Layered Tectonics and Mathematical Modeling of the Geodynamic Setting of the Fergana Depression (Uzbekistan)

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
I. U. Atabekov, Yu. M. Sadykov, J. K. Mamarakhimov
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引用次数: 0

Abstract

The geodynamic features of the Fergana intermontane depression are the presence of rifting during regional meridional compression and the discrepancy between the location of earthquake sources and boundaries of inhomogeneities in crustal layers. The first feature is solved using the ideas of multistage plate tectonics, which also makes it possible to assess the oil and gas content of the basin. However, existing hypothetical tectonic schemes are not supported by mathematical calculations. To clarify these features, we have developed a mathematical model of the stress–strain state with respect to one of the cross sections of the crust in the Fergana depression, which has a zonally inhomogeneous density structure. The results of the mathematical model show that the presence of blocks with different densities creates displacements under the impact of horizontal compressive stresses. It is also shown that the isolines of maximum tangential stresses are located close to the boundaries of inhomogeneous zones, which indicates large errors in determining earthquake hypocenters.

Abstract Image

费尔干纳凹陷(乌兹别克斯坦)的层状构造和地球动力环境数学建模
摘要 费尔干纳山间凹陷的地球动力学特征是区域经向压缩过程中存在断裂,以及地震源位置与地壳层不均匀性边界之间存在差异。利用多阶段板块构造学的观点解决了第一个问题,这也使得评估盆地的石油和天然气含量成为可能。然而,现有的假设构造方案并没有数学计算的支持。为了澄清这些特征,我们针对费尔干纳凹陷地壳的一个横截面,建立了一个应力-应变状态数学模型,该横截面具有带状不均匀密度结构。数学模型的结果表明,不同密度块体的存在会在水平压应力的影响下产生位移。结果还表明,最大切向应力的孤立线位于非均质区的边界附近,这表明在确定地震次中心时存在较大误差。
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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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