1. Key Laboratory of Earthprobe and Geodynamics, MLR, Institute of Geology, China Academy of Geological Sciences, Beijing 100037；
2. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083
The Yangtze and Cathaysian continents are the two basic tectonic units of the South China Continent （SCC）， but the location of their suture zone （especially the west extension location）is the focus of debate for a long time. With constraints of the newly seismic reflection profile detected by the SinoProbe—02 project and the geological data of the SCC， we performed fusion analysis of gravity and magnetic data in the SCC for understanding crustal structures of the Yangtze—Cathaysian blocks and then tracing their geosuture during Neoproterozoic era. Because multiple types of magma formed during multiple geological eras are widely distributed in the South China， presenting non—ignorable effects of remanence， our fusion analysis was performed on the Analytic Signal （AS） rather than on the original magnetic total field anomalies or the reducetopole anomalies. Our results revealed that the eastern boundary of the geosuture is the line of Yingtan—Pingxiang—Hengyang—Hezhou—Beihai， while the western one is the line of Yichang—Zhangjiajie—Tongren—Duyun—Baise. The geosuture to the east and north of Yingtan become unclear due to the large—scale magma in the crust over there.
Guo Lianghui,Gao Rui,Zhang Jisheng et al. The geosuture between the Yangtze and Cathaysia blocks, South China, during Neoproterozoic era revealed from gravity and magnetic data[J]. Chinese Journal of Geology, 2016, 51(3): 682-693.