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- W2386416488 abstract "Machangqing polymetallic deposit is one of the typical copper-molybdenum deposits,which are related to alkaline-rich porphyry in Himalaya period in the tectonic belt of Jingshajiang-Ailaoshan,Yunnan Province.Ore bodies(lodes) coexist with alkaline-rich porphyry(vein) in space,are similar to or slightly younger than but are genetically related to the latter.The zonations of alteration type and ore-formation are clear: porphyry-type copper-molybdenum,mainly molybdenum mineralization in the rock body;contact-metasomatism-type copper-molybdenum-gold-iron,mainly copper-iron and weak gold mineralization in the contact between surrounding rock and the rock body;gold-lead-zinc mineralization in the wallrock far from the contact.The phase assemblage of inclusions becomes gradually simpler,with decreasing temperatures,salinity and ore-forming pressures from the Machangqing ore segment→Luandongshan→Rentouqing→Jinchangqing(ore segment),indicating gradually shallower mineralization depths.Isotope geochemistry reveals that polymetallic deposits,such as copper,molybdenum and gold,are the products of the same mineralizing system of magma and fluid in different physicochemical conditions,and that with the process of fluid ore-formation,mineralization took place from the inner porphyry body,through the contact zone to the wallrock.Consequently,the role of alkaline-rich magma and mantle fluid decrease with increasing effect from wallrock,and the component of fluid evolved from 2010 年 mantle-derived,crust-mantle-mixed to crust-dominant.Finally,this paper discusses the ore-forming mechanism of the Machangqing copper-molybdenum-gold polymetallic deposit,and preliminary predict that the ore-forming potentiality in deeper depths is promising." @default.
- W2386416488 created "2016-06-24" @default.
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- W2386416488 date "2010-01-01" @default.
- W2386416488 modified "2023-09-26" @default.
- W2386416488 title "Geologic, geochemistry characteristics and ore-forming mechanism of Machangqing polymetallic deposit, Yunnan Province" @default.
- W2386416488 hasPublicationYear "2010" @default.
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