东昆仑清水泉辉绿岩脉地球化学及LA-ICP-MS锆石U-Pb定年

任军虎, 柳益群, 冯乔, 韩文中, 高辉, 周鼎武. 东昆仑清水泉辉绿岩脉地球化学及LA-ICP-MS锆石U-Pb定年[J]. 岩石学报, 2009, 25(5): 1135-1145.
引用本文: 任军虎, 柳益群, 冯乔, 韩文中, 高辉, 周鼎武. 东昆仑清水泉辉绿岩脉地球化学及LA-ICP-MS锆石U-Pb定年[J]. 岩石学报, 2009, 25(5): 1135-1145.
REN JunHu, LIU YiQun, FENG Qiao, HAN WenZhong, GAO Hui, ZHOU DingWu. LA-ICP-MS U-Pb zircon dating and geochemical characteristics of diabase-dykes from the Qingshuiquan area, eastern Kunlun orogenic belt[J]. Acta Petrologica Sinica, 2009, 25(5): 1135-1145.
Citation: REN JunHu, LIU YiQun, FENG Qiao, HAN WenZhong, GAO Hui, ZHOU DingWu. LA-ICP-MS U-Pb zircon dating and geochemical characteristics of diabase-dykes from the Qingshuiquan area, eastern Kunlun orogenic belt[J]. Acta Petrologica Sinica, 2009, 25(5): 1135-1145.

东昆仑清水泉辉绿岩脉地球化学及LA-ICP-MS锆石U-Pb定年

  • 基金项目:

    中石化重大项目《中国西北地区构造-岩相古地理研究与编图》

LA-ICP-MS U-Pb zircon dating and geochemical characteristics of diabase-dykes from the Qingshuiquan area, eastern Kunlun orogenic belt

  • 结合地质、地球化学及LA-ICP-MS锆石U-Pb定年研究表明,东昆仑清水泉地区辉绿岩脉的主元素以低TiO2(0.68%~1.24%)和较低的MgO(4.96%~7.25%)及K2O(0.51%~1.03%),贫P2O5(0.09%~0.16%), Na2O>K2O为特征,∑REE总量较高, LREE明显富集。与原始地幔相比,明显富集Rb、Ba、Th、U和Sr,高场强元素分异明显,出现Nb、Ta亏损和Th富集特征,结合Nb/La、Hf/Ta、La/Ta、Ti/Y、Zr/Y和Th/Nb等比值综合分析认为岩浆来源于富集地幔,源区曾受不同程度的俯冲带流体交代作用的影响,应形成于活动大陆边缘环境;岩脉的LA-ICP-MS锆石U-Pb定年结果为436.4±1.2Ma(MSWD=0.37),代表清水泉辉绿岩脉的结晶年龄,为早古生代晚期东昆仑洋消减俯冲的弧后拉张裂解的形成时限提供了约束。
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出版历程
收稿日期:  2008-06-27
修回日期:  2008-10-08
刊出日期:  2009-05-31

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