Geoelectric Interpretation of the Magnetic Monitoring Data in the Southwest Part of Baikal

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Izvestiya, Physics of the Solid Earth Pub Date : 2023-09-26 DOI:10.1134/S1069351323050087

D. A. Orekhova, I. V. Popova, S. M. Korotaev, M. S. Kruglyakov, N. M. Budnev, V. Kh. Kiriakov, I. S. Moskalev

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Abstract—

The results of the long-term gradient magnetic measurements performed in the southwest part of Baikal as supplementing the experiment on deep-water monitoring of the electric field vertical component, can be applied to study the deep geoelectric section. Baikal cannot be approximated by a two-dimensional model in the region under study. Therefore, a three-dimensional geoelectric model of the lake and adjacent territories was constructed based on the existing geological and geophysical data. However, these data are insufficient for the region where our observations are carried out. Refinement of the section upper part based on the magnetic field gradients on long bases has been performed using the neural network inversion method. Then, proceeding from the obtained basic model, alternative models were developed, which reflect the known hypotheses about the structure of the deep part of the Baikal rift section: mantle diapir and asthenospheric upwelling. The phase differences between the base-averaged field gradient and the field itself at the base site, as well as the phase differences on the ends of this base, as the most noise-proof gradient functions, are calculated for them. Based on comparison of the experimental and model frequency curves, it is concluded that the mantle diapir model fits best the experimental data, at least, in the southwest part of the Baikal rift zone.

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贝加尔湖西南部地磁监测资料的地电解释

摘要——在贝加尔湖西南部进行的长期梯度磁测量结果是对深水电场垂直分量监测实验的补充，可用于研究深部地电剖面。贝加尔湖不能用研究区域的二维模型来近似。因此，在现有地质和地球物理数据的基础上，构建了该湖及其邻近地区的三维地电模型。然而，这些数据对于我们进行观测的地区来说是不够的。基于长基底上的磁场梯度，采用神经网络反演方法对剖面上部进行了精细化处理。然后，从获得的基本模型出发，开发了替代模型，这些模型反映了贝加尔湖裂谷段深部结构的已知假设：地幔底辟和软流圈上升流。作为最具抗噪性的梯度函数，计算了基底平均场梯度和基底处的场本身之间的相位差，以及该基底末端上的相位差。通过对实验和模型频率曲线的比较，得出地幔底辟模型至少在贝加尔湖裂谷带西南部最符合实验数据的结论。

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来源期刊

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.