Mesozoic-Cenozoic tectonic evolution and buried hill formation in central Bohai Bay

doi:10.13745/j.esf.sf.2022.3.36

Abstract

Abstract:

The Bohai Bay Basin is a Late Mesozoic-Cenozoic faulted basin in the eastern North China Craton. Located in the continental active margin of the western Pacific Ocean, the Bohai Bay Basin experienced multi-stage tectonic movements of various types. Currently there is still much controversy over the divisions of tectonic stages and stress fields for each tectonic movement in the Bohai Bay Basin during the Meso-Cenozoic. Buried hill is a palaeogeomorphologic feature formed before the basin filled and then buried by new sedimentary cover. The pre-existing faults inside the buried hill and the contact relationship between the buried hill and the overlying new strata provide an evidence basis for studying the tectonic movement in the basin. Choosing the Bozhong 19-6 buried hill as an example, this paper proposes a new structural model for the buried hill, based on the 3D seismic interpretation and systematic structural analysis of coherent seismic profile and drilling data, and discusses the regional tectonic evolution of the eastern North China Craton. The current structural characteristics of the Bozhong 19-6 buried hill are: (1) The buried hill is bounded by a series of S-N-trending normal faults, which separates it to the east and the Shanan Depression to the west. The buried hill first appeared in the Late Triassic and formed in the Early Cretaceous. (2) The S-N-trending boundary faults and the E-W-trending faults within the buried hill are formed by the transpressive strain due to the regional strike-slip faults along either sides of the buried hill, which are the important controlling factors for the structural reservoir in the buried hill. (3) The buried hill, impacted by the scission-type collision between the North China and Yangtze Plates and the NNW-ward subduction of the Paleo-Pacific Plate, underwent six-stage tectonic evolution since the Mesozoic era: the Early Indosinian compression, the Late Indosinian extension, the Early Yanshanian sinistral transpression, the Middle Yanshanian sinistral transtension, the Late Yanshanian sinistral transpression, and the final Himalayan transtension.

Key words: Bohai Bay Basin, central Bohai Sea, buried-hill, tectonic evolution, Meso-Cenozoic, Sha'nan Sag

CLC Number:

ZHOU Qijie, LIU Yongjiang, WANG Deying, GUAN Qingbin, WANG Guangzeng, WANG Yu, LI Zunting, LI Sanzhong. Mesozoic-Cenozoic tectonic evolution and buried hill formation in central Bohai Bay[J]. Earth Science Frontiers, 2022, 29(5): 147-160.

Figures/Tables 14

Fig.1 Simplified maps showing the tectonic location of the Bohai Bay Basin and the location of the Bozhong 19-6 buried hill structure

Fig.2 Maps of fault distribution of the Bozhong 19-6 buried hill structure (a) and stratigraphic chart of the Bozhong 19-6 buried hill structure(b). b modified after [43].

Fig.3 Fault pattern of the Bozhong 19-6 buried hill structure and its surrounding areas

Fig.4 The interpreted E-W (a) and S-N (b) seismic profiles across the Bozhong 19-6 buried hill structure

Fig.5 The interpreted NW-SE seismic profile across the Bozhong 19-6 buried hill structure

Fig.6 Interpreted NE-SW seismic profile across the Bozhong 19-6 buried hill structure (a) and distribution of the strata of the Bozhong 19-6 buried hill structure(b)

Fig.7 Tectonic evolutionary model along NE-SW profiles

Fig.8 Structural section of the Chengbei Sag (a) and distribution of NW-trending faults and uplifts around the Bozhong Sag (b). Modified after[49].

Fig.9 Mesozoic evolutionary model of the Bozhong 19-6 buried hill structure

Fig.10 Tectonic evolution model of the Bozhong 19-6 buried hill structure

Fig.11 Stress analysis between two sinistral strike-slip fault zones (a)and stress analysis between two dextral strike-slip fault zones(b)

Fig.12 Cenozoic tectonic model of the Bozhong 19-6 buried hill structure

Fig.13 Analysis graphics of each periods' tectonic backgrounds

Fig.14 Distribution of uplifts and depressions in the basin (a) and lithospheric delamination and deep mantle upwelling (b). b modified after[13].

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