| 甘肃金川硫化铜镍矿床地质特征 |
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| 引用本文：.1986.Eological Characteristics Of The Jinchuan Cu-Ni Sulfide Deposit In Gansu Province[J].Mineral Deposits,5(1):27~38 |
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| Eological Characteristics Of The Jinchuan Cu-Ni Sulfide Deposit In Gansu Province |
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| Abstract:The Jinchuan mine is a Cu-Ni sulfide deposit of remarkable economic significance. ln addition to abundant major elements Cu and Ni, it has quite a lot of valuable associated elements. This deposit has many unique characteristics different form other deposits of the same type both at home and abroad in geologic setting and mineralizations. For instance, it has relatively young metallogenic epochs and multiple rock-forming phases and stages; lithologically, there are merely plagioclase-bearing ultrabasic rocks occurring as dykes and characterized by especially good ore potential; the deposit is of multiple ore-forming stages and geneses, with the main type being deep-seated magmatic differentiation by liquation-ore magma injection orebodies, accompanied by commercial contact-metasomatic orebodies related to ultrabasic bodies and hydrothermal-superimposed Pt (Pd) orebodies or occurrences; potassium-bearing nickel minerals which have never been reported are observed. The deposit occurs at the southeastern marginal uplift of the Alxa platform, and the ore-bearing ultrabasic rocks with K-Ar isotopic ages of 1510 Ma and 1530 Ma are within high-grade metamorphic rocks of Archaeozoic Baijiazuizi Formation. Orebodies of this deposit are all genetically associated with this ultrabasic body. Mineralization can be divided into three stages: magmatic, pneumato-hydrothermal and hydrothermal stages. Orebodies might be grouped mto five types: magmatic differentiation by liquation orebodies, deep-seated magmatic differentiation by liquation-ore magma injection orebodies, late stage ore magma injection and contact-metasomatic orebodies, and hydrothermal-superimposed orebodies or occurrences. |
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