哈萨克斯坦中部构造与重力场结构

Q3 Engineering
A. Abetov, A. Uzbekov
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They may be associated with the processes of Paleozoic intracontinental rifting, with the rise of mantle matter and its emplacement into the Earth’s crust, followed by the manifestation of Late Paleozoic orogenesis, doubling of the thickness of the Earth’s crust, outpourings of magmatic formations. Originality. It is established that large gravitational minima are distinguished in areas with Hercynian folding, characterized by abnormally high amplitudes in the movement of the Earth’s crust. In the regions of the Caledonian folding, the values of gravity field anomalies of intermediate intensity and increased amplitudes of the latest movements of the Earth’s crust are manifested. Areas with Pre-Paleozoic folding have relative maxima of gravitational anomalies and minimum values of the latest movements of the Earth’s crust. 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引用次数: 0

摘要

目的。根据区域、地壳内部和局部变换计算结果,识别哈萨克斯坦中部不同时代构造元素在重力场中的表现性质。方法。重力场、地磁场、地热场、地壳最新运动、地震机制参数、构造和岩石地层学综合解释和模拟资料的综合分析。发现。前寒武纪、早加里东期和晚加里东期、早晚海西期岩石圈的区域、地壳内和局部非均质性表现不同。它们可能与古生代大陆内裂谷作用有关,地幔物质上升并侵入地壳,随后出现晚古生代造山作用,地壳厚度增加一倍,岩浆涌出。创意。在海西褶皱区,以地壳运动的异常高振幅为特征,存在较大的重力极小值。在加里东褶皱区,表现出中强度重力场异常值和地壳最新运动振幅的增加。前古生代褶皱区重力异常的相对最大值和地壳最新运动的最小值。震源集中在不同年代基底固结区交界处的固结地壳中,在地热、地磁和重力异常梯度带中。根据地壳内转换的变化,发现在温度值最小的地区,重力场值的变化范围较大,而在温度值增大的地区,重力场异常值的变化范围较小。引力场局部变换的分布表明存在高变异性异常,反映了地壳近地表物体的高频引力效应。实用价值。不同密度岩石圈的不均匀性分布、地球物理场的地磁和地热异常、地震状态的性质以及地壳的最新运动,决定了具有不同矿化类型的大地构造的形成,建议采用一套特定的合理的地球物理方法对每种构造进行搜索和勘探。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tectonics and gravity field structure of Central Kazakhstan
Purpose. Identification of the nature of the manifestation of tectonic elements of different ages in Central Kazakhstan in gravitational fields based on the results of the calculation of regional, intra-crustal and local transformants. Methodology. Synthesis and analysis of the data on integrated interpretation and modeling of gravitational, geomagnetic, geothermal fields, the latest movements of the Earth’s crust and parameters of the seismic regime, tectonics and stratigraphy of rocks. Findings. Regional, intra-crustal and local heterogeneities in the lithosphere manifest themselves differently in blocks of Precambrian rocks, Early and Late Caledonides, Early and Late Hercynides. They may be associated with the processes of Paleozoic intracontinental rifting, with the rise of mantle matter and its emplacement into the Earth’s crust, followed by the manifestation of Late Paleozoic orogenesis, doubling of the thickness of the Earth’s crust, outpourings of magmatic formations. Originality. It is established that large gravitational minima are distinguished in areas with Hercynian folding, characterized by abnormally high amplitudes in the movement of the Earth’s crust. In the regions of the Caledonian folding, the values of gravity field anomalies of intermediate intensity and increased amplitudes of the latest movements of the Earth’s crust are manifested. Areas with Pre-Paleozoic folding have relative maxima of gravitational anomalies and minimum values of the latest movements of the Earth’s crust. Earthquake sources are concentrated in the consolidated crust at the junction of areas with different ages of basement consolidation, in gradient zones of geothermal, geomagnetic and gravitational anomalies. According to the variations of the intra-crustal transformant, it was found that a wide range of changes in the values of the gravitational field corresponds to areas with minimal temperature values, whereas in areas with increased temperature values, the range of changes in the values of gravity anomalies is reduced. The distribution of the local transformant of the gravitational field indicates the existence of highly variable anomalies, which reflects the high-frequency gravitational effect of near-surface objects of the Earth’s crust. Practical value. The distribution of inhomogeneities in the lithosphere with various density, geomagnetic and geothermal anomalies of geophysical fields, the nature of the seismic regime and the latest movements of the Earth’s crust predetermined the formation of geostructures with different types of mineralization, each of which is recommended to be searched and explored by a specific rational set of geophysical methods.
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CiteScore
1.70
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0.00%
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148
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