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Deep Structure of the Baikal Rift Zone and Central Mongolia
- Authors: Vinnik L.P.1, Delitsyn L.L.1, Makeeva L.I.1, Oreshin S.I.1
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Affiliations:
- Shmidt Institute of Physics of the Earth, Russian Academy of Sciences
- Issue: No 2 (2024)
- Pages: 3-13
- Section: Articles
- URL: https://journal-vniispk.ru/0002-3337/article/view/255518
- DOI: https://doi.org/10.31857/S0002333724020014
- EDN: https://elibrary.ru/BUQILD
- ID: 255518
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Abstract
The upper mantle and the transition zone of the Baikal rift zone (BRZ) are studied. The observations are analyzed using P-wave receiver functions. It is found that in the BRZ central and northeastern part, the P410s converted seismic phase is preceded by a precursory wave with negative polarity which is formed in the low S-wave velocity layer at a depth of 350–410 km. A similar precursory wave with low S-wave velocity and negative polarity is formed at a depth of 600–660 km. The low-velocity layers are interpreted as resulting from the hydration of wadsleyite and ringwoodite during the subduction of the Pacific lithosphere. A similar study of the mantle in Central Mongolia found no expected signs of hydration. Modeling of the lithosphere–asthenosphere system in Central Mongolia by joint inversion of the body wave receiver functions and surface wave dispersion curves reveals a very thin lithospheric lid beneath Khangai and a thick layered asthenosphere to a depth of 200 km with a lithospheric inclusion between low-velocity layers.
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About the authors
L. P. Vinnik
Shmidt Institute of Physics of the Earth, Russian Academy of Sciences
Author for correspondence.
Email: vinnik@ifz.ru
Russian Federation, Moscow
L. L. Delitsyn
Shmidt Institute of Physics of the Earth, Russian Academy of Sciences
Email: vinnik@ifz.ru
Russian Federation, Moscow
L. I. Makeeva
Shmidt Institute of Physics of the Earth, Russian Academy of Sciences
Email: mak@ifz.ru
Russian Federation, Moscow
S. I. Oreshin
Shmidt Institute of Physics of the Earth, Russian Academy of Sciences
Email: vinnik@ifz.ru
Russian Federation, Moscow
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Supplementary files
Supplementary Files
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JATS XML
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Fig. 1. Location of seismic stations. Stationary stations are shown by black triangles; temporary stations of the Central Mongolian Seismic Experiment - empty triangles; MOBAL network - circles. Inset - scheme of the Vitimsky volcanic field location.
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Fig. 2. Results of summarizing the receiver functions: HV, Khubsugul; AT, Gobi-Altai; HDWEST_2, northwest Khangai; HDWEST_3, southwest Khangai; HDEAST_4, northeast Khangai; HDEAST_5, southeast Khangai. The arrows show the arrivals of P410s and P660s waves.
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Fig. 3. CCP image of the total PRF of Ps exchange waves at latitude 47° N. On the horizontal axis - longitude (deg), on the vertical axis - depth (km).
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Fig. 4. Total receiving functions of the Ps waveform for a cell centered at 48° N, 101° E. The theoretical total PRFs are shown with a dashed line.
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Fig. 5. Two-dimensional velocity profiles of transverse waves. From top to bottom: meridional - 100° E, diagonal - 30° NE, latitudinal - 48° N. The color scale shows the absolute values of transverse wave velocities.
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Fig. 6. Horizontal sections of transverse wave velocity models (70, 100, 130, 160 km). The color scale shows the absolute values of transverse wave velocities.
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