The inferential basis and significance of the deep fault to the west of the Baiquesi complex in Lueyan
YOU Jun1(), ZHANG Xiao-Ming1, LOU Qian-Zhou1, SHI Zhao-Yang1, YANG Yun-Jun1, CHEN Jian-Xiang2, YUAN Pan2
1. Shaanxi Center of Mineral Geological Survey, Xi’an 710068, China 2. Hanzhong Geological Party Co., Ltd., Shaanxi Bureau of Geology and Mineral Exploration, Hanzhong 723000, China
Mianluening area is one of the most complex areas of geological structure around the Yangtze plate. Based on the comparative study of the high magnetic anomaly zone to the west of Baiquesi basic complex, the regional gravity anomaly gradient zone and the geochemical anomalies of Fe, V, Ti and other elements, combined with the geochemical characteristics of the overflow phase basalts distributed along the anomaly zone, it is inferred that there may be a larger hidden fault in the deep part of the NNE-trending shallow faults interpreted by surface remote sensing. This hidden deep fault may have provide an important channel for the mantle-derived magmatic activity in the context of post arc cracking in Mianluening area in the Neoproterozoic. On the one hand, the Baiquesi basic complex and igneous carbonatite were formed by the intrusion of the plutonic magma; on the other hand, the belt like overflow phase basalt rich in magnetite was formed by the fissure type volcanic eruption. This finding is of great significance for the study of Neoproterozoic tectonic setting and mantle-derived magmatic mineralization in Mianluening area.
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YOU Jun, ZHANG Xiao-Ming, LOU Qian-Zhou, SHI Zhao-Yang, YANG Yun-Jun, CHEN Jian-Xiang, YUAN Pan. The inferential basis and significance of the deep fault to the west of the Baiquesi complex in Lueyan. Geophysical and Geochemical Exploration, 2021, 45(3): 645-652.
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