Abstract
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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Acknowledgments
This research was financially supported by the Major State Basic Research Program of the People’s Republic of China (No.2006CB403507 and 2006CB403506). We appreciate the engineers of the Jiguanshan Mine for their help and fruitful discussion during our field investigations. F Wang, HQ Sang, LK Yang, and YL Wang are also thanked for their help with 40Ar/39Ar ages analyses. Mr. Nathan Cleven and Prof. Zhenhao Duan are especially thanked for their helpful suggestions on earlier drafts of this paper and for language improvement. Special thanks are due to Fernando Barra, David Selby, and Ryan Mathur for carefully reviewing the manuscript and for their constructive comments and editing suggestions. Bernd Lehmann is also greatly appreciated for constructive comments and suggestions.
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Wu, H., Zhang, L., Wan, B. et al. Re–Os and 40Ar/39Ar ages of the Jiguanshan porphyry Mo deposit, Xilamulun metallogenic belt, NE China, and constraints on mineralization events. Miner Deposita 46, 171–185 (2011). https://doi.org/10.1007/s00126-010-0320-9
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DOI: https://doi.org/10.1007/s00126-010-0320-9