GEODYNAMICS

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS
A. Kushnir, T. Burakhovych, V. Ilyenko, B. Shyrkov
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引用次数: 1

Abstract

In order to study the deep structure of the southwestern Ukrainian Carpathians, where the Carpathian conductivity anomaly is located, in 2015 and 2020, modern synchronous magnetotelluric studies were carried out on the profiles of Mukachevo-Skole, Seredne-Borynya and Karpatsky at twenty-three points and the spatiotemporal distribution and the electric field on the Earth's surface, which can be used to assess the conductivity and geoelectrical structure of the region, was obtained. Processing of experimental data was performed using the software PRC_MTMV, which provides a common noise-canceling impedance estimation for synchronous magnetotellurical recordings. Curves of apparent electrical resistivity (amplitude values and phases of impedance) from 10 to 10000 s were obtained reliably. A joint analysis of the apparent resistivity and impedance phases and the formal interpretation of the deep magnetotellurical sounding curves using the Niblett transformation indicate the presence of the spatially inhomogeneous conductor both in the earth's crust and in the upper part of the upper mantle. The chain of local conductive sections in the earth's crust coincides with the axial part of the Carpathian conductivity anomaly. High conductivity of the upper mantle was recorded in the Ukrainian Carpathians from the Transcarpathian Depression to the Skiba cover. It is shown that it is not a homogeneous layer, there is a general deepening of the upper edge to the northeast from 40-60 km (Transcarpathian depression) to 90-100 km (Krosno cover). Sharp deepening along the Porkulets and Dukla covers is revealed. Information about the existence of a deep conductor and its parameters should be the basis for quantitative interpretation and construction of the 3D deep geoelectrical model.
为了研究喀尔巴阡山电导率异常所在的乌克兰西南部喀尔巴阡山脉的深部结构,2015年和2020年,对穆卡切沃·斯科尔、Seredne Borynya和Karpatsky在23个点的剖面以及地球表面的时空分布和电场进行了现代同步大地电磁研究,其可用于评估该区域的导电性和地电结构。实验数据的处理是使用软件PRC_MTMV进行的,该软件为同步大地电磁记录提供了通用的噪声消除阻抗估计。可靠地获得了10至10000s的视电阻率曲线(阻抗的振幅值和相位)。对视电阻率和阻抗相位的联合分析以及使用Niblett变换对深部大地电磁测深曲线的正式解释表明,地壳和上地幔上部都存在空间不均匀导体。地壳中的局部导电段链与喀尔巴阡山导电异常的轴向部分重合。在乌克兰喀尔巴阡山脉,从外喀尔巴底凹陷到斯基巴盖层,记录到上地幔的高电导率。结果表明,它不是一个均匀的层,上边缘向东北方向普遍加深,从40-60km(Transcarpathian凹陷)到90-100km(Krosno盖层)。Porkulets和Dukla覆盖层的深度急剧加深。关于深部导体的存在及其参数的信息应该是定量解释和构建三维深部地电模型的基础。
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来源期刊
Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
自引率
33.30%
发文量
11
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