Analogue modelling and mechanism of tectonic inversion of the Xihu Sag, East China Sea Shelf Basin

作者：Wang, Qian; Li, Sanzhong^*; Guo, Lingli; Suo, Yanhui; Dai, Liming

来源：Journal of Asian Earth Sciences, 2017, 139: 129-141.

DOI：10.1016/j.jseaes.2017.01.026

• The East China Sea Shelf Basin
• The Xihu Sag
• Tectonic inversion
• Analogue modelling
• Rheological similarity

The East China Sea Shelf Basin lies between the Pacific Subduction and Indian-Eurasian Collision tectonic domains and records Cenozoic tectonic inversion, especially in the Xihu Sag. To improve the understanding of the evolution and mechanism of tectonic inversion, this paper employs analogue modelling to reproduce the evolutionary process. Combined with the structural analysis of seismic profile, this paper determines the pattern of basement-involved faults. Simulation results show that under the transtension, two subsidence centers developed and a number of normal faults assembled in two flower structures. When the stress field turned into transpression, the geometry and deformation of inversion basin inherited the previous transtensional basin and pre-existing faults, respectively. The geometry and fault patterns in models are well consistent with those observed in the Xihu Sag, which indicates the plausibility of similar deformation controls. The formation of the tectonic inversion is related to the variation in stress field caused by the changes in the rates and directions of the subduction of the Pacific Plate and the collision of the Indian Plate with Eurasian Plate.

• 出版日期2017-5-15
• 单位中国海洋大学