Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods

This paper presents new results of detailed seismic tomography (ST) on the deep structure beneath the Middle Tien Shan to a depth of 60 km. For a better understanding of the detected heterogeneities, the obtained velocity models were compared with the results of magnetotelluric sounding (MTS) along...

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Main Authors: Irina Medved, Elena Bataleva, Michael Buslov
Format: Article
Language:English
Published: MDPI AG 2021-03-01
Series:Geosciences
Subjects:
Online Access:https://www.mdpi.com/2076-3263/11/3/122
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author Irina Medved
Elena Bataleva
Michael Buslov
author_facet Irina Medved
Elena Bataleva
Michael Buslov
author_sort Irina Medved
collection DOAJ
description This paper presents new results of detailed seismic tomography (ST) on the deep structure beneath the Middle Tien Shan to a depth of 60 km. For a better understanding of the detected heterogeneities, the obtained velocity models were compared with the results of magnetotelluric sounding (MTS) along the Kekemeren and Naryn profiles, running parallel to the 74 and 76 meridians, respectively. We found that in the study region the velocity characteristics and geoelectric properties correlate with each other. The high-velocity high-resistivity anomalies correspond to the parts of the Tarim and Kazakhstan-Junggar plates submerged under the Tien Shan. We revealed that the structure of the Middle Tien Shan crust is conditioned by the presence of the Central Tien Shan microcontinent. It manifests itself as two anomalies lying one below the other: the lower low-velocity low-resistivity anomaly, and the upper high-velocity high-resistivity anomaly. The fault zones, limiting the Central Tien Shan microcontinent, appear as low-velocity low-resistivity anomalies. The obtained features indicate the fluid saturation of the fault zones. According to the revealed features of the Central Tien Shan geological structure, it is assumed that the lower-crustal low-velocity layer can play a significant role in the delamination of the mantle part of the submerged plates.
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spelling doaj.art-4a7cd4f41cc649e1bce4271c3e8b6cfb2023-12-03T13:01:16ZengMDPI AGGeosciences2076-32632021-03-0111312210.3390/geosciences11030122Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding MethodsIrina Medved0Elena Bataleva1Michael Buslov2Institute of Geology and Mineralogy SB RAS, Koptyug Ave., 3, 630090 Novosibirsk, RussiaResearch Station of the Russian Academy of Sciences in Bishkek, Bishkek 720049, KyrgyzstanInstitute of Geology and Mineralogy SB RAS, Koptyug Ave., 3, 630090 Novosibirsk, RussiaThis paper presents new results of detailed seismic tomography (ST) on the deep structure beneath the Middle Tien Shan to a depth of 60 km. For a better understanding of the detected heterogeneities, the obtained velocity models were compared with the results of magnetotelluric sounding (MTS) along the Kekemeren and Naryn profiles, running parallel to the 74 and 76 meridians, respectively. We found that in the study region the velocity characteristics and geoelectric properties correlate with each other. The high-velocity high-resistivity anomalies correspond to the parts of the Tarim and Kazakhstan-Junggar plates submerged under the Tien Shan. We revealed that the structure of the Middle Tien Shan crust is conditioned by the presence of the Central Tien Shan microcontinent. It manifests itself as two anomalies lying one below the other: the lower low-velocity low-resistivity anomaly, and the upper high-velocity high-resistivity anomaly. The fault zones, limiting the Central Tien Shan microcontinent, appear as low-velocity low-resistivity anomalies. The obtained features indicate the fluid saturation of the fault zones. According to the revealed features of the Central Tien Shan geological structure, it is assumed that the lower-crustal low-velocity layer can play a significant role in the delamination of the mantle part of the submerged plates.https://www.mdpi.com/2076-3263/11/3/122seismic tomographylithosphereelectrical conductivitymagnetotelluric studiesgeodynamicsTien Shan
spellingShingle Irina Medved
Elena Bataleva
Michael Buslov
Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods
Geosciences
seismic tomography
lithosphere
electrical conductivity
magnetotelluric studies
geodynamics
Tien Shan
title Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods
title_full Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods
title_fullStr Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods
title_full_unstemmed Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods
title_short Studying the Depth Structure of the Kyrgyz Tien Shan by Using the Seismic Tomography and Magnetotelluric Sounding Methods
title_sort studying the depth structure of the kyrgyz tien shan by using the seismic tomography and magnetotelluric sounding methods
topic seismic tomography
lithosphere
electrical conductivity
magnetotelluric studies
geodynamics
Tien Shan
url https://www.mdpi.com/2076-3263/11/3/122
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