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地质科学  1997, Vol. Issue (3): 397-408    DOI:
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鄂尔多斯盆地西缘南北差异及其形成机制
刘少峰1, 杨士恭2
1. 西北大学地质系, 西安710069;
2. 中国地质大学, 武汉430074
THE DIFFERENCES BETWEEN THE SOUTHWESTERN AND THE NORTHWESTERN ORDOS BASIN AND THEIR FORMING MECHANISM
Liu Shaofeng1, Yang Shigong2
1. Department of Northwest University, Xi'an 710069;
2. China University of Gensciences, Wuhan 430047
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摘要 鄂尔多斯盆地西缘晚三叠世南北两段存在着明显差异,北段发育由伸展正断层控制的裂陷盆地,南段发育由逆冲断层控制的前陆盆地。它们分别与阿拉善挤压构造带及东祁连褶皱逆冲带相邻。盆地沉积充填前者主要为扇三角洲体系、冲积扇-辫状河平原体系,后者主要为陡坡三角洲体系、冲积扇体系。两类盆地和盆缘构造带一起组合成非限制性侧向挤出构造,该类构造控制了研究区晚三叠世构造作用和成盆作用过程。
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刘少峰
杨士恭
关键词鄂尔多斯盆地西缘   裂陷盆地   前陆盆地   非限制性侧向涌出构造     
Abstract: There were obvious differences between the southwestern and the northwestern Ordos basin in the Late Triassic. The northwestern part developed rift basin, and the southwestern part developed foreland basin. The rift basin, controlled by Helanshan extensional normal faults, was linked with Alax compressive structural belt The foreland basin was linked with East Oilian fold thrust belt, the thrusting of which controlled the subsidence and the deposition of the basin. The stratigraphy of the two kinds of basins is divided into three sequences which are constituted饰various depositional systemsandshow different property of episodic tectonism. Inthe southwestern Ordos foreland basin, Sequence 1, Sequence 2 and Sequence 3 mainly composed of steep-sloped delta system, alluvial fan system and river system, were the depositional responses to the two times of thrust loading of East Oilian fold thrust belt and the isolated balanced subsidence after thrusting respectively, and the tmsin subsidence historycurve is represented by a two-segment convex-upward pattern. In the northwestern Ordos rift basin, the three sequences, consisting of alluvial fair braided channel plain systen and fan delta system, were the depositio}al responses to the three times of rift subsidence, and the subsidence history curve is of concave-upward pattern. The Late Triassic basins and the basin marginal strncturalbelts are arranged specially in anunconstrainedlateralextrusion, constituted by East Oilian indenter, Alax compressive wedge, Helanshan lateral margin and Sino-Mongolia buttress, which controlled the processes of tectonism and basining in the study area, and determined the differences of basin property between the southwestern and the northwestern Ordos basin. The regional study shows that the formation of the lateral extrusion is the result of the close subduction of Paleo-Tethys Domain and the passive confinement of Angarachstan Domain.
Key wordsThe western Ordos basin   Rift basin   Foreland basin   Unconstrained lateral extrusion   
收稿日期: 1995-12-04;
基金资助:地质矿产部重要基础理论和地质矿产部岩石圈构造与动力学开放研究实验室资助项目
引用本文:   
刘少峰,杨士恭. 1997, 鄂尔多斯盆地西缘南北差异及其形成机制. 地质科学, (3): 397-408.
Liu Shaofeng,Yang Shigong. THE DIFFERENCES BETWEEN THE SOUTHWESTERN AND THE NORTHWESTERN ORDOS BASIN AND THEIR FORMING MECHANISM[J]. Chinese Journal of Geology, 1997, (3): 397-408.
 
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