Abstract
Native copper in basalt copper deposits in NE Yunnan, SW China, formed in fissures of basalt or in carbonaceous sedimentary interbeds of basalt together with organic matter such as bitumen. The mineral fills in fissures of bitumen and replaces plant fragments. Bitumen is of organic origin, with its_δ13CV-PDB values ranging from −27.3 to_−33.1‰. The 40Ar-39Ar ages of the gangue minerals zeolite and actinolite in copper ores are 226 to 238.6 Ma and 134 to 149.1 Ma respectively, indicating the occurrence of two copper mineralization stages. All these suggest that the copper mineralization is of epigenetic hydrothermal origin.
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Li, H., Mao, J., Chen, Y., Wang, D., Zhang, C., Xu, H. (2005). Epigenetic hydrothermal features of the Emeishan basalt copper mineralization in NE Yunnan, SW China. In: Mao, J., Bierlein, F.P. (eds) Mineral Deposit Research: Meeting the Global Challenge. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27946-6_39
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DOI: https://doi.org/10.1007/3-540-27946-6_39
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