多学科地质调查、地震剖面和重力测量方法在褶皱冲断带研究中的应用——以天山北麓呼图壁河为例

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Ke-Shi Chen, C. Gumiaux, R. Augier, Yan Chen, Yan-Hui Mei, Wei Lin, Qingchen Wang
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引用次数: 5

摘要

褶皱冲断带是造山带研究的热点。然而,单一的地质或地球物理学科往往对褶皱冲断带的几何形状提供多种解决方案。本文采用地质与地球物理相结合的多学科方法,以呼图壁河剖面为例,对天山北麓褶皱冲断带的几何形态进行了研究。首先,我们进行了认真的地质调查,获得了地表构造资料。其次,根据地面资料和钻井资料,重新解释了油气地震剖面;而在与准噶尔盆地接触带,地震剖面缺失。因此,我们沿着这条剖面进行了重力测量和正演模拟,其中包含了基底和沉积物的密度。结果表明,呼图壁河剖面不存在天山北翼断裂,盆地沉积物可沿盆地向山内连续迁移。这表明山盆接触带的构造构造是多变的,如金沟河西段显示天山基底向北冲覆盆地沉积物。基于平衡剖面技术,恢复剖面如图4所示。缩短8公里。与以往研究结果相比,这表明天山北麓地区存在非均匀变形。这也意味着该多学科方法可以广泛应用于褶皱冲断带。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A multidiscipline method of geological survey,seismic profile and gravity measurement applied to fold-and-thrust belt:a case study along the Hutubi River in the northern piedmont of Tianshan
Fold-and-thrust belts are hot topics in the research of orogens. However, the single geological or geophysical discipline often provides multisolutions on the geometry of a fold-and-thrust belt. We introduce here a multidisciplinary method combining geological and geophysical methods, take the Hutubi River section as a case to study the geometry of the fold-and-thrust belt in the northern piedmont of Tianshan. Firstly, we have carefully taken geological survey and got structural data on the surface. Secondly, petroleum seismic profile was re-interpreted based on the surface data and drilled wells. However, the seismic profile is absent in the contact zone between the mountain and the Junggar basin. We therefore carried out gravity measurements and forward modeling along this profile with the densities of the basement and sediments. The result shows that the northern flank fault of Tianshan doesn't exist along the Hutubi River profile, and the basin sediments could be continually followed from the basin to the mountain interior. This indicates that the tectonic structures in the contact zones between the mountain and the basin are variable, as the western section in the Jingou River section shows that the Tianshan basement thrusts northward on the basin sediments. Based on the balance-section technology, the restored section shows 4. 8 km of shortening. Comparing with previous results, this indicates the heterogeneous deformation along the northern piedmont of Tianshan. It also implies that this multidisciplinary method could be widely used in the fold-and-thrust belt.
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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