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The Eastern Qinling mineralizing belt of porphyry-type Mo deposits is located in the south margin of North China Platform. About 40% explored Mo resources of China are stored in that belt. Mo mineralization is related with Yanshanian (161-104Ma) small intermediate to acidic porphyry bodies. As the porphyry bodies intruded into Archean to middle Proterozoic carbonate rocks and alumino-silicate rocks, porphyry-type, sham-type and hornfels-type Mo ores were formed with different types of wallrock alteration. Ore-forming fluids are characterized by H_2O-CO_2-NaCl with lower to middle saline (0-l2.7% NaCl). Oxygen and hydrogen isotope data suggest that ore-forming fluid of the early stage is mainly magmatic water. Along with evolution of mineralization to late stage, ratio of magmatic water decreased and meteoric water added.
The Eastern Qinling mineralizing belt of porphyry-type Mo deposits is located in the south margin of North China Platform. About 40% explored Mo resources of China are stored in that belt. Mo mineralization is related with Yanshanian (161-104Ma) small intermediate to acidic porphyry bodies. As the porphyry bodies intruded into Archean to middle Proterozoic carbonate rocks and alumino-silicate rocks, porphyry-type, sham-type and hornfels-type Moores were formed with different types of wallrock alterations. Ore-forming fluids are characterized by H_2O-CO_2-NaCl with lower to middle saline (0 -12.7% NaCl). Oxygen and hydrogen isotope data suggest that ore-forming fluid of the early stage is mainly magmatic water. Along with evolution of mineralization to late stage, ratio of magmatic water decreased and meteoric water added.