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引用本文:黄 勇1,3 唐菊兴2 丁 俊3 张 丽3 郎兴海1. 西藏雄村斑岩铜矿床辉钼矿Re-Os同位素体系[J]. 中国地质, 2013, 40(1): 302-311.
HUANG Yong1,2, TANG Ju-xing3, DING Jun2, ZHANG Li2, LANG Xing-hai1. The Re-Os isotope system of the Xiongcun porphyry copper-gold deposit, Tibet[J]. Geology in China, 2013, 40(1): 302-311(in Chinese with English abstract).
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西藏雄村斑岩铜矿床辉钼矿Re-Os同位素体系
黄 勇1,3 唐菊兴2 丁 俊3 张 丽3 郎兴海11,2,3
1 .成都理工大学,四川 成都 610059;2.中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京 100037;3 .中国地质调查局成都地质调查中心,四川 成都 610081
摘要:
提要:辉钼矿Re-Os同位素测年是现今研究斑岩铜矿成矿时限最有效的手段。本文通过开展冈底斯成矿带雄村斑岩铜金矿辉钼矿Re-Os同位素年代学研究,并结合前人已发表的数据,认为雄村斑岩铜金矿床成矿时限为171~175 Ma。Ⅰ号矿体可能受到始新世大规模的岩浆活动扰动,辉钼矿在经历过后期热事件影响,在辉钼矿中形成有极微量富Re的K-硅酸盐矿物,Ⅰ号矿体辉钼矿Re含量比Ⅱ号矿体以及Ⅲ号矿体中辉钼矿Re含量高出1~4倍,其Re-Os同位素年龄比真实年龄偏低,不能完全代表成矿年龄。同时通过与冈底斯成矿带斑岩-矽卡岩铜钼矿床,钼/钼铜矿床的对比研究后发现,雄村斑岩铜金矿中辉钼矿Re含量比同一成矿带上中新世斑岩铜钼矿床中辉钼矿Re含量高出一个数量级,比古新世—始新世斑岩钼矿/钼铜矿床中辉钼矿Re含量高出两个数量级。辉钼矿Re含量变化特征与成矿物质的来源、钼的浓度、成矿母岩组分以及成矿期间的物理/化学条件有关。
关键词:  Re-Os 同位素  斑岩铜金矿床  岛弧型  雄村  冈底斯  西藏
DOI:
分类号:
基金项目:国家自然科学基金(41172077)、中国地质调查局地质大调查项目(1212011221073)共同资助。
The Re-Os isotope system of the Xiongcun porphyry copper-gold deposit, Tibet
HUANG Yong1,2, TANG Ju-xing3, DING Jun2, ZHANG Li2, LANG Xing-hai11,2,3
1. Chengdu University of Technology, Chengdu 610059, Sichuan, China;2. Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China;3. MLR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Beijing 100037, China
Abstract:
Abstract:Re-Os dating of molybdenite is an efficient means to restrict the time of mineralization. The age of mineralization of the Xiongcun porphyry copper-gold deposit is confined between 171 Ma and 175 Ma based on this study and other data available. No.Ⅰ ore body of the Xiongcun deposit was affected by later magmtic thermal event. Molybdenite contains trace K-Si silicate enriched in Re. As a result of this event, the Re content of molybdenite is one to four times higher than that of molybdenite in No.Ⅱ ore body and No. Ⅲ ore body, and the age of molybdenite in No.Ⅰ ore body is younger than the real age. The authors also compared the Re content of molybdenite between this deposit and other porphyry-skarn deposits within this belt and found that the content of Re shows systematic variation. The Re content of the Xiongcun porphyry copper-gold deposit is one order of magnitude high than that of Miocene porphyry deposits and two order of magnitude higher than Paleocene to Eocene porphyry-skarn deposits. The Re variation is related to the source of metal, the content of molybdenum, the composition of magma and the physical/chemical condition of magmatic-hydrothermal solution.
Key words:  Re-Os isotope  porphyry copper-gold deposit  Xiongcun  Gangdise  Tibet