Geochemistry of Cherts from Shewushan Gold Ore Deposit  in Jiayu, Hubei Province and Its Metallogenic Environmental Constraints

Abstract

Abstract:

The Shewushan gold deposit is the largest lateritetype gold ore deposit in Asia, and authors discover that cherts covered on the top of the red soil in the gold ore deposit, showing a gradual transition relationship with the silicified limestone. The analysis of cherts approves that the SiO₂ content is from 96.87% to 97.90%，and that the Si/Al ratio ranges from 92.84 to 287.66 with average value of 173, therefore, the cherts could be classified as pure cherts. The Al/(Al+Fe+Mn)ratios of chert samples in the research area are between 0.189 and 0.388,and the average value is 0.303, implying that the cherts is of hydrogenous genesis. AlFeMn diagram shows that the cherts is also hydrothermal type，and the ratios of Ni/Co, Fe/Ti, Ti/V and U/Th show that cherts from Shewushan are hydrothermally sedimentary origin. The ratios of Ce/Ce* and(La/Ce)N is 1.05-1.27 and 0.84-1.12 with average value of 1.12 and 0.98, respectively. The trace element V content is 3.02-4.26 μg/g and the ratio of MnO/TiO₂ is 1.0-2.0, which indicated that the radiolarian chert formed in transitional environment of continental margin basin. Combining with the macro characteristics, we regard that cherts probably formed in the Carlin type golds stage of eliminate carbonatization, which are the product of hydrothermal activity.

Key words: geochemistry, depositional setting, Shewushan gold ore deposit, Hubei

XU Meng-Meng, XU An-Dong, SUN Xiang-Min, SHU Ben-Jie, LIU Wen-Guang, XIAO Fan, HU Rong-Ke, XU Yong-Li, LI Bao-Qiang. Geochemistry of Cherts from Shewushan Gold Ore Deposit in Jiayu, Hubei Province and Its Metallogenic Environmental Constraints[J]. Geoscience, 2012, 26(2): 269-276.

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Geochemistry of Cherts from Shewushan Gold Ore Deposit in Jiayu, Hubei Province and Its Metallogenic Environmental Constraints

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