Re–Os and 40Ar/39Ar ages of the Jiguanshan porphyry Mo deposit, Xilamulun metallogenic belt, NE China, and constraints on mineralization events

被引：0
作者：
Huaying Wu
Lianchang Zhang
Bo Wan
Zhiguang Chen
Peng Xiang
Franco Pirajno
Andao Du
Wenjun Qu
机构：
[1] Chinese Academy of Sciences,Key Laboratory of Mineral Resources, Institute of Geology and Geophysics
[2] Graduate University of Chinese Academy of Sciences,School of Earth and Environment
[3] University of Western Australia,undefined
[4] National Research Center of Geoanalysis,undefined
来源：
Mineralium Deposita | 2011年 / 46卷
关键词：
Re–Os; Molybdenite; Ar/; Ar dates; Jiguanshan porphyry Mo deposit; Xilamulun metallogenic belt; Northeast China;
D O I：
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中图分类号：
学科分类号：
摘要：
The large Jiguanshan porphyry Mo deposit, with more than 100 Mt of ore and grades ranging from 0.08% to 0.11%, is located in the newly identified Xilamulun metallogenic belt along the northern margin of the North China Craton. The Mo mineralization is predominantly disseminated in the host granite porphyry, but locally occurs as stockworks in lithic tuff and rhyolitic rocks. 40Ar/39Ar dates of samples from groundmass material in the host granite porphyry, post-ore diabase, and quartz porphyry dikes show plateau ages of 155.1 ± 1.9, 149.4 ± 0.9, and 147.6 ± 0.9 Ma, with inverse isochron ages of 156.0 ± 1.8, 149.3 ± 1.3, and 148.3 ± 1.2 Ma, respectively. Seven samples of disseminated molybdenite yielded a weighted average 187Re-187Os age of 155.3 ± 0.9 Ma, whereas six veinlet-type molybdenite samples yielded a weighted average 187Re-187Os age of 153.0 ± 0.9 Ma, providing direct timing constraints for the Mo mineralization at 153–155 Ma. The regional geological setting together with the emplacement of post-ore diabase and quartz porphyry dikes in the Jiguanshan deposit, are indicative of an extensional regime in Late Jurassic, which was probably linked to lithospheric extension in northeast China.
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页码：171 / 185
页数：14
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