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Types of Basin Fluids, Mechanism of Discolored Alterations and Metal Mineralizations of Glutenite-type Cu-Pb-Zu-U Deposits in Intercontinental Red-bed Basin of the Western Tarim Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2017年第05期
Page:
585-619
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Types of Basin Fluids, Mechanism of Discolored Alterations and Metal Mineralizations of Glutenite-type Cu-Pb-Zu-U Deposits in Intercontinental Red-bed Basin of the Western Tarim Basin
Author(s):
FANG Wei-xuan JIA Run-xing WANG Lei
China Non-ferrous Metals Resource Geological Survey, Beijing 100012, China
Keywords:
basin fluid mechanism of geochemical lithofacies discolored bituminization carbonatization redox interface Cu-Pb-Zn-U deposit Tarim Basin 
PACS:
P595;P618;P619.14
DOI:
-
Abstract:
Co-enrichment of Cu-Pb-Zn-coal-oil-gas deposits in the basin exhibits in Mesozoic-Cenozoic intercontinental redbed basin of the northwestern Tarim Basin. Based on the methods of tectonic lithofacies and geochemical facies, the relationships among the types of basin fluids, discolored mechanism and metal mineralization were studied. Basin fluids may be classified into the nine types of gas, oil-gas, brine, hydrothermal sedimentary, hydrocarbon-rich with extensive reductibility, CO2-rich nonhydrocarbon fluid, tectonic fluid, magmatic hydrotherm and interlayer to confined-water. Five types of hydrothermal sedimentary, high-salinity brine, Fe-Mn-CO2-rich fluid, magmatic hydrotherm and hydrocarbon-rich with extensive reductibility, undergo the extensive physical coupling among tectonics-lithofacies-lithology during the late cataclastic lithification phase and basin deformations. At the same time, the chemical coupling reactions are taken place. “Black-first, white-second, and discolored-third” is named for extensive alterations of the basin fluid in the mechanism of the geochemical lithofacies, resulting in most of Fe3+ into Fe2+ for the discolored alterations in the amaranthine irony conglomerate. Bituminization alteration facies may be classified into the extensive black bituminization zone, the middle gray-black bituminization zone and the weak bituminization-discolour zone; carbonatization alteration facies may be classified into the extensive, the middle, and the weak carbonatization zones. Nonmiscibility of hydrocarbon-bearing brine, liquid hydrocarbon, gas hydrocarbon and gas-phase CO2, and multiple phases of nonmisciblity for hydrocarbon-bearing brine, gas hydrocarbon, liquid hydrocarbon, gas-liquid hydrocarbon, light oil and asphalt, might have resulted in enrichments and depositing of minerals. The escape of gas-phase CO2 could be pyrohydrolysized in carbonatization alteration facies and enrichments and depositing of minerals. Geochemical redox interfaces resulted in mineralizations may be indicated by hydrocarbonrich with extensive reductibility, Ca-Mg-Fe-Mn-CO3 acid reducing metallogenic fluid, and intergrowth of hematite and Fe-chalcocite. However, Pb-Zn-bearing gypsum celestine ores might have been formed by Ca-Sr-Ba-SO4-type hydrothermal sediment with strongly acidic and oxidizing. All of these mechanisms of the geochemical lithofacies could be assumed that the discolored alterations at the large-scale are not only for the amaranthine irony conglomerates to sandstones, but also for glutenite-type Cu-Pb-Zn-U and sandstone-type Cu metallogenic belt in Mesozoic-Cenozoic continental red-bed basin of the western Tarim Basin.

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Last Update: 2017-10-19