库车坳陷西段褶皱-冲断带前缘盐底辟构造特征及形成机制
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摘要
本文结合遥感影像解译图,野外地质踏勘,地震剖面解析和物理模拟实验,对库车坳陷西段却勒—阿瓦特地区褶皱-冲断带前缘的三个出露地表的盐底辟构造特征和形成机制进行了研究,研究结果表明却勒—阿瓦特盐推覆构造、温宿盐场盐丘和温宿大峡谷盐底辟构造形成演化主要受控于初始含盐盆地宽度、早期盐底辟构造和区域挤压应力作用.含盐盆地宽度的变化是盆地内分段差异构造变形的主控因素,而早期盐底辟构造则对后期盆地挤压盐构造变形有重要的影响.模拟实验结果表明却勒—阿瓦特盐推覆构造是盐盆地内早期盐底辟构造受后期挤压变形的产物.温宿盐场和温宿大峡谷盐底辟则是盆地边缘盐背斜受挤压作用和剥蚀作用影响而出露地表形成的盐底辟构造.
Based on remote sensing image,field works,seismic profiles and physical modeling,the structural features and formation mechanism of three exposed salt diapirs in the fold-thrust frontal belt of Quele-Awate area,Western Kuqa depression have been researched.Research results show that the formation of the salt nappe in Quele(Awate)area,the salt diapirs in Wensu Saltern and Wensu Canyon was controlled by the width of the initial salt basin,the early passive salt diapir and the regional compression stress.The variable width of the salt basin has a major controlling influence on the differential structural deformation in different longitudinal segmentations from Quele area toAwate area in the western Kuqa depression.Also,the early passive salt diapir has an important controlling role on the subsequent compressional structural deformation.Model results demonstrate that the Quele-Awate salt nappe was the result of the subsequent compressional structural deformation of the early passive diapir in the basin.The salt diapirs in Wensu Saltern and Wensu Canyon were resulted from the erosion of salt anticlines in the margin of the salt basin.
引文
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