莺歌海盆地异常裂后沉降的动力学机制

崔涛; 解习农; 任建业; 张成

Volume 33 Issue 3

May 2008

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CUI Tao, JIE Xi-nong, REN Jian-ye, ZHANG Cheng, 2008. Dynamic Mechanism of Anomalous Post-Rift Subsidence in the Yinggehai Basin. Earth Science, 33(3): 349-356.

Citation:

CUI Tao, JIE Xi-nong, REN Jian-ye, ZHANG Cheng, 2008. Dynamic Mechanism of Anomalous Post-Rift Subsidence in the Yinggehai Basin. Earth Science, 33(3): 349-356.

CUI Tao, JIE Xi-nong, REN Jian-ye, ZHANG Cheng, 2008. Dynamic Mechanism of Anomalous Post-Rift Subsidence in the Yinggehai Basin. Earth Science, 33(3): 349-356.

Citation:

CUI Tao, JIE Xi-nong, REN Jian-ye, ZHANG Cheng, 2008. Dynamic Mechanism of Anomalous Post-Rift Subsidence in the Yinggehai Basin. Earth Science, 33(3): 349-356.

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Dynamic Mechanism of Anomalous Post-Rift Subsidence in the Yinggehai Basin

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Department of Earth Sciences, University of Windsor, Windsor, Ontario, N9B 3P4 Canada
3.
Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074

Received Date: 2008-01-24
Publish Date: 2008-05-25

Abstract

Abstract

In order to understand the dynamic mechanism of formation and evolution of the Yinggehai basin, the backstripping and strain rate inversion methods are used to study the stratigraphic sections and boreholes by analyzing the relevant data.The results show a discrepancy between observed post-rift subsidence and theoretically predicted post-rift subsidence based on a multiple rift model.Our modeling results of two seismic sections show clearly that the anomalous subsidence during the post-rift stage in the northwestern part of the basin, between 300 m and 500 m, is much less than that in the middle and southeastern parts, which ranges from 900 to 1 200 m.We compare these results with those of time-dependent dynamic topography subsidence based on the global mantle flow model.The computed dynamic topography decreases by about 300 m from 20 Ma ago to the present in the northern South China Sea area.Observed anomalous subsidence within a range of less than 300 m during the post-rift stage can be interpreted as the effect of dynamic topography.However, the huge anomalous subsidence in the middle and southeastern areas may originate from a combination of the dextral strike-slip movements of marginal faults since the Late Miocene, rapid thermal subsidence after rifting and the response of dynamic topography.
- Yinggehai basin,
- tectonic subsidence,
- dynamic topography,
- anomalous subsidence,
- strain rate inversion

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References(42)

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