TY - JOUR

T1 - Late Pleistocene Catastrophic Landslide from the Balaganchik Ridge

T2 - Evidence from the Mitoga 2 Reference Section (Western Kamchatka)

AU - Pevzner, M. M.

AU - Maksimov, F. E.

AU - Karimov, T. D.

AU - Levchenko, S. B.

AU - Nechushkin, R. I.

AU - Grigor’ev, V. A.

AU - Petrov, A. Yu

AU - Kuznetsov, V. Yu

AU - Uspenskaya, O. N.

AU - Kushcheva, Yu V.

N1 - Funding Information: This work was accomplished in accordance with the State Task of Geological Institute of the Russian Academy of Sciences (project no. 0135-2019-0059) and financially supported by the Russian Foundation for Basic Research (project nos. 17-05-00352 (field works and analytical studies) and 20-05-00085 (analysis of data and paper writing)). Publisher Copyright: © 2021, Pleiades Publishing, Inc. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/1/30

Y1 - 2021/1/30

N2 - Abstract: A new reference section of the Okhotsk seaside of Kamchatka in the Mitoga 2 River area is studied and dated for the first time (14C and 230Th/U). Sedimentary deposits were correlated with the previously known sections in the Khomutina‒Mitoga interfluve. It has been established that the sequence of “gray silts and clays” represents deposits of a large lake-type estuary, which began to swamp about 90–80 ka BP, and all sediments overlapping the silts began to form no earlier than 90 ka BP (second half of MIS 5). Deposits of a catastrophic collapse (clastic mass transport over about 100 km, area ≥1500 km2, volume ≥15 km3), which descended from the Balaganchik Ridge about 90‒80 ka BP, were identified. Two main facies were established: dispersed basal layer (“moraine-type loam” sequence) and landslide proper sediments (conglomerates). Valleys of the Bystraya and Plotnikova rivers were blocked by a collapse, resulting in the formation of a large dammed lake. The catastrophic drainage of the lake could occur about 37 ka BP. Deposits related to the dam breakthrough are recorded between the Mitoga 2 River and Zuikovo Settlement on the Okhotsk coast.

AB - Abstract: A new reference section of the Okhotsk seaside of Kamchatka in the Mitoga 2 River area is studied and dated for the first time (14C and 230Th/U). Sedimentary deposits were correlated with the previously known sections in the Khomutina‒Mitoga interfluve. It has been established that the sequence of “gray silts and clays” represents deposits of a large lake-type estuary, which began to swamp about 90–80 ka BP, and all sediments overlapping the silts began to form no earlier than 90 ka BP (second half of MIS 5). Deposits of a catastrophic collapse (clastic mass transport over about 100 km, area ≥1500 km2, volume ≥15 km3), which descended from the Balaganchik Ridge about 90‒80 ka BP, were identified. Two main facies were established: dispersed basal layer (“moraine-type loam” sequence) and landslide proper sediments (conglomerates). Valleys of the Bystraya and Plotnikova rivers were blocked by a collapse, resulting in the formation of a large dammed lake. The catastrophic drainage of the lake could occur about 37 ka BP. Deposits related to the dam breakthrough are recorded between the Mitoga 2 River and Zuikovo Settlement on the Okhotsk coast.

KW - catastrophic landslide

KW - dammed lake

KW - Late Pleistocene

KW - peat

KW - radiocarbon and U–Th dating

KW - western Kamchatka

UR - http://www.scopus.com/inward/record.url?scp=85100295095&partnerID=8YFLogxK

U2 - 10.1134/S002449022006005X

DO - 10.1134/S002449022006005X

M3 - Article

AN - SCOPUS:85100295095

VL - 56

SP - 71

EP - 88

JO - Lithology and Mineral Resources

JF - Lithology and Mineral Resources

SN - 0024-4902

IS - 1

ER -