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- W2378637148 abstract "The Pulang porphyry copper deposit is located in the northern part of the Sanjiang area. Tectonically, it is located in the Zhongdian arc of the southern part of the Yidun island arc. It is a large to superlarge deposit and was formed in the process of the westward subduction of the Ganzi- Litang oceanic basin in Late Triassic. Various types of fluid inclusions have been observed or identified in the quartz veins of the deposit through microthermometric study and Laser Raman microspectroscopic analysis. They include the aqueous liquid- rich inclusions, the CO2- bearing three/two phase inclusions, and the daughter mineral- bearing multiphase inclusions basically. There are many kinds of daughter minerals, including halite, sylvinite, calcite, gypsum, chalcopyrite and hematite. Four kind of fluids trapped in various inclusions have been observed, that is, high salinity magmatic hydrothermal fluid, low salinity CO2- bearing fluid, intermediate salinity fluid and minor low salinity water. The high salinity magmatic hydrothermal fluid is characterized by homogenization temperatures of 457- 245 ℃ , calculated homogenization pressure of (259.33- 25.43)× 105 Pa, high salinities of 34% - 54% NaCl equiv. (possibly up to 70% NaCl equiv.), density of 1.12- 1.07 g/cm3, and high contents of Na, K, Ca, Cu, Fe, CO2, S and Cl. It is believed that the original magmatic fluid could be formed in the magma chamber due to the evolution of the intermediate- acidic magma, and then concentrated in the top part of the magma chamber. In the westward subduction process of the Ganzi- Litang oceanic basin, the magmatic fluid could be pulsatively upwelling, from the chamber under the fluid internal pressure and the main compressive force of the oceanic basin subduction, to provide continuous supply of ore- forming materials and heat source for the magmatic hydrothermal fluid system which was formed in the early magmatic movement during 226± 3 to 228± 3 Ma. It is also believed that the phase unmixing of the high salinity and CO2- bearing magmatic fluid could be the main reason resulted in the main mineralization in forms of quartz- sulfide veinlet stockwork and dissemination in the Pulang porphyry copper deposit." @default.
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- W2378637148 date "2007-01-01" @default.
- W2378637148 modified "2023-09-25" @default.
- W2378637148 title "Fluid inclusions in quartz veins of Pulang porphyry copper deposit, Zhongdian, northwestern Yunnan, China" @default.
- W2378637148 hasPublicationYear "2007" @default.
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