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Neotectonics of eastern Gorny Altai; evidence from magnetotelluric data

I. S. Novikov and E. V. Pospeeva
Neotectonics of eastern Gorny Altai; evidence from magnetotelluric data
Russian Geology and Geophysics (July 2017) 58 (7): 769-777


According to 2D magnetotelluric (MT) data from northeastern and southeastern Altai, numerous neotectonic faults cut the Gorny Altai territory as a whole, as well as large basins within its limits, into blocks. Large neotectonic faults are traceable depthward in MT-based cross sections as zones of very low resistivities (below 0.5 Ohm.m). The MT data generally confirm the fault geometry inferred previously from morphotectonic and geological evidence. Fault plane dips are vertical in normal and strike-slip faults and inclined in reverse faults. The nearly vertical and dipping zones of neotectonic faults crosscut a horizontal conductivity anomaly at depths of 10-15 km. The anomaly makes a natural divide between the zones of brittle crustal failure above and ductile downward pressing of material below. It may be responsible for the high tectonic and seismic activity potential of the upper lithosphere in Gorny Altai associated with growth of mountains and crust thickening. Beneath the Chuya and Kurai large basins, the conductivity anomaly occurs at a shallow depth of 10 km and has a resistivity below 10 Ohm.m. Copyright 2017, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 58
Serial Issue: 7
Title: Neotectonics of eastern Gorny Altai; evidence from magnetotelluric data
Affiliation: Russian Academy of Sciences, V. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 769-777
Published: 201707
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 53
Accession Number: 2021-071781
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: sects., sketch maps
N49°00'00" - N51°00'00", E87°30'00" - E89°30'00"
Secondary Affiliation: Russian Academy of Sciences, A. Trofimuk Institute of Petroleum Geology and Geophysics, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202123
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