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新疆东准噶尔北部青格里河下游花岗岩类的时代及地质意义
引用本文:周刚,张招崇,谷高中,杨文平,何斌,张小林,罗世宾,王祥,贺永康.新疆东准噶尔北部青格里河下游花岗岩类的时代及地质意义[J].现代地质,2006,20(1):141-150.
作者姓名:周刚  张招崇  谷高中  杨文平  何斌  张小林  罗世宾  王祥  贺永康
作者单位:1. 中国地质科学院,地质研究所,北京,100037;新疆地质矿产局,第四地质大队,新疆,阿勒泰,836500
2. 中国地质大学,地质过程与矿产资源国家重点实验室,北京,100083
3. 新疆地质矿产局,第四地质大队,新疆,阿勒泰,836500
基金项目:国家"305"科技攻关项目;中国科学院资助项目;教育部跨世纪优秀人才培养计划;科技部科研项目;新疆区域地质矿产调查项目
摘    要:选取新疆东准噶尔北部青格里河下游一带乌图布拉克、阿热勒托别和哈旦逊岩体等具一定规模的3个代表性岩体,通过全岩Rb-Sr等时线同位素定年,确定了研究区内玛音鄂博断裂南侧花岗岩类的形成时代分别为(334.1±9.5)M a、(300±9)M a和(280±12)M a,其初始87Sr/86Sr比值分别为0.704 33、0.704 35和0.703 84。结果表明研究区内花岗岩分别形成于华力西中晚期的不同阶段。乌图布拉克岩体形成于早石炭世,为碰撞造山作用晚期的钙碱性花岗岩,可能是早泥盆世富Nb玄武岩部分熔融的产物;结合前人厘定的板块俯冲时间(408~376 M a),推测西伯利亚板块与哈萨克斯坦—准噶尔板块的碰撞时限为376~334 M a。阿热勒托别岩体形成于后碰撞拉张环境,可能是形成于岛弧环境的中基性火山岩部分熔融的产物;哈旦逊岩体虽然也形成于后碰撞拉张环境,但拉张程度更高,属于与岩浆底侵作用有关的花岗岩类。

关 键 词:Rb-Sr等时线年龄  花岗岩类  碰撞  底侵  东准噶尔北部  新疆
文章编号:1000-8527(2006)01-0141-10
收稿时间:11 16 2005 12:00AM
修稿时间:12 25 2005 12:00AM

Dating of Granitic Plutons and Its Geological Implications in the Lower Reaches of the Qinggeli River in the Northern Part of East Junggar, Xinjiang
ZHOU Gang,ZHANG Zhao-chong,GU Gao-zhong,YANG Wen-ping,HE Bin,ZHANG Xiao-lin,LUO Shi-bin,WANG Xiang,HE Yong-kang.Dating of Granitic Plutons and Its Geological Implications in the Lower Reaches of the Qinggeli River in the Northern Part of East Junggar, Xinjiang[J].Geoscience——Journal of Graduate School,China University of Geosciences,2006,20(1):141-150.
Authors:ZHOU Gang  ZHANG Zhao-chong  GU Gao-zhong  YANG Wen-ping  HE Bin  ZHANG Xiao-lin  LUO Shi-bin  WANG Xiang  HE Yong-kang
Abstract:Three representative plutons,Wutubulak,Areletuobie and Hadansun,in the lower reaches of the Qinggeli river in the northern part of East Junggar,Xinjiang were chosen for Rb-Sr isochron dating.The results show that the formation-ages of granitic plutons in the southern side of the Mayin'ebo fault in the researched area are(334.1±9.5) Ma,(300±9) Ma and(280±12) Ma with the initial ~(87)Sr/~(86)Sr ratios of 0.70433,0.70435 and 0.70384,respectively,and that they were generated at different stages of middle-late Variscan Movement.The Wutubulak pluton,which formed at Early Carboniferous,belong to calc-alkaline series,was likely produced by partial melting of the Early Devonian Nb-enriched basalts during post-collisional event.In combination with the previously assumed plate subduction time(408-376 Ma),the collision of Siberian Plate with Kazakstan-Junggar Plate can be limited within the range of 376-334 Ma.The Areletuobie pluton formed in an extensional setting subsequent to post-collision,and it is inferred to be generated by partial melting of intermediate-basic volcanic rocks that might form in an island arc setting.Although the Hadansun pluton also formed in an extensional environment of post-collision,it might be related to magma underplating under a strong extensional environment.
Keywords:Rb-Sr isochrone age  granitoid  collision  underplating  northern part of East Junggar  Xinjiang
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