Citation: | LI Hong-zhong, YANG Zhi-jun, ZHOU Yong-zhang, GU Zhi-hong, MA Zhan-wu, Ü Wen-chao, HE Jun-guo, AN Yan-fei, LI Wen, WANG Qiang, 2009. Microfabric Characteristics of Cherts of Bafangshan-Erlihe Pb-Zn Ore Field in the Western Qinling Orogen. Earth Science, 34(2): 299-306. |
With high stability, chert is widely distributed in the orogens, whose major composition is SiO2.Affected by the orogeny, metallogenesis and recrystallization, the metamorphic processes can be well revealed by the megatectonics and microfabric characteristics.The study of the megatectonics and microfabric characteristics of the cherts of Bafangshan-Erlihe Pb-Zn ore field in the western Qinling orogen reveals that there are obvious hydrothermal sedimentary characteristics in the cherts.Because of the stresses, two types of which are extensional and compresso-shear, there are megatectonics of compresso-shear faults with EW direction and gapping faults with NNE and NNW directions.What's more, there are microfabric characteristics of microcracks and microcorrugations and stretched-out grains of quartzs.In the rocks of this ore deposit field, the dynamic metamorphism, metamorphic recrystallization and other kinds of metamorphisms are clearly revealed.The trace carbonate minerals and the stress are both important to the metallogenesis of this ore deposit, which provide the pathway and space for the metallic sulphide fluids to travel and deposit.
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