Mineralogy of the Xiba Granitoid Pluton in the Southern Qinling Orogenic Belt and Its Implications for Petrogenesis

Abstract

Abstract:

The Xiba granitoid pluton, as an important part of the IndoChinese Wulong granitoid series, is located in the middle section of the Southern Qinling orogenic belt and spatially related to the Shuangwang gold deposit. It mainly consists of quartz monzodiorite and granodiorite containing many mafic microgranular enclaves (MME). Systematic petrological and mineralogical studies indicate that the rocks belong to I type granite. The petrographical studies of granite and MME suggest that magma mixing plays a great role during magma crystallization. The pressure of the granite estimated by Alinhornblend barometer is from 167×108 to 366×108 Pa. Amphiboleplagioclase thermometry yields a forming temperature of 64972~70384 ℃. The plutons equilibrated under high oxygen fugacities (lg fO2) ranging from -1616×105 to -1706×105 Pa, moderate water fugacities (fH2O) between 4682×105 and 13685×105 Pa, and also moderate hydrogen fugacities (fH2) from 032×105 to 091×105 Pa. The high oxygen fugacities provide suitable conditions for Au entering into melt and fluid, thus favor the formation of gold deposit.

Key words: Xiba granitoid pluton, mafic microgranular enclave, mineralogy, magma mixing, physical and chemical conditions, Southern Qinling

HONG Huan-1, 2 , WANG Jian-Beng-1, 2 , LIU Jia-Jun-1, 2 , CAO Rui-Rong-3, HUI De-Feng-3, CHENG Jian-Jun-3. Mineralogy of the Xiba Granitoid Pluton in the Southern Qinling Orogenic Belt and Its Implications for Petrogenesis[J]. Geoscience, 2011, 25(3): 489-502.

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