The role of CO2 in the genesis of Dabie-type porphyry molybdenum deposits

Zi-Qi Jiang, Lin-Bo Shang (), A. E. Williams-Jones, Xin-Song Wang (), Li Zhang, Huai-Wei Ni, Rui-Zhong Hu and Xian-Wu Bi
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Zi-Qi Jiang: Chinese Academy of Sciences
Lin-Bo Shang: Chinese Academy of Sciences
A. E. Williams-Jones: McGill University
Xin-Song Wang: Chinese Academy of Sciences
Li Zhang: University of Science and Technology of China
Huai-Wei Ni: University of Science and Technology of China
Rui-Zhong Hu: Chinese Academy of Sciences
Xian-Wu Bi: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Porphyry-type molybdenum deposits, many of which are in China, supply most of the World’s molybdenum. Of particular importance are the molybdenum deposits located in the Qinling-Dabie region that are responsible for more than half of China’s molybdenum production. A feature that distinguishes this suite of deposits from the better-known Climax and Endako sub-types of porphyry molybdenum deposits is their formation from CO2-rich magmatic-hydrothermal fluids. The role of CO2, if any, in the transport of molybdenum by these fluids, however, is poorly understood. We conducted experiments on the partitioning of molybdenum between H2O-CO2, H2O-NaCl, and H2O-NaCl-CO2 fluids and a felsic melt at 850 °C and 100 and 200 MPa. Here we show that the exsolution of separate (immiscible) brine and vapor leads to the very high brine DMo values needed for efficient extraction of Mo from the magmas forming Dabie-type porphyry molybdenum deposits.

Date: 2024
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DOI: 10.1038/s41467-024-49275-0

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