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Os-Os DATING OF COPPER AND MOLYBDENUM DEPOSITS ALONG THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER, CHINA

Weidong Sun^*, Zhi Xie, Jiangfeng Chen and Xun Zhang

Laboratory for Chemical Geodynamics, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, P. R. China

Zifang Chai

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, P. R. China

Andao Du

Institute of Rock and Mineral Analysis, Chinese Academy of Geological Sciences, Beijing 100037, P. R. China

Junshen Zhao

812 Branch, Institute of Geology and Exploration of Eastern China, Tongling 244008, P. R. China

Chenghuo Zhang

321 Geological Survey Party, Department of Land and Resources of Anhui Province, Tongling 244033, P. R. China

Taofa Zhou

Department of Environment and Resources, Hefei University of Technology, Hefei 230009, P. R. China

Corresponding author: email,cjf{at}ustc.edu.cn

The ¹⁸⁶Os-¹⁸⁷Os and ¹⁸⁸Os-¹⁸⁷Os dating techniques were modified and applied to molybdenites from two Cu vein deposits and three Mo skarn deposits along the middle and lower reaches of the Yangtze River, China. The results show that these deposits formed at 138 to 133 Ma, identical to the ages of 140 to 130 Ma for the host granitoids. Re-Os and Os-Os ages of two of the samples agree within analytical uncertainties. The close temporal relationship between the granitoid intrusions and the formation of the deposits supports a magmatic model for the origin of these deposits. The results show that the novel Os-Os dating technique is capable of resolving geologic problems, although the accuracy obtained by the present work (1–2%) is lower than that of the Re-Os method.

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