Petrofabric Features and Meso-Cenozoic Differential Deformation Mechanism in Northern Side of East Qinling-Dabie Orogenic Belt

China Petroleum Exploration ›› 2011, Vol. 16 ›› Issue (4): 42-47,4.

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Petrofabric Features and Meso-Cenozoic Differential Deformation Mechanism in Northern Side of East Qinling-Dabie Orogenic Belt

Cheng Zhe,Guo Qijun,Hu Wangshui,Tang Jiguang and Huang Zeguang

Cheng Zhe1,Guo Qijun2,Hu Wangshui3,Tang Jiguang3,Huang Zeguang4 1.Petroleum Exploration & Production Research Institute,SINOPEC,Beijing 100083;2.Exploration and Production Department,SINOPEC,Beijing 100728;3.College of Geosciences,Yangtze University,Jingzhou City,Hubei Province 434023;4.Wuxi Research Institute of Petroleum Geology,Petroleum Exploration & Production Research Institute,SINOPEC,Wuxi City,Jiangsu Province 214151

Online:2011-08-15 Published:2011-08-15

Abstract

Abstract: Differential deformation occurs in Meso-Cenozoic in northern side of East Qinling-Dabie orogenic belt due to imbalanced intercontinental orogeny and multiple tectonic superimposition and composition. The establishment of four typical petrofabric profiles demonstrates that fabrics are symmetrical orthorhombically or triclinically, and the southern part of each profile develops small circle girdle. The petrofabric features show that all samples undergo approximately horizontal NE-SW and NW-SE compression of two periods. The NE-SW compression in the west of Shangcheng- Huangchuan is the primary, but the intensity of compressions of two directions is similar in the east, and the southern Xixia-Yichuan profile undergoes intense uplift vertically. Intense overthrust tectonics in Indosinian and Middle Yanshanian taking Shangcheng-Huangchuan as an intermediate accommodation occurs temporal-spatial migration from east to west. Moreover, lateral fault accommodation during imbalanced deformation, and Neogene Tanlu fracturing are all fundamental causes of Meso-Cenozoic differential deformation in northern side of East Qinling-Dabie orogenic belt.

Key words: petrofabric, overthrust tectonic, differential deformation, Meso-Cenozoic, East Qinling-Dabie orogenic belt

CLC Number:

P618.13

Cheng Zhe, Guo Qijun, Hu Wangshui, Tang Jiguang and Huang Zeguang. Petrofabric Features and Meso-Cenozoic Differential Deformation Mechanism in Northern Side of East Qinling-Dabie Orogenic Belt[J]. China Petroleum Exploration, 2011, 16(4): 42-47,4.

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Petrofabric Features and Meso-Cenozoic Differential Deformation Mechanism in Northern Side of East Qinling-Dabie Orogenic Belt

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