Ceno-Mesozoic sedimentary and tectonic evolution in the western Qaidam basin
Ceno-Mesozoic sedimentary and tectonic evolution in the western Qaidam basin
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发表时间：
2005
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通讯作者：
Yuan Wen-fang
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作者：
Yuan Wen-fang
通过对柴达木盆地西部芒乃至色尔腾山地区地表地质、航磁、重力、大地电磁和地震资料的综合分析，认为柴达木盆地夹在北昆仑地块和色尔腾构造带之间，包括柴达木地块和祁连地块南缘两个一级构造单元和北昆仑地块北缘四个二级构造单元。祁连地块南部的昆仑地块、柴达木盆地、色尔腾构造带和苏海盆地。盆地总体结构以东昆仑山、祁连山向盆地中部挤压缓坡的构造格局为标志。盆地内部构造样式特点是从盆地边缘到中心均发育背斜，两肢多起于逆断层，形成两断夹一隆起的构造格局。压应力主要来自SW方向，NE方向起阻力作用。在两侧造山带的强烈挤压下，侏罗纪祁连造山带南缘发育非典型前陆盆地；第三纪，祁连造山带与昆仑造山带之间形成两侧前陆盆地；第四纪柴达木盆地是一个挤压、下翘的盆地。
Based on an integrated analysis of the surface geological, aeromagnetic, gravity, MT and seismic data from the area of Mangnai to Serteng Mountains in the western Qaidam basin, the authors think that the Qaidam basin is sandwiched between the North Kunlun block and Serteng tectonic belt, including two first-order tectonic units-the Qaidam block and the southern margin of the Qilian block-and four second-order tectonic units-the northern margin of the North Kunlun block, Qaidam basin, Serteng tectonic belt and Suhai lake basin in the south of the Qilian block. The general structure of the basin is marked by the tectonic framework of compressional ramp of the East Kunlun Mountains and the Qilian Mountains toward and subsidence of the central part of the basin. The tectonic style inside the basin is characterized by occurrence of anticlines from the margins to center of the basin, with two limbs mostly starting from reverse faults, developing a tectonic pattern of two faults sandwiching an uplift. The compressional stress mainly comes from SW, and the NE direction acts as a resistance. Under the strong compression from the orogenic belts on both sides, in the Jurassic an atypical foreland basin developed on the southern margin of the Qilian orogenic belt; in the Tertiary, a two-side foreland basin formed between the Qilian orogen and Kunlun orogen; in the Quaternary, the Qaidam basin is a compressional, downwarped basin.