Fluid Inclusion Studies of Gold Deposits in the Gezhen Shear Zone,Hainan Province,China |
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摘 要: |
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关 键 词: | 金矿床 地球化学 流体包裹体 海南 前寒武纪 剪切带 |
Fluid inclusion studies of gold deposits in the Gezhen shear zone,Hainan Province,China |
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Authors: | Yong Xia Xueyi Wu Yuangen Yang |
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Institution: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang |
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Abstract: | The Tuwaishan, Baoban, Erjia, Bumo and other gold deposits in western Hainan occur in Precambrian metamorphic clastic rocks
and are structurally controlled by the Gezhen shear zone. Fluid inclusion studies have been carried out of the gold deposits
mentioned above. The homogenization temperatures of the whole fluid inclusion population range from 140°C to 370°C, indicating
that gold was precipitated mainly at 240–250°C. The salinities are within the range of 2.0–9.2 wt% NaCl equiv. and the pressure
of formation of the deposits was estimated at about 270×105−500×105Pa, corresponding to a depth of about 1.1–2.0 km under lithostatic confinement. Chemical studies show that the ore fluid is
of the Na+(K+)-Ca2+-Cl−(F−) type. Theδ
18O andδD values of the fluid vary from −2.7‰- +4.4‰ and −50‰–−87‰ Evidence developed from fluid inclusions and geological setting
indicates that the ore fluid was a mixture of magmatic and meteoric-hydrothermal waters. Changes in chemical composition andδ
18O andδD of fluid inclusions from one ore field to another seem to be related with regional tectonism, metamorphism and magmatism. |
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Keywords: | gold deposit geochemistry of fluid inclusions metallogenesis Precambrian Hainan Province |
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