盐层厚度对褶皱拼接样式的影响——以库车褶皱冲断带西段前缘背斜带为例
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The Effect of Salt Thickness on Fold Lateral Linkage:A Case Study of the Anticlines in the Leading Edge of the Western Kuqa Fold and Thrust Belt, South Tianshan
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    摘要:

    本文综合利用钻井、地震反射剖面、遥感卫星影像和数字高程模型数据,分析了库车褶皱冲断带前缘盐层厚度的变化特征及其对背斜样式(波长W)、褶皱拼接样式的影响。研究表明,秋里塔格构造带由于下伏盐层初始厚度约10 km,且存在大量外来盐岩流入,发育延伸大约300 km的背斜带;其背斜初始波长约22 km,枢纽间距(D)达到103 km的背斜也能发生斜向拼接。然而,喀拉玉尔滚构造带下伏盐层初始厚度为01~09 km,且由西往东减薄;它主要由雁列式背斜构成,背斜波长较小(大约7~11 km)。由于下伏盐层厚度不同,背斜核部断层发育特征也存在明显差异,导致枢纽间距(D)为65 km的中喀、南喀背斜发生斜向拼接,而枢纽间距较小(D=61 km)的北喀背斜却成为孤立背斜。因此,我们认为盐层的厚度不同导致了褶皱波长和断层发育特征的差异,进而影响背斜之间能否发生拼接。本文的研究结果需要得到进一步深入研究的验证,但势必将有助于加深对于挤压环境下盐构造变形样式及其对褶皱发育的控制作用的理解。

    Abstract:

    In this study, we analyzed the variation of salt layer thickness in the leading edge of the western Kuqa fold and thrust belt and its effects on structural style, wavelength and fold lateral linkage of the anticlines using integrated seismic reflection profiles, drilling, remote sensing imagery and DEM data. The results indicate that the initial salt sediments of ~1.0 km together with allochthonous salt facilitated the formation of a ~300 km long anticline with wavelengths of ~22 km in the Qiulitage structural belt by lateral linkage of individual fold segments with a hinge distance as much as 10.3 km. However, the initial thickness of salt underlying the Kalayuergun structural belt is 01~09 km, and decreases from west to east. The difference in salt thickness resulted in contrasting fault patterns above the core of anticlines in this belt. As a result, the lateral linkage occurred between Nanka and Zhongka anticlines with a hinge distance of ~65 km, whereas the Beika anticline developed as an isolated fold even if a shorter hinge distance of ~61 km. Therefore, we suggest that the thickness of salt layers resulted in difference of fold wavelength and fault patterns, and further affect whether lateral linkage is able to occur between individual fold segments. Although the results of this study need to be validated by further investigations, we still believe they can help us in better understanding the deformation of compressional salt structures and their controls on fold development.

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唐鹏程,饶刚,李世琴,余养里.2018.盐层厚度对褶皱拼接样式的影响——以库车褶皱冲断带西段前缘背斜带为例[J].地质学报,92(3):437-448.
TANG Pengcheng, RAO Gang, LI Shiqin, YU Yangli.2018. The Effect of Salt Thickness on Fold Lateral Linkage:A Case Study of the Anticlines in the Leading Edge of the Western Kuqa Fold and Thrust Belt, South Tianshan[J]. Acta Geologica Sinica,92(3):437-448.

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  • 在线发布日期: 2018-03-19
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