| 东昆仑阿牙克库木湖北巴什尔希花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义 |
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| 引用本文： | 高晓峰,校培喜,谢从瑞,范立勇,过 磊,奚仁刚.东昆仑阿牙克库木湖北巴什尔希花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].地质通报,2010,29(7):1001-1008. |
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| 作者姓名： | 高晓峰 校培喜 谢从瑞 范立勇 过 磊 奚仁刚 |
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| 作者单位： | 1. 中国地质调查局西安地质矿产研究所,陕西西安,710054
2. 中国石油长庆油田分公司勘探开发研究院,陕西西安,710018 |
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| 基金项目： | 中国地质调查局工作项目 |
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| 摘 要： | 巴什尔希岩体分布在东昆仑西段白干湖断裂和阿尔金断裂之间,岩性主要为二长花岗岩和钾长花岗岩,其中二长花岗岩与白干湖钨、锡多金属矿床关系密切。对锆石内部结构、阴极发光图像特征和Th/U比值的研究表明,二长花岗岩中的锆石为岩浆锆石。锆石LA-ICP-MSU-Pb同位素分析结果显示,二长花岗岩形成年龄为(458.0±9.0)Ma。结合前人对巴什尔希钾长花岗岩的锆石U-Pb定年(432.3±0.8)Ma,初步认为该岩体为晚奥陶世—早志留世侵入体。元素地球化学特征显示,巴什尔希花岗岩为弱准铝质或弱过铝质A型花岗岩,是东昆仑地区加里东期局部弧后盆地拉张过程中,地幔底侵导致地壳物质熔融的产物。
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| 关 键 词： | 花岗岩 锆石LA-ICP-MS U-Pb定年 巴什尔希 东昆仑 |
Zircon LA-ICP-MS U-Pb dating and geological significance of Bashierxi granite in the eastern Kunlun area, China |
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| GAO Xiao-feng,XIAO Pei-xi,XIE Cong-rui,FAN Li-yong,GUO Lei,XI Ren-gang.Zircon LA-ICP-MS U-Pb dating and geological significance of Bashierxi granite in the eastern Kunlun area, China[J].Geologcal Bulletin OF China,2010,29(7):1001-1008. |
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| Authors: | GAO Xiao-feng XIAO Pei-xi XIE Cong-rui FAN Li-yong GUO Lei XI Ren-gang |
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| Institution: | 1. Xi'an Institute of Geology and Mineral Resource, China Geological Survey, Xi'an 710054, Shaanxi, China; 2. Research Institute of Exploration and Development, Petrochina Changqing Oilfield Campany, Xi'an 710018, Shaanxi China |
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| Abstract: | The Bashierxi pluton is located in the western segment of the eastern Kunlun, between Baiganhu fault and Aerjin fault, this pluton mainly consists of monzonitic granite and K-feldspar granite, and the monzonitic granite is closely related with the ore-forming process of the Baiganhu tungsten-tin deposit. The internal structures, cathodeluminescence (CL) images and Th/U ratios of the zircon grains from the monzonitic granite reveal that these zircon grains have typical characteristics of magmatic zircon. The LA-ICP-MS analyses show that the zircon grains from the monzonitic granite have concordant U-Pb ages of (458.0±9.0)Ma, on the other hand, the zircon grains from the K-feldspar granite have U-Pb ages of (432.3±0.8)Ma, these data indicated that the Bashierxi pluton is a intrusion formed from Late Ordovician to Early Silurian. Major and trace element data of the monzonitic granite show that Bashierxi granite is weakly metaluminous or peraluminous A-type granite. These rocks were considered as melts derived from crustal source during back-arc basin extension in eastern Kunlun, and the early Baiganhu tungsten-tin deposit era is represented by the ages of monzonitic granite. |
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| Keywords: | granite zircon LA-ICP-MS U-Pb dating Bashierxi eastern Kunlun |
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