| 西藏亚贵拉含钼岩体锆石LA-ICP-MS年龄和地质意义 |
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| 引用本文： | 李奋其 高,明 唐文清 梁,婷.西藏亚贵拉含钼岩体锆石LA-ICP-MS年龄和地质意义[J].中国地质,2010,37(6):1566-1574. |
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| 作者姓名： | 李奋其 高 明 唐文清 梁 婷 |
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| 作者单位： | 中国地质调查局成都地质矿产研究所;河南省地质调查院;地质过程与矿产资源国家地质重点实验室; |
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| 基金项目： | 中国地质调查局地质大调查项目 |
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| 摘 要： | 冈底斯带东段的念青唐古拉地区除了发育许多大中型铅锌矿床外,还发育大型钼矿床,前者被认为是始新世成矿作用的产物,后者则被认为是古新世斑岩型钼矿床。在该区规模最大的亚贵拉铅锌矿床评价过程中,不仅发现铅锌矿化与石英斑岩体关系密切,而且在岩体内发现了规模较大的辉钼矿脉。应用LA-ICP-MS对石英斑岩锆石微区U-Pb年龄和微量元素进行了测定,90%的测点Th/U比值较高,阴极发光图像显示锆石内部发育明显的环带构造,具岩浆成因特点。2件石英斑岩样品的锆石206Pb/238U加权平均年龄分别为(65.8±1.3)Ma(MSWD=3.0)、(68.6±1.7)Ma(MSWD=1.8),表明岩体形成于晚白垩世。在野外实地调研的基础上,结合石英斑岩体微量元素含量以及前人对钼矿体的辉钼矿Re-Os年龄测定,认为辉钼矿化、铅锌矿化均与石英斑岩岩浆热液密切相关,但亚贵拉钼矿化与沙让斑岩钼矿化有别。念青唐古拉地区在晚白垩世可能发生铅锌成矿作用以及钼成矿作用。
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| 关 键 词： | 亚贵拉 钼矿化 LA-ICP-MS定年 石英斑岩 晚白垩世 |
U-Pb zircon LA-ICP-MS age of the Yaguila molybdenum-bearing intrusion in Tibet and its geological significance |
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| LI Fen-qi,GAO Ming,TANG Wen-qing,LIANG Ting.U-Pb zircon LA-ICP-MS age of the Yaguila molybdenum-bearing intrusion in Tibet and its geological significance[J].Chinese Geology,2010,37(6):1566-1574. |
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| Authors: | LI Fen-qi GAO Ming TANG Wen-qing LIANG Ting |
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| Institution: | LI Fen-qi1,GAO Ming2,TANG Wen-qing1,LIANG Ting3(1.Chengdu Institute of Geology and Mineral Resources,China Geological Survey,Chengdu 610081,Sichuan,China,2.Geological Survey of Henan Province,Zhengzhou 410059,Henan,3.State Key Laboratory of Geological Processes and Mineral Resources,Wuhan 430074,Hubei,China) |
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| Abstract: | There exist a large number of large and medium-sized lead-zinc deposits as well as a large-sized molybdenum deposit in Nyainqentanglha region of eastern Gangdise.The former deposits are considered to be products of Eocene mineralization,whereas the latter deposit is regarded as a Paleocene porphyry deposit.In the process of the evaluation of the Yaguila ore deposit,which is the largest lead-zinc deposit in the Gangdise metallogenic belt,the authors found that lead-zinc mineralization is closely related to t... |
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| Keywords: | Yaguila molybdenum mineralization dating of LA-ICP-MS quartz porphyry late Cretaceous |
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