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Metallogenic Mechanism of the North Qinhang Belt, South China, from Gravity and Magnetic Inversions
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 25th European Meeting of Environmental and Engineering Geophysics, Sep 2019, Volume 2019, p.1 - 5
Abstract
Qin—Hang metallogenic belt are famous tectonic units and important rich mineral resources in south China. Due to few geophysical data, there was previously lack of comprehensive geophysical research in this area. In this paper, based on priori geological information and exploration data, regional structures are divided and volcanic rocks are delineated, even the deep dynamic process and mineralization mechanism have been speculated from gravity and magnetic data inversion. The boundary between Cathaysia plate and the Yangtze plate, and five geological blocks, even major fractures can be identified, which is the main channel of magma upwelling. Some deep and large faults control magmatic activity, and those secondary faults control regional mineralization. Negative gravity anomaly can be used as a basis for searching magmatic rocks. Here abundant basic - ultrabasic magma in 220~250 Ma period, is the result of lithosphere stretching, thinning and mantle upwelling. It is a vital metallogenic mechanism in the belt that ancient subduction zone after modification or superimposed mineralization in yanshan epoch. Further, the “proterozoic + Mesozoic” bimodal age phenomenon of porphyry and its associated ore deposits in this region can be confirmed.