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Evidence of early passive diapirism and tectonic evolution of salt structures in the western Kuqa depression (Quele area), southern Tianshan (NW China)

机译:天山南部(西北地区)西部库车depression陷(奎尔地区)早期被动消隐作用和盐构造的构造演化证据

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摘要

High-resolution remote-sensing imagery, seismic, well-log, magnetotelluric data, and field observations are integrated to investigate the Cenozoic salt-related structures in the western Kuqa depression (Quele area), southern Tianshan, NW China. Field observations of Oligocene to Miocene halokinetic sequences suggest early passive diapirism was developed in the Kuqa depression. More evidence also indicate that the progradation of the Paleogene Quele alluvial fan and basement steps have important controlling roles on the formation of the early salt structures. Rock salt was driven by the progradation wedge to flow bas inward, then basement steps would provide resistance and hold the positions of early salt structures. On the basis of the kinematic model, it is suggested that the early Quele salt wall, which acts as a stress concentration zone, is deformed to the Quele salt nappe during the subsequent regional shortening, and controls the changes of along-strike geometries in the Quele area. (C) 2016 Elsevier Ltd. All rights reserved.
机译:高分辨率遥感影像,地震,测井,大地电磁数据和野外观测资料相结合,以研究中国西北天山南部库车depression陷(奎尔地区)西部与新生代盐有关的结构。渐新世至中新世卤代动力学序列的野外观察表明,库车depression陷发展了早期的被动二叠纪。更多证据还表明,古近纪Quele冲积扇和基底台阶的发育对早期盐结构的形成具有重要的控制作用。盐分由楔形物驱动,向内流动,然后地下台阶将提供阻力并保持早期盐分结构的位置。在运动学模型的基础上,建议将早期的Quele盐壁作为应力集中区,在随后的区域缩短过程中变形为Quele盐岩,并控制沿罢工几何形状的变化。 Quele地区。 (C)2016 Elsevier Ltd.保留所有权利。

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