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Scratch recognition and analysis of gravity field in Chinese continent

Sun Yanyun, Yang Wencai, Zeng Xiangzhi, Zhao Tingyan, Zhang Wan, Zhang Xuanjie, Zhang Jiahong

Acta Geophysica

2022

Vol. 70, no 5

2001--2012

Applying the scratch recognition method to regional gravity fields, we defend the ridge and edge coefficient for delineation of the deformation belts and the tectonic boundaries, which are able to recognize characteristic parameters about crustal scratches contained in regional gravity field. The tests on theoretical models prove that our method is correct and applicable. After performing this procedure to Bouguer gravity field of Chinese continent, we obtain the resulting scratch maps for locating the crustal deformation belts. Finally, by comparing the known deformation belts in Chinese continent with these crustal scratches, we try to find the correlation between these scratches and the Phanerozoic crustal deformation belts. Comparison between the calculated crustal scratches and different types of deformation belts in Chinese continent shows that the strong and long scratches are correlated with most of mature plate collisional zones, strike-slip fault zones and large crustal detachments in Phanerozoic, which have been found by Chinese geologists. Thus, the scratch procedure is meaningful for recognizing the crustal deformation belts and useful for locating tectonic boundaries. However, young and active deformation faults are usually correlated with rather weak scratches as they are not mature enough.