LIN JiYan, TANG GuoBin, XU Tao, CAI HuiTeng, LÜ QingTian, BAI ZhiMing, DENG YangFan, HUANG MinFu, JIN Xing
.2020.P-wave velocity structure in upper crust and crystalline basement of the Qinhang and Wuyishan Metallogenic belts: constraint from the Wanzai-Hui'an deep seismic sounding profile Chinese Journal of Geophysics(in Chinese),63(12): 4396-4409,doi: 10.6038/cjg2020O0158
P-wave velocity structure in upper crust and crystalline basement of the Qinhang and Wuyishan Metallogenic belts: constraint from the Wanzai-Hui'an deep seismic sounding profile
LIN JiYan1,2,6, TANG GuoBin1, XU Tao1,7, CAI HuiTeng3, LÜ QingTian4, BAI ZhiMing1, DENG YangFan5, HUANG MinFu1,6, JIN Xing3
1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China; 3. Earthquake Administration of Fujian Province, Fuzhou 350003, China; 4. Chinese Academy of Geological Sciences, Beijing 100037, China; 5. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 6. University of Chinese Academy of Science, Beijing 100049, China; 7. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
Abstract：The Qinhang Metallogenic Belt (QMB) and Wuyishan Metallogenic Belt (WMB) are two major ones in South China, in which mineralization occurred mainly in an intracontinental orogeny during the Mesozoic. Geologic research shows that the characteristics of crystalline basement and faults have significant controls on the metallogenic processes, so probing the upper crustal structure has reference value to the study on the distinction of the metallogenesis. This work builds on the first arrival data from the NW-SE Deep Seismic Sounding (DSS) profile, which transects the QMB and the WMB, extending from Waizai, Jiangxi Province to Hui'an, Fujian Province. The upper crustal P wave velocity structure at depths 0~8 km is imaged by using the finite difference travel time tomography method. The results show that (1) the P wave velocity of the QMB and WMB is heterogeneous in lateral direction and the crystalline basement is relatively shallow, about 1.0~3.0 km, using the 5.8 km·s-1 contour line as reference. The crystalline basement's depth of the QMB is relatively smaller than the WMB, with 0.5~2.0 km and 1.5~3.0 km, respectively. (2) The high velocity zones (positive velocity anomaly) have a good accordance with the magmatic rocks on the surface, while the low velocity zones (negative velocity anomaly) have a good accordance with the major faults or the sedimentary basins. The low velocity beneath the Shaoxing-Jiangshan-Pingxiang Fault (SJPF) and Zhenghe-Dapu Fault (ZDF) indicates that both extend downward more than 8 km, which separate the Yangtze block and Cathaysia block. (3) Based on the existing geological and geophysical data, we speculate that the discrepancy of the upper crustal P wave velocity, the depth of crystalline basement and the faults' properties beneath the QMB and WMB are the key factors to result in the discrepancy of the two metallogenic belts.
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