库车前陆盆地与盐有关的秋里梯褶皱和推覆带的分段差异

Processes Pub Date : 2024-08-09 DOI:10.3390/pr12081672
Yingzhong Zhu, Chuanxin Li, Yuhang Zhang, Yibo Zhao, Tulujun Gulifeire
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引用次数: 0

摘要

秋里提奇褶皱与推力带(Qiulitage fold and thrust belt,QFTB)位于库车凹陷,展现出壮观的盐构造,具有明确的几何和运动学特征,因此在推动全球盐构造研究方面发挥着重要作用。这项研究以区域地质、测井和新获得的三维地震数据为基础,应用与盐有关的断层结构原理解释地震数据,并通过对结构几何和运动学进行定量研究,恢复库车凹陷内秋里提奇褶皱和推力带的结构平衡。研究结果表明,其东段和西段的盐结构存在明显差异,在垂直方向上分为上盐、盐层和下盐,在水平方向上分为四个部分。迪纳段为单排基底侵入型推力断层,东青藏高原段为覆盖层侵入型剥离推力断层,中青藏高原段为多排覆盖层侵入型剥离推力断层,前缘形成构造楔,西青藏高原段为盲推断层。在康村地层的沉积过程中,东部剖面的缩短率为 18%,中部为 14%,西部为 9%。对于库车地层,东部剖面的缩短率为 10%,中部为 9%,西部为 3%,这表明东部的变形比西部更为显著。定量统计分析显示,不同类型的剥离、古地貌和东北向压应力对秋里塔奇褶皱推覆带产生了控制作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Segmentation Differences of the Salt-Related Qiulitage Fold and Thrust Belt in the Kuqa Foreland Basin
The Qiulitage fold and thrust belt (QFTB) is situated in the Kuqa Depression, exhibiting spectacular salt structures with well-defined geometric and kinematic characteristics and thereby playing a significant role in advancing the study of salt structures worldwide. This research, based on regional geology, well logging, and newly acquired three-dimensional seismic data, applies principles of salt-related fault structures to interpret seismic data and restore structural equilibrium in the Qiulitage fold and thrust belt within the Kuqa Depression by conducting quantitative studies on structural geometry and kinematics. Results indicate clear differences in salt structures between the eastern and western segments of it, vertically divided into upper salt, salt layer, and lower salt and horizontally into four parts. The Dina segment features a single-row basement-involved thrust fault, the East QFTB segment displays detachment thrust faults involving cover layers, the Central QFTB segment exhibits detachment thrust faults involving multiple rows of cover layers, the leading edge forms structural wedges, and the West QFTB segment develops blind-thrust faults. During the deposition of the Kangcun formation, the eastern profile experiences an 18% shortening rate, 14% in the central part, and 9% in the western part. For the Kuqa formation, the eastern profile experiences a 10% shortening rate, 9% in the central part, and 3% in the western part, indicating more significant deformation in the east than in the west. Quantitative statistical analysis reveals that different types of detachments, paleogeomorphology, and northeast-directed compressive stress exert control over the Qiulitage fold-thrust belt.
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