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The structure of the northern Qin‐Hang belt from 3D gravity inversion
Author(s) -
Liu Yan,
Lü Qingtian,
Farquharson Colin G.,
Yan Jiayong
Publication year - 2019
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.14065
Subject(s) - hang , geodesy , geology , inversion (geology) , seismology , engineering , structural engineering , tectonics
There is a metallogenic belt from Qinzhou Bay to Hangzhou Bay, often referred to as the Qin—Hang metallogenic belt, which is a famous tectonic unit in South China and is also important because it is rich in mineral resources. According to a tectonic pattern, the Qin—Hang metallogenic belt roughly corresponds to the Yangtze plate in the northwest and the Cathaysian plate in the southeast, and the two major tectonic plates play a great role in continental crust reconstitution and searching for mineral resources. Therefore, many scholars have been attracted to this area (Yang et al., 2009; Zhang et al., 2009; Zhou et al., 2012). Based on the integrity and internal heterogeneous structure, this metallogenic belt has been divided into three segments namely north, middle and south by Yongzhang Zhou (2012). In fact, due to strong magmatic activity, a complex tectonic and dynamic evolution, and stacked sheets in this region, vegetation coverage is also very extensive. Consequently, the overall geological background of the Qin-Hang metallogenic belt is not clearly understood. As a density anomaly model by 3D inversion can serve to extend our knowledge about the Moho topography and crustal density structure across the margin and provide a better framework for understanding the geodynamics of rifting (Williams et al., 2004; Oldenburg et al., 2007; Welford et al., 2007; Lü, et al., 2015), we have undertaken 3D gravity inversion of the bouguer anomaly data to generate a 3D density anomaly model of the region. This study chooses the northern section of the Qin-Hang belt at 27.6°N-31°N, 116.4°E-121°E as our research area.