Hydrothermal alteration processes in the giant Dahutang tungsten deposit,South China:Implications from litho-geochemistry and mass balance calculation

Hai-Bo Zhao; Yong Zhang; Lei Liu

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Hydrothermal alteration processes in the giant Dahutang tungsten deposit,South China:Implications from litho-geochemistry and mass balance calculation

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The giant Dahutang tungsten(W)deposit has a total reserve of more than 1.31 Mt WO3.Veinlet-disseminated scheelite and vein type wolframite mineralization are developed in this deposit,which are related to Late Mesozoic biotite granite.Four major types of alterations,which include albitization,potassic-alteration,and greisenization,and overprinted silicification developed in contact zone.The mass balance calculate of the four alteration types were used to further understanding of the mineralization process.The fresh porphyritic biotite granite has high Nb,Ta,and W,but low Ca and Sr while the Jiuling granodiorite has high Ca and Sr,but low Nb,Ta,and W concentrations.The altered porphyritic biotite granite indicated that the Nb,Ta,and W were leached out from the fresh porphyritic biotite granite,especially by sodic alteration.The low Ca and Sr contents of the altered Neoproterozoic Jiuling granodiorite indicate that Ca and Sr had been leached out from the fresh granodiorite by the fluid from Mesozoic porphyritic biotite granites.The metal W of the Dahutang deposit was mainly derived from the fluid exsolution from the melt and alteration of W-bearing granites.This study of alteration presents a new hydrothermal circulation model to understand tungsten mineralization in the Dahutang deposit.

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《中国地质（英文）》 |2021年第002期|230-244|共15页
作者
Hai-Bo Zhao; Yong Zhang; Lei Liu;
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Zhengzhou Institute of Multipurpose Utilization of Mineral Resources Chinese Academy of Geological Sciences Zhengzhou 450006 China;

Northwest China Center for Geoscience Innovation Xi'an 710054 China;

State Key Laboratory of Nuclear Resources and Environment East China University of Technology Nanchang 330013 China;

Institute of Geological Survey of East China University of Technology Nanchang 330013 China;

Zhengzhou Institute of Multipurpose Utilization of Mineral Resources Chinese Academy of Geological Sciences Zhengzhou 450006 China;

Northwest China Center for Geoscience Innovation Xi'an 710054 China;

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Hydrothermal alteration processes in the giant Dahutang tungsten deposit,South China:Implications from litho-geochemistry and mass balance calculation

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