Mineral Geochemistry of Biotites from the Mineralized Intrusive Bodies in the Late Mesozoic Porphyry Cu-Mo Deposits, Northern Great Xing'an Range and Its Geological Implications
MENG Fan-bo1, DENG Chang-zhou2*, FENG Yu-zhou3, TIAN Zhen-dong1, LI Cheng-lu4, GONG Lin3, CHEN Xu-sheng1, LYU Feng-tong1
1. Qiqihar Institute of Geological Exploration of Heilongjiang Province, Qiqihar Heilongjiang 161006, China;
2. Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550081, China;
3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640, China;
4. Heilongjiang Institute of Natural Resource Survey,Harbin 150036, China
Abstract：Compositions of biotites from mineralized intrusive bodies of the late Mesozoic Huoluotai and Baoquan Cu-Mo deposits in the northern Great Xing'an range were measured here by using the electron probe micro-analyzer with the aim to understand the metallogenic information of these deposits. The results show that the biotites from the Huoluotai and Baoquan deposits belong to the magnesium biotites. The biotite-bearing mineralized porphyry bodies are products of mixtures of crust and mantle melts formed in the active continental margin setting. The calculation results by using the biotite thermobarometer show that crystallization temperatures of biotites of the Huoluotai and Baoquan deposits range from 738 to 761 ℃ and 725 to 749 ℃, respectively. Their solidification pressures are 67-95 MPa and 102-141 MPa, respectively, corresponding to the depths of 2.55-3.60 km and 3.85-5.33 km, respectively. Oxygen fugacities of the studied biotites are near the HM buffer, indicating the relatively high oxygen fugacity environments for those magmas. Moderate lg(fHF/fHCl), lg(fH2O/fHCl) and lg(fH2O/fHF) values of the biotites indicate that those magmas have favorable conditions for the simultaneous Cu and Mo mineralization. Biotite geochemical characteristics indicate that the northern Great Xing'an range has beneficial tectonic and magmatic conditions for the formation of late Mesozoic porphyry Cu-Mo deposits.
孟凡波, 邓昌州, 冯雨周, 田振东, 李成禄, 龚林, 陈旭升, 吕凤彤. 大兴安岭北段晚中生代斑岩铜钼矿床成矿岩体黑云母地球化学特征及地质意义[J]. 矿物岩石地球化学通报, 2021, 40(4): 914-924.
MENG Fan-bo, DENG Chang-zhou, FENG Yu-zhou, TIAN Zhen-dong, LI Cheng-lu, GONG Lin, CHEN Xu-sheng, LYU Feng-tong. Mineral Geochemistry of Biotites from the Mineralized Intrusive Bodies in the Late Mesozoic Porphyry Cu-Mo Deposits, Northern Great Xing'an Range and Its Geological Implications. Acta Metallurgica Sinica, 2021, 40(4): 914-924.
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