| 西藏甲玛中酸性侵入岩LA-ICP-MS锆石U-Pb定年及成矿意义 |
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| 引用本文：秦志鹏,汪雄,多吉,唐晓倩,周云,彭惠娟.2011.LA-ICP-MS U-Pb zircon age of intermediate-acidic intrusive rocks in Jiama of Tibet and its metallogenic significance[J].Mineral Deposits,30(2):339~348 |
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| 基金项目:本文得到国家973项目（编号：2011CB403103）、国土资源部科学基地协作研究（编号：200911007-02）、青藏专项（编号：1212010818089）、技术开发项目（编号：E0804）、教育部学科建设项目（编号：SZD0407）的共同资助 |
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| 中文摘要:文章研究了甲玛矿区内中酸性侵入岩的侵位时序及岩浆-成矿作用。以实测地质资料为基础，结合中酸性侵入岩的LA-ICP-MS锆石U-Pb定年，初步厘定了甲玛矿区内中酸性岩浆岩的侵位时序，从早至晚依次为：花岗斑岩（15.31～16.27 Ma）—石英闪长玢岩—二长花岗斑岩（14.81 Ma）—花岗闪长斑岩。以辉钼矿为例，甲玛矿床显示有3期成矿作用，各期成矿过程分别对应于花岗斑岩或石英闪长玢岩、二长花岗斑岩和花岗闪长斑岩3期不同强度的岩浆作用过程。甲玛矿床的形成是3期岩浆-成矿作用叠加的结果。 |
| 中文关键词:地球化学 LA-ICP-MS锆石U-Pb定年 成矿意义 甲玛 西藏 |
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| LA-ICP-MS U-Pb zircon age of intermediate-acidic intrusive rocks in Jiama of Tibet and its metallogenic significance |
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| Abstract:This paper deals with the emplacement timing of the intermediate_acidic intrusive rocks in Jiama of Tibet and its metallogenic significance. Based on the measured geological data and LA-ICP-MS U-Pb zircon ages of the four intermediate-acidic intrusive rocks, the authors preliminarily regularized the timing sequence, which is from early to late in order of porphyry granite (15.31 Ma～16.27 Ma)-quartz diorite porphyrite-adamellite porphyry (14.81 Ma)-granodiorite-porphyry; Exemplified by molybdenum，the Jiama ore deposit assumes three periods of metallogenesis, i.e., the ore-forming processes corresponding respectively to different degrees of magmatic activities of porphyry granite or quartz diorite porphyrite, adamellite porphyry and granodiorite-porphyry. The Jiama ore deposit resulted from the superposition of the three periods of magma-mineralization. |
| keywords:geolcemistry, LA-ICP-MS zircon U-Pb dating, metallogenic significance, Jiama, Tibet |
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