Architectural characteristics of the normal-dextral fault in mudstone strata: Anatomy based on the cores from the Bohai Bay basin

Lao, Haigang; Wang, Yongshi; Shan, Yixian; Wu, Zhaohui; Qin, Li

doi:10.1016/j.marpetgeo.2020.104502

Cited by 2 publications

(2 citation statements)

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“…The second phase of rifting took place in the middle Eocene through the Oligocene. It was characterized by the occurrence of dextral transtensional deformation along preexisting NNE-trending structures and the opening of the Northeast Huanghua and Bozhong depressions, which were bound by E-W-trending faults [12,22,26]. Strata from the third to the first members of Shahejie Formation (Es3, Es2, and Es1) to the Dongyin Formation (Ed) accumulated during this phase (Figure 2).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Bohai Bay Basin in East China is one of the largest among them and preserves a nearly complete package of Cenozoic successions. Therefore, it provides an ideal place for studying processes and mechanisms of back-arc crustal stretching associated with Pacific subduction [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Structures and Kinematics of the Huanghua Depression in Bohai Bay Basin, East China: Implications for the Formation Mechanism of a Transtensional Basin

Mao

Zhao²,

Zhang

et al. 2021

Lithosphere

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The Bohai Bay Basin in East Asia is a rift basin created by Cenozoic subduction of the oceanic Pacific plate beneath the Asia continent. Many prior studies suggest that the basin was initially formed in the Paleocene with the development of several NNE-trending extensional grabens, but subsequently impacted by right-lateral shear along these existing NNE-trending structures in the middle Eocene, transforming the Bohai Bay Basin into a transtensional basin and producing EW-trending grabens in the Bozhong and the northeastern Huanghua depressions. However, how this transformation occurred remains to be fully understood. Based on seismic and drilling data, we herein investigated the fault structures, basin architecture, and evolutionary stages of the Huanghua Depression in the central-west Bohai Bay Basin to examine the strain partitioning and evolution mechanism during the Paleogene syn-rifting stage. The results reveal that the Huanghua Depression is composed of three structurally distinctive zones, namely, a dextral transtensional, a NW-SE extensional, and a N-S extensional zones from southwest to northeast, which are separated from each other by two transfer zones. The NW-SE extensional zone is interpreted as a horsetail structure on the northern termination of the dextral transtensional zone. This dextral transtensional zone and the Tan-Lu Fault zone to the east served as strike-slip boundaries within which EW-trending depressions such as the northeastern Huanghua and Bozhong depressions formed in the middle Eocene.

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Section: Geological Settingmentioning

confidence: 99%