Basement structures underneath the northern South Yellow Sea basin (East China): Implications for the collision between the North China and South China blocks

Autor: Yin-guo Zhang, Jun Liu, Baohua Lei, Jian Shi, Jianwen Chen, Jianqiang Wang, Ming Xu, Jie Liang, Hong Liu
Rok vydání: 2019
Předmět:
Zdroj: Journal of Asian Earth Sciences. 186:104040
ISSN: 1367-9120
DOI: 10.1016/j.jseaes.2019.104040
Popis: The South Yellow Sea basin (SYSB), as the eastern part of the Yangtze Block, has undergone multiple tectonic events since the formation of its basement. The North China-South China collision affected intensely the structures of the basin. The relationship between the deep structures in the basement and collisional orogeny has long been a matter of debate. In this paper, 2D seismic, magmatic, gravity and drilling data were integrated to unravel the basement structures. In the interpreted seismic sections, the basement can be subdivided into three seismic facies. The Seismic Facies I and III correspond to two basement layers; the Seismic Facies II is interpreted as shear zones that were formed during the Mesozoic collision and exhumation. The influence of the North China-South China collision propagated from north to south in the SYSB. According to observations from drill holes and seismic sections, the northern part of the basin, the Yantai Depression, uplifted during the earlier stage of the collision, resulting in the erosion of the upper Paleozoic and Triassic strata. In the middle and southern parts, the Laoshan Uplift and Qingdao Depression, the compression was obviously after that in the Yantai Depression. The exhumation of the Qianliyan basement metamorphic complex of the Yangtze Block occurred gradually. The shear zones were initially developed during the collision during Early Mesozoic. The exhumation process of metamorphic rocks lasted till Late Mesozoic and the Jurassic-Cretaceous strata were deposited in the hanging wall of the northern boundary fault.
Databáze: OpenAIRE
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