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- W2368400054 abstract "The Talate Pb-Zn deposit,located on the southeast limb of the Kelan volcanic-sedimentary basin in the Altay,is hosted in the metamorphic rock series of the upper second lithological section of Lower Devonian Lower Kangbutiebao formation( D1k12),and its disposition and occurrence are controlled by the regional NW fault,the Keyingong fault and the Abagong fault. The Pb-Zn ore bodies occur as stratabound deposit,with the overprints of late sulfide-quartz veins. There were two obvious mineralization periods based on ore occurrences that are submarine volcanic sedimentary exhalation and metamorphic hydrothermal superimposition.Considering mineral assemblages and crosscutting relations of veins,metamorphic overprints could be divided into two stages. In the early stage,bedding lentoid quartz veins distributed in the chlorite schist and the leptite of the ore-bearing horizon. The appearance of disseminated pyritization and the phenomenon that layered sphalerite were replaced by pyrite and chalcopyrite is obvious under the microscope. In the late stage,pyrite-chalcopyrite quartz veins cut chlorite schist and leptite or the massive Pb-Zn ores and sulfides are sparse and disseminated. Fluid inclusions in sphalerite of the submarine volcanic sedimentary exhalation contain residual L-V inclusions,secondary L-V inclusions and a spot of H2O-CO2 inclusions trapped in tiny fissures. Primary L-V inclusions have Th,tot=267 ~ 334℃,and secondary H2O-CO2 inclusions have Tm,CO2=- 61. 2 ~- 60. 2℃ and Th,CO2= 6. 5 ~ 11. 0℃. The fluid inclusions in early vein quartz of metamorphic period consist of a great number of H2O-CO2 inclusions,carbonic( CO2± CH4) inclusions and a few H2O-CO2-Na Cl inclusions. H2O-CO2 inclusions are homogenized at the temperature of 294 ~ 368℃,with salinities of 5. 5% ~ 7. 4%Na Cleqv. The carbonic inclusions have Tm,CO2of- 60. 1 ~- 58. 5 ℃,and Th,CO2of- 4. 2 ~ 20. 6 ℃. Fluid inclusions in late pyritechalcopyrite quartz veins consist of a great number of H2O-CO2 inclusions,CO2± CH4 inclusions,and secondary L-V inclusions. H2OCO2 inclusions have 142 ~ 360℃ of Th,totand 2. 4% ~ 16. 5% Na Cleqv of salinities. Carbonic inclusions have- 61. 5 ~- 57. 3℃ of Tm,CO2,- 27. 0 ~- 20. 6℃ and 27. 1 ~ 28. 7℃ of Th,CO2,and secondary L-V inclusions have- 9. 8 ~- 1. 3℃ of Tm,iceand 205 ~412℃ of Th,tot. Regional CO2-rich fluids came from the orogeny of the Kelan basin,and affected metamorphism of ores and wall rocks,as well as metal enrichment. Deformed and metasomatic textures of ore in the Talate deposit and abundant CO2-rich fluids may explain that metamorphic fluids participate in the superimposed reformation and possess characteristic of multi-stage. The P-T trapping conditions of CO2-rich fluids coincide with those of late or post regional metamorphism." @default.
- W2368400054 created "2016-06-24" @default.
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- W2368400054 date "2015-01-01" @default.
- W2368400054 modified "2023-09-26" @default.
- W2368400054 title "Metamorphic overprints on the Talate Pb-Zn deposit in Altay: Evidences from geology and fluid inclusions" @default.
- W2368400054 hasPublicationYear "2015" @default.
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