Results of the reinterpretation of materials of IV geotraverse of NHS (PK 295- 400) in the central part of the Holovanivsk suture zone

Authors

  • O.A. Trypolsky S.I. Subbotin Institute of Geophysics of the NAS of Ukraine, Kyiv
  • O.V. Topoliuk S.I. Subbotin Institute of Geophysics of the NAS of Ukraine, Kyiv
  • O.O. Trypolska S.I. Subbotin Institute of Geophysics of the NAS of Ukraine, Kyiv
  • O.B. Gintov S.I. Subbotin Institute of Geophysics of the NAS of Ukraine, Kyiv

DOI:

https://doi.org/10.15407/dopovidi2021.01.058

Keywords:

Holovanivsk suture zone, IV geotraverse, NHS, Talnivska fault zone

Abstract

This work provides the reinterpretation results of the research outcomes with the DSS method on geotraverse IV on section PK 295-400 in order to clarify a seismic section in the Holovanivsk area of high gravity. A number of points of diffraction and seismic sites have been identified in Earth’s crust (at a depth of 2-60 km), which gives an opportunity to considerably specify the data on the deep structure of the studied area. The position in a section of the Talnivska fault zone is clarified due to the identification of additional points of diffraction and a large number of short reflective elements at a depth of 2-8 km. In the central part of the section (PK 338-355), horizontal and inclined elements (at the depths of 2-9 km and 24-44 km) and a series of short steeply inclined reflective elements (at depths of 8-26 km) form the area of the medium which at the depth of 2-44 km differs in its characteristics from the host rocks. This allowed tracing the listriс shear zone that stretches continuously from a depth of 8 km on PK 355 to 44 km on PK 304. All this, as well as available seismotomographic data, allows us to suppose that the Talnivska fault zone is traced up to depths of 100-600 km as a boundary between blocks with different Vp velocities and degrees and gaps in the Golitsyn—Geiko layer. The listriс shear zone is connected to the main part of the Talnivska fault zone near the surface. According to the given re-interpretation of GSS data on geotraverse IV, the supply channel of the intrusive body of hyperbasites is rather narrow at depths of 60-33 km, and starting only from depth of 30 km and almost to the surface the body expands up to 15 km in width. Focusing on the area of increased Vp velocities at a depth of 2-33 km, one can assume that the main intrusive body that consists of hyperbasites and basite-Dunites, peridotites, pyroxenites, gabbro, and amphibolites, the density of which exceeds the density of rocks by 0.1-0.22 g/cm3, is located at these depths along the axis of the central part of the Holovanivsk suture zone.

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References

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Published

13.04.2021

How to Cite

Trypolsky, O., Topoliuk, . O., Trypolska, O., & Gintov, . O. (2021). Results of the reinterpretation of materials of IV geotraverse of NHS (PK 295- 400) in the central part of the Holovanivsk suture zone. Reports of the National Academy of Sciences of Ukraine, (1), 58–64. https://doi.org/10.15407/dopovidi2021.01.058

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Geosciences

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