| 南天山萨恨托亥—大山口—带穆龙套型金矿地质及地球化学特征 |
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| 关键词:Muruntau type gold deposit turbidite geology geochemistry Sahentuohai Dashankou metallogenic province South Tianshan Mountains |
| 基金项目:国家305科技攻关项目(编号969150403) |
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| Geology and Geochemistry of the Muruntau Type Gold Deposits in the Sahentuohai-Dashankou Metallogenic Province, South Tianshan Mountains,China |
| Geological and geochemical characteristics of two typical gold deposits,Dashankuo and Sahentouhai,were studied, and the result shows that the deposits are controlled by the brittle ductile shear zones in northwestern zonal distribution in Dashakou Group. Gold orebodies in steady orientation consists of auriferous quartz veins and auriferous mylonite. Two types of gold ores can be distinguished: one is mylonite type with merely small amounts of sulfides, whereas the other is quartz vein type. The main alterations in the host rock include silicification, sericitization and ferrodolomitization. Two forms of mineralization can be defined, namely hydrothermal infiltration metasomatism and hydrothermal infilling. The formation of gold ores can be divided into two stages, i.e., Au mylonite stage and Au_quartz vein stage. The ore vein ores contain abundant fluid inclusions which consist mainly of gas-liquid NaCl H 2O.Ore forming fluids are rich in Cl-, SO 2-4,CO 2, Na+ and K+, with w (NaCl eq ) of 0.85% to 9.9%. In the mineralizing stage, the density is 0.5611～0.9718 g/cm 3, f O 2 10 -41 ～10 -27, f S 2 10 -5 ～10 -20. The ores were formed at the temperature of 170～460 ℃ and under the pressure of 0.94 MPa to 32.2 MPa. According to characteristics of the stable isotopes C,H,O in ore forming solution and the comparison of Pb,S isotopes between gold ores and host rocks, the ore forming fluids consisted of deep-seated source ore solution, magmatic solution and underground water. The gold deposits created and controlled by brittle ductile shear zones in the metallogenic province have a close spatial,temporal and genetic relation to brittle ductile shear zones. They are Muruntau type deposits. |
| MENG Xiang-jin,YE Jin-hua,WANG Li-ben.2000.Geology and Geochemistry of the Muruntau Type Gold Deposits in the Sahentuohai-Dashankou Metallogenic Province, South Tianshan Mountains,China[J].Acta Geoscientica Sinica,21(4):379-388. |
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