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Tectonics and mechanisms of uplift in the central uplift belt of the Huimin depression

Content Provider	Springer Nature Link
Author	Ni, Jinlong Guo, Ying Wang, Zhimin Liu, Junlai Lin, Yuxiang Li, Yue
Copyright Year	2011
Abstract	The Huimin (惠民) depression is a third-level tectonic element of the Bohai (渤海) Bay basin in eastern China. The central uplift belt is the most important oil and gas accumulation zone in the depression, but the lack of adequate geological studies in the area has greatly hindered exploration and development. In this article, using seismic data, fracture mechanics, and a combination of data on fault growth indices and fault throws, we present an analysis of tectonic activity in the central uplift belt and adjacent regions. The amount of extension is calculated along balanced N-S cross-sections, along with the thickness of strata eroded from the fourth, third, and second members of the Shahejie (沙河街) Formation (Es $^{4}$-Es $^{2}$) in the uplift belt, by analyzing porosity and stratigraphic correlations. In addition, uplift features are described, and their timing and processes of formation are analyzed and discussed. The results indicate that strike-slip and extensional tectonic movements coexisted, with the effects of the latter most obvious. The spatial and temporal nature of the extensional movements is varied: fault activity during the period Ek-Es $^{4}$ was the strongest on the northern Ningnan (宁南) fault, and activity in the western part of the area was stronger than that in the east, which in turn was stronger than that in the central region; during Es $^{3}$-Es $^{2}$, the strongest fault movements were along the eastern part of the middle Linyi (临邑) fault, and activity in the western part of the area was relatively weak, whereas in the mid-west it was the strongest. The extensional movements were a response to the activity of the faults. The sediments in the lower part of the fourth member of the Shahejie Formation (Es $^{4}$ $_{x}$) show that Es $^{4}$ was the time when the central belt first began to be uplifted strongly. Uplift was uneven during the Paleogene: the western part of the area was uplifted continuously, while the mid-eastern area underwent alternating periods of uplift and subsidence. During the Paleogene, a number of different tectonic features developed in the central uplift belt at different times and are manifested as follows: during the period Ek-Es $^{4}$, a gentle slope was formed as part of the Zizhen (滋镇) sag; during Es $^{3}$-Es $^{2}$, the northern part of the central uplift belt continued to display a gentle slope as part of the Zizhen sag, but the southern region developed an steep slope as part of the Linnan (临南) sag. There are close interrelationships between uplift, strike-slip, and extension within the central uplift belt of the Huimin depression, as is manifest by the areas of strongest extension being uplifted most rapidly, and also eroded the most.
Starting Page	299
Ending Page	315
Page Count	17
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	22
Issue Number	3
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2011-05-25
Publisher Place	China University of Geosciences
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Huimin depression central uplift belt Paleogene tectonic features uplift mechanisms Bohai Bay basin Computer Applications in Earth Sciences Earth Sciences Biogeosciences Applied Earth Sciences Geology Geochemistry
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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