Tectonic property and deformation history of Sangzhi-Shimen synclinorium corridor profile in western margin region of Hunan-Hubei Province

Abstract

The Sangzhi-Shimen synclinorium, which is in the western margin region of the Hunan-Hubei Province and as the southeast part of the middle Yangtze platform, is a second-level tectonics unit in the south of this region. Along the profile, it can be divided into 5 third-level structure belts. By the comprehensive interpretation of seismic data and magnetotelluric (MT) sounding data, it is found that the surface structure is not in accordance with that of the underground, and this un-coordination can be conducted by many decollement surfaces between the layers. There are three periods of deformation in its geo-history in this region: before the early Yanshan stage, during the early Yanshan stage and after the early Yanshan stage, while the main deformation period is during the early Yanshan stage. And the mechanism of deformation is the thrust faults in basement, which are controlled by many decollements, in addition to the decollement of the cap-rock.

Keywords

Sangzhi-Shimen synclinorium / tectonic property / structure decollement surface / deformation mechanism

References

[1] DuanTai-zhong, ZengYong-fu, GaoZhen-zhong. Analysis of the tectonic evolution of the margin of the paleo-south China continent based on the sedimentary history [J]. Oil and Gas Geology, 1988, 9(4): 410-420(in Chinese)

[2] MaWen-pu, LiXue-jun, LiuHe-pu, et al.. The tectonic property of the Xuefeng uplift and its alteration on the paleozoic basins on the south-east margin of the upper Yangtze platform. Layer decollement and multi-time compound structure in the Xuefeng area, south of the Long River [M], 1993, Beijing, Geological Publishing House(in Chinese)

[3] WangXie-pei, FeiQi, ZhangJia-huaThe tectonic analysis on petroleum exploration [M], 1990, Wuhan, China University of Geosciences Press(in Chinese)

[4] SuppeJ. Geometry and kinematics of fault-bend folding [J]. American Journal of Science, 1983, 283(4): 684-721

[5] MitraS. Fault-propagation folds: geometry, kinematics evolution and hydrocarbon [J]. Association of American Petroleum Geologist Bulletin, 1990, 74(6): 921-945

[6] RenJi-shun. Some new ideas on tectonic evolution of eastern China and adjacent areas [J]. Regional Geology of China, 1989, 31(4): 289-300(in Chinese)

[7] SHUI Tao. The structure framework of the continent basement in south-eastern China [J]. Science in China (B), 1987(4): 414–422. (in Chinese)

[8] WangHong-zhen, YangSen-nan, LiSi-tian. Mesozoic and cenozoic basin formation in east China and adjacent regions and the development of the continental margin [J]. Acta Geologica Sinica, 1983, 57(3): 213-223(in Chinese)

[9] XU Jing-hua, SUN Shu, LI Ji-liang. Huanan orogenic belt, not the south China platform [J]. Science in China (B), 1987(11): 1107–1115. (in Chinese)

[10] XuXiao-song, XuQiang, PanGui-tang, et al.The Evolution of the South China Continent and its Global Paleo-Geographical Comparison [M], 1996, Beijing, Geological Publishing House(in Chinese)

[11] Hsu K J, Sun S, Li J L, et al. Mesozoic over-thrust tectonics in south China [J]. Geology, 1988(16):418–421.

[12] Hsu K J, Li J L, Cheng H H, et al. Tectonics of south China: key to understanding west Pacific geology [J]. Tectonophysics, 1990, (183): 9–39.

[13] MitraS. Duplex structures and imbricate thrust systems: geometry, structure position, and hydrocarbon potential [J]. Association of American Petroleum Geologist Bulletin, 1986, 70(6): 1087-1112