CENOZOIC DEFORMATION FEATURES AND TIME OF EASTERN ALTUN FAULT IN HUAHAI OF GANSU PROVINCE, NORTHWESTERN CHINA
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摘要: 在地表地质调查并结合钻井资料分析的基础上,主要通过地震剖面的精细地质解释,对阿尔金断裂东段的构造变形特征进行了系统分析。认为阿尔金断裂经阿克塞至肃北向北东东方向延伸,既没有止于玉门市西北的宽台山,也没有延伸至金塔盆地,而是止于其间的花海盆地花探7井东侧。阿尔金断裂花海段的变形时间主要为渐新世晚期、上新世末期和晚更新世末,以后者最为强烈。与红柳峡段的对比说明变形强度自西向东逐渐减弱,变形方式主要为走滑兼逆冲,主要构造样式为半花状构造,并派生有一系列向南西西方向收敛的弧形断裂。Abstract: Based on the seismic profile interpretation as well as ground survey and well data, the paper presented structural deformation features of the eastern sector of Altun fault. It extended NEE-wards from Akesai to northern Gansu, and did not terminate in the Jinta Basin or the Kuantaishan mountains to the northwest of Yumen city. Actually, it ended at the east of the Well Huatan 7 in the Huahai Basin, a Meso-Cenozoic basin located between the Kuantaishan mountains and the Jinta Basin. The structural deformation of the eastern sector of Altun fault occurred mainly in three periods: Late Oligocene, end of Pliocene and end of Late Pleistocene, with the later being most violent one. Spacially, the deformation became weakened from the west to the east. The deformational mode might be strike-slipping with thrusting, which gave rise to a group of thrusts which made up an arcuate fracture system disappeared SWW-wards, with a main tectonic style being a half-flower structure in profile.
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Key words:
- The Altun fault /
- Structural deformation /
- Deformation times /
- The Huahai Basin
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