北阿尔金地区大平沟金矿H-O-S-Pb同位素地球化学特征对金矿成因的启示

doi:10.13278/j.cnki.jjuese.20180209

Abstract

Abstract: Dapinggou gold deposit is one of the typical gold deposits in Northern Altun. The deposit is characterized by K-feldspar quartz vein-type and altered rock-type mineralization. The gold mineralization occurs within near the E-W ductile shear zone with the K-feldspar leptynite of Archaean Milan Group as the principal host rock. The ore minerals are mainly pyrite, with minor limonite and natural gold. The measured δ¹⁸O_VSMOW values for the gold-bearing quartz range from 12.4‰ to 15.3‰, the estimated δ¹⁸O_H2O fluid values range from 7.4‰ to 10.3‰, and the δD_VSMOW values of fluid inclusions in quartz range from-97‰ to -66‰, indicating that the ore-forming fluid is dominated by metamorphic sources. The δ³⁴S_VCDT values of sulfide minerals range from 6.9‰ to 8.3‰ in accordance with those of the typical orogenic gold deposits. The ²⁰⁶Pb/²⁰⁴Pb ratios of sulfides range from 18.310 1 to 19.373 9, ²⁰⁷Pb/²⁰⁴Pb ratios from 15.587 2 to 15.654 1, and the ²⁰⁸Pb/²⁰⁴Pb ratios from 38.119 1 to 39.143 9, indicating the lead source of sulfide the same as the orogenic type. It is proposed that Dapinggou gold deposit can be classified as the orogenic gold deposit, the gold formation is controlled by the near EW secondary fault and the ductile shear zone, the metallogenic material is derived from the Archaean metamorphic rocks, and the ore-forming fluids are mainly metamorphic fluids.

Key words: isotopic geochemistry, orogenic gold deposit, Dapinggou gold deposit, northern Altun

CLC Number:

P597

Lei Ruxiong, Zhao Tongyang, Li Ping, Dong Lianhui, Li Jihong, Wu Changzhi. H-O-S-Pb Isotopic Geochemistry of Dapinggou Gold Deposit in Northern Altun and Its Implications for Ore Genesis[J].Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1578-1590.

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H-O-S-Pb Isotopic Geochemistry of Dapinggou Gold Deposit in Northern Altun and Its Implications for Ore Genesis

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