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- W2392164908 abstract "Three types of deposit found in Machangqing ore field:porphyry-type copper-molybdenum deposit is in the Machangqing complex intrusion,contact-metasomatic-type copper-molybdenum(iron) deposit in inner and outside the contact between strata and the intrusion and epithermal gold-lead-zinc deposit in outside strata.Wallrock alteration zonation is clear,from the center of intrusion to outside,showing strong silicification → quartz,K-feldspar → quartz,K-feldspar,sericitization → skarn → low-middle-temperature hydrothermal alteration.Isotope-dating shows the metallogenesis age of three types of deposit is 33.7 ～ 35.8Ma,and gold deposit is slightly later the copper-molybdenum deposit,according with the intrusion age(33 ～ 37Ma).H,O,Pb,S isotopes and fluid inclusions suggest that from porphyry copper-molybdenum deposit → contact-metasomatic copper-molybdenum(iron) deposit → epithermal gold-lead-zinc deposit,homogeneous temperatures,salinities of fluid inclusion and homogeneous pressures are decreasing trendingly.The metals and fluid for ore-forming are mainly from the magma system in the early in porphyry-type copper-molybdenum deposit,and change into wallrock and precipitate water in later in epithermal gold-lead-zinc deposit.The relationships of time,space and material of different types of deposit insinuate they are products of different envolution stages of same source magma.Physics and chemical characteristics and migration conditions of hydrothermal determine different deposit types occurring different positions.A metallogenic system consist of porphyry-type and epithermal copper-molybdenum-gold ploymetal related to alkalic-rich porphyry is built up in this paper." @default.
- W2392164908 created "2016-06-24" @default.
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- W2392164908 date "2012-01-01" @default.
- W2392164908 modified "2023-09-25" @default.
- W2392164908 title "Epithermal-porphyry Cu-Mo-Au ploymetal metallogenic system in Machangqing ore field,Yunnan" @default.
- W2392164908 hasPublicationYear "2012" @default.
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