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Interpreting the Coseismic Uplift and Subsidence of the Longmen Shan foreland basin system during the Wenchuan Earthquake by a Elastic Flexural Model

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 555-566页

作者： YAN Zhaokun LI Yong SHAO Chongjian ZHOU Rongjun YAN Liang ZHAO Guohua YAN Binglei State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (CDUT) Chengdu 610059 China Sichuan Earthquake Administration Chengdu 610041 China

The coseismic surface uplift of the Longmen Shan（LMS） created an instantaneous topographic load over the western margin of the Sichuan basin, where surface subsidence, decreasing eastward, has been measured using several methods, such as GPS, SAR and levelling. Using an elastic flexural model, we aim to interpret the coseismic surface uplift and subsidence, and constrain the effective lithospheric elastic thickness（Te） of the Sichuan basin. Using different effective elastic thickness values for the Sichuan basin, a series of subsidence curves were computed by the elastic flexure model equation for a broken elastic plate. The curves, produced by models using an effective elastic thickness of 30–40 km, provided the best fit to the general pattern of observed coseismic subsidence of the Sichuan basin. However, the calculated subsidence（-40–70 cm） at the front of the LMS is evidently lower than the observed values（-100 cm）, suggesting that the effective elastic thickness therein should be lower. These results indicate that the lithospheric strength may decrease westward from the Sichuan basin to the LMS.

关键词： flexural model Longmen Shan Wenchuan Earthquake coseismic uplift and subsidence foreland basin system

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Tectonic Evolution of the Junggar foreland basin in the Late Carboniferous-Permian

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Acta Geologica Sinica(English Edition) 2001年第4期75卷 398-408页

作者： CHEN Shuping, ZHANG Yiwei, TANG Liangjie and BAI Guoping basin and Reservoir Research Centre, University of Petroleum, Changping, Beijing 102249 Univ Petr Basin & Reservoir Res Ctr Beijing 102249 Peoples R China

A comprehensive study has been carried out to subdivide and correlate the Upper Carboniferous and Permian sedimentary successions in the Junggar basin based on outcrops and drilling and geophysical data. The study results, combined with geological analyses of the basin's periphery and the basement, as well as studies of the sedimentary rocks within the basin, the unconformities, tectonic geometry, kinematics and geodynamics, lead to the conclusion that the Junggar basin was characterized by the development of foreland basin systems during the Late Carboniferous and Permian. During that period, three foreland basin systems were developed: (1) the northwest foreland basin system, which trended nearly north-south from Mahu to the Chepaizi Palaeo-mountain during its early stage of development and thus it was also referred to as the west foreland basin system; (2) the Karamaili foreland basin system in the east and (3) the Northern Tianshan foreland basin system in the south. These systems are different in size, development stage and time of formation. The first two are developed earlier than the third, but they are smaller in size. All the structures in the Junggar basin have resulted from the integration and superposition of structural elements in the above three systems. In general, the development of the Junggar basin can be divided into four stages. Stage I was marked by the creation and evolution of the marginal western foreland and the peripheral Karamaili foreland basin systems during the Late Carboniferous-early Early Permian (C3P1ja). Stage II was characterized by the development of complicated foreland basin systems during the middle-late Early Permian (P1jb-P1f) when the three foreland basin systems took their shapes. Stage III was the integration stage of peripheral foreland basin systems during the Middle Permian (P2) in which steady and slow tectonic subsidence prevailed. Stage IV coincided with the shrinking of foreland basin development during the Late Permian (P3).

关键词： Junggar basin foreland basin system tectonic evolution

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