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balanced cross section for Restoration of Tectonic Evolution in the Southwest Okinawa Trough

Journal of China University of Geosciences 2007年第1期18卷 1-10页

作者：吴时国倪祥龙郭军华 Key Lab of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences College of Georesources and Information Petroleum University of China (Huadong) Qingdao 266555 China Ni Xianglong Graduate School Chinese Academy of Sciences Beijing 100049 China

On the basis of the *** seismic data and the other data, using 2DMove software, the tectonic evolution in three seismic profiles was restored since Pliocene. The tectonic restoration results show that：（1） the initial active center lay in the west slope and then was transferred to east and south via trough center during the evolution process; （2） several main normal faults controlled the evolution of the southern Okinawa Trough; （3） since Late Pliocene, the southern Okinawa Trough has experienced two spreading stages. The early is depression in Early-Middle Pleistocene and the late is back-arc spreading in Late Pleistocene and Holocene, which is in primary oceanic crust spreading stage.

关键词： balanced cross section tectonic evolution back-arc basin Okinawa Trough

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Tectonic Evolution of the Middle Frontal Area of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China

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Acta Geologica Sinica(English Edition) 2009年第1期83卷 92-102页

作者： JIN Wenzheng TANG Liangjie YANG Keming WAN Guimei Lü Zhizhou YU Yixin Basin and Reservoir Research Center China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resource and Prospecting Beijing 102249 China Southwest Branch Company SINOPEC Chengdu 610081 China

By analyzing the balanced cross sections and subsidence history of the Longmen Mountain thrust belt, China, we concluded that it had experienced five tectonic stages：（1） the formation stage （T3x） of the miniature of Longmen Mountain, early Indosinian movement, and Anxian tectonic movement created the Longmen Mountain; （2） the stable tectonic stage （J1） where weaker tectonic movement resulted in the Longmen Mountain thrust belt being slightly uplifted and slightly subsiding the foreland basin; （3） the intense tectonic stage （J2-3）, namely the early Yanshan movement; （4） continuous tectonic movement （K-E）, namely the late Yanshan movement and early Himalayan movement; and （5） the formation of Longmen Mountain （N-Q）, namely the late Himalayan movement. During those tectonic deformation stages, the Anxian movement and Himalayan movement played important roles in the Longmen Mountain＇s formation. The Himalayan movement affected Longmen Mountain the most; the strata thrust intensively and were eroded severely. There are some klippes in the middle part of the Longmen Mountain thrust belt because a few nappes were pushed southeastward in later tectonic deformation.

关键词： balanced cross section shortening rate subsidence history Longmen Mountain thrust belt,Sichuan basin

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