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• W2390291216 abstract "Magmatic-hydrothermal transitional processes are of critical importance for the formation of intrusion-centered hydrothermal ore deposits. Although some aspects of the early magmatic stage and the subsolidus hydrothermal stage are relatively well understood, much less is known about the transition stage, i.e., the interval between the initiation of fluid exsolution from a crystallizing melt and the final solidification of magma. The studies on the exsolution and evolution of magmatic hydrothermal fluids and their constraints on metallic ore formation, by means of microthermometry, in-situ nondestructive quantitative analyses of individual fluid and melt inclusions, experiments on partitioning of volatiles and ore metals among different phases and mass transfer modeling, have made enormous progresses over the last ten years. In this paper, some advances of knowledge in this field are described, including the exsolution and evolution of magmatic hydrothermal fluids and their constraints on metallic ore formation, the partitioning of volatiles and ore-forming metals among different phases, and the relationships between ore-forming fluids and metallic ore formation in porphyry copper and high sulfidation epithermal deposits etc. Some conclusions can be drawn as follows:(1) Magmatic melt contains abundant volatiles enough to form hydrothermal solution and the volatiles exsolved from magmatic melt can be trapped in fluid inclusions, being the direct evidence of exsolving hydrothermal solution from magmatic melt. (2) The volatiles, trace metals and other elements may partition among crystallizing melt, saline aqueous solution, gas phases and minerals. The latest researches show that copper is several hundred times more concentrated in magmatic vapor than in coexisting magmatic melt and that Cu, As and Au (probably as HS complexes) preferentially partition into the vapor phase in a coexisting liquid brine. (3) The partitioning coefficients of ore metals among melt, fluid and gas are controlled by the ratio of initial water in the melt to the water saturation level, w(Cl)/w(H 2O) and w(F)/w(Cl) ratios in magmatic melt and exsolving aqueous fluid. (4) The porphyry copper deposits have a distinct assemblage of fluid inclusions, characterized by halite-bearing inclusions, vapor-rich inclusions, and the common occurrence of chalcopyrite daughter minerals in inclusions. The ore-forming fluid and ore metals are mainly derived from magmatic melt.(5) Epithermal deposits share certain similarities in the evolution of ore-forming fluids with porphyry copper deposits, which indicates a genetic link between these two types of ore deposits. Finally, a great deal of inspiration and provocation on studies of ore deposits related magmatic hydrothermal fluids in our country has been gained from the above-mentioned." @default.
• W2390291216 created "2016-06-24" @default.
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• W2390291216 date "2001-01-01" @default.
• W2390291216 modified "2023-09-25" @default.
• W2390291216 title "EXSOLUTION AND EVOLUTION OF MAGMATIC HYDROTHERMAL FLUIDS AND THEIR CONSTRAINTS ON THE PORPHYRY ORE-FORMING SYSTEM" @default.
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