工程学院,湖南,湘潭,411201;中国科学院,广州地球化学研究所,广东,广州,510640
2. 中国科学院,广州地球化学研究所,广东,广州,510640
3. 宿州学院,地理与环境科学系,安徽,宿州,234000
基金项目:国家自然科学基金,中国科学院知识创新工程重要方向项目,湖南科技大学博士基金 
摘    要:西天山冰达坂和拉尔敦达坂地区出露前寒武纪花岗片麻岩,具有变余花岗结构和眼球状构造,表明经历了明显的动力变质作用;SHRIMP锆石U-Pb年代学测试表明它们分别形成于(926±8)Ma和(948±8)Ma,代表了9~10亿年左右的一次重要地质热事件,其中冰达坂花岗片麻岩分析数据中有一颗锆石的年龄为1.4Ga,与前人所报道的天山地区更古老的一期岩浆作用时代相同,可能代表了古老地壳物质的残留锆石。结合前人研究成果认为,天山地区普遍存在这一时期的岩浆作用,可能与Rodinia超大陆聚合过程中的Grenville造山运动有关。

关 键 词:花岗片麻岩  前寒武纪  格伦维尔造山  锆石SHRIMP  U-Pb年代学  天山

Zircon SHRIMP U-Pb dating of the granitic gneisses from Bingdaban an d Laerdundaban (Tianshan Orogen) and their geological significances
CHEN Xin-yue,WANG Yue-jun,SUN Lin-hua,FAN Wei-ming.Zircon SHRIMP U-Pb dating of the granitic gneisses from Bingdaban an d Laerdundaban (Tianshan Orogen) and their geological significances[J].Geochimica,2009,38(5):424-431.
Authors:CHEN Xin-yue  WANG Yue-jun  SUN Lin-hua  FAN Wei-ming
Institution:CHEN Xin-yue1,2*,WANG Yue-jun2,SUN Lin-hua3 and FAN Wei-ming2 1.School of Civil Engineering,Hunan University of Science and Technology,Xia ngtan 411201,China,2.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,3.Department of Geographical and Environmental Sciences,Suzhou University,Su zhou 234000
Abstract:The understanding of the forming and evolution of the Precambrian basement of the Tianshan Orogen had been limited by the lack of precise geochronological data. Precambrian granitic gneisses distributed in Bingdaban and Laerdundaban, Tianshan Orogen, have blastogranitic texture and augen structure, implying that they had undergone dynamic metamorphism. SHRIMP zircon U-Pb dating shows that they crystallized at (926 - 8) Ma and (948 ± 8) Ma, respectively, representing a thermal-tectonic event at ~ 1000 - 900 Ma. One of the zircon grains from the Bingdaban granitic gneisses yields older ages of 1.4 Ga, which is consistent with another magmatic age reported by previous study, suggesting inherited zircon from contamination of older continental materials. Combined with previous work, the magmatism between 1.0 and 0. 9 Ga is ubiquity in the Tianshan Mountains, which were probably related to the Grenville orogeny during the convergence of Rodiuia supercontinent.
Keywords:granitic gneiss  Precambrian  Grenville orogeny  zircon SHRIMP U-P b dating  Tianshan Orogen  
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