东天山咸水泉片麻状花岗岩特征、年龄及成因

唐俊华 顾连兴 张遵忠 吴昌志 三金柱 汪传胜 刘四海 张光辉. 东天山咸水泉片麻状花岗岩特征、年龄及成因[J]. 岩石学报, 2007, 23(8): 1803-1820.
引用本文: 唐俊华 顾连兴 张遵忠 吴昌志 三金柱 汪传胜 刘四海 张光辉. 东天山咸水泉片麻状花岗岩特征、年龄及成因[J]. 岩石学报, 2007, 23(8): 1803-1820.
TANG JunHua, GU LianXing, ZHANG ZunZhong, WU ChangZhi, SAN JinZhu, WANG ChuanSheng, LIU SiHai,ZHANG GuangHui, Department of Earth Sciences, Nanjing University, Nanfing 210093, China; 2. State Key Laboratory of Geological Processes and Mineral Resources, C. Characteristics, age and origin of the Xianshuiquan gneissose granite in eastern Tianshan[J]. Acta Petrologica Sinica, 2007, 23(8): 1803-1820.
Citation: TANG JunHua, GU LianXing, ZHANG ZunZhong, WU ChangZhi, SAN JinZhu, WANG ChuanSheng, LIU SiHai,ZHANG GuangHui, Department of Earth Sciences, Nanjing University, Nanfing 210093, China; 2. State Key Laboratory of Geological Processes and Mineral Resources, C. Characteristics, age and origin of the Xianshuiquan gneissose granite in eastern Tianshan[J]. Acta Petrologica Sinica, 2007, 23(8): 1803-1820.

东天山咸水泉片麻状花岗岩特征、年龄及成因

  • 基金项目:

    致谢锆石LA-ICP-MS U-Pb年龄测试由胡建博士在西北大学大陆动力学教育部重点实验室完成;锆石阴极发光图像由广州地球化学研究所同位素年代学和地球化学重点实验室陈林丽高工完成;刘勇胜教授及汪相教授给予了热情的指导;本文Nd同位素测试由中国科学院地质与地球物理研究所同位素地球化学实验室资助,并在陈福坤研究员指导下完成;宋彪研究员及另一位匿名审稿人提出了指导性的修改意见和建议;作者等于此一并表示衷心感谢.国家自然科学基金项目(40472042,40672040,40603008)和中国地质大学(北京)地质过程与矿产资源国家重点实验室开放基金(GPMR200629)成果.

Characteristics, age and origin of the Xianshuiquan gneissose granite in eastern Tianshan

  • 野外地质关系及岩相学、地球化学、同位素和年代学研究表明,咸水泉片麻状花岗岩是典型的原地改造型花岗岩,其原岩(即围岩)为糜棱岩化花岗闪长岩。本次锆石LA-ICP-MS U-Pb定年获得其原岩糜棱岩化花岗闪长岩^206Pb/^238U加权平均年龄为369.9±5.6Ma(MSWD=36),片麻状花岗岩锆石核部年龄为367.9±5.4Ma(MSWD=2.2),此年龄与其原岩年龄在误差范围内一致,为片麻状花岗岩原地改造成因提供了年代学证据。此外。还获得其锆石热液增生边不一致线下交点年龄254±10Ma(MSWD=1.4),该年龄代表了片麻状花岗岩的形成时间。片糜状花岗岩在地球化学上继承了许多原岩的特征,同时又受到了深源流体-熔体的显著影响。将原岩糜棱岩化花岗闪长岩改造成片麻状花岗岩的流体-熔体具有富硅富钾和正БNd(t)值的特征,表明这种流体-熔体可能主要地来自幔源岩浆内侵体,以及在内侵岩浆热量作用下的初生地壳岩石的变质和熔融。原岩糜棱岩化花岗闪长岩及其派生的片麻状花岗岩БNd(t)值分别为+3.87及+3.05~+6.09,表明糜棱岩化花岗闪长岩源自于年轻的陆壳,而片麻状花岗岩除继承了其原岩糜棱岩化花岗闪长岩的高БNd(t)值这一特征外,还可能受到了深源流体.熔体中幔源组分的影响。咸水泉岩体的实例研究表明,原地改造型片麻状花岗岩不但可以形成于造山带的挤压-伸展转折阶段,还可以形成于碰撞后进一步伸展的时期,而经过强烈韧性剪切的岩石是转变为片麻状花岗岩的最有利原岩。东天山咸水泉、平顶山和天湖东等原地改造型片麻状花岗岩的形成均与内侵有关,因而片麻状花岗岩可被看作是内侵的重要产物。
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修回日期:  2007-03-03
刊出日期:  2007-08-31

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