TY - JOUR

T1 - Peculiarities of Subduction in the Junction of the Kuril–Kamchatka and Aleutian Island Arcs

AU - Gordeev, E. I.

AU - Koulakov, I. Yu

AU - Shapiro, N. M.

N1 - Funding Information: This work was supported by the Ministry of Education and Science of the Russian Federation (Megagrant no. 14.W03.31.0033) and by the Russian Foundation for Basic Research (project no. 18–55–52003). Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10

Y1 - 2020/10

N2 - The peculiarities of the junction between the Kuril–Kamchatka and Aleutian island arcs are studied using different techniques and experimental data. The models of medium structure that were obtained by using surface wave tomography and studies of S-wave anisotropy in the asthenosphere beneath the subduction plate detected an ascending asthenospheric flow of hot material and fluids along the northern boundary of the lithospheric plate. The presence of the ascending asthenospheric flow in the junction zone has been recently confirmed by detailed body-wave seismic tomography. Additional feeding of the Klyuchevskoi volcanic group from the asthenospheric flow explains the great difference in the eruptive activity of these volcanoes in comparison to other volcanoes located in the Eastern volcanic belt of Kamchatka. Comparative study of Quaternary volcanoes lying in the Eastern volcanic belt has revealed a strongly pronounced decreasing productivity from north to the south, i.e., with distance from the end of the subduction plate. This reduction is likely related to a depletion in the invasion of magmatic melts along the subduction plate from the asthenospheric flow in the junction of the Kuril–Kamchatka and Aleutian island arcs.

AB - The peculiarities of the junction between the Kuril–Kamchatka and Aleutian island arcs are studied using different techniques and experimental data. The models of medium structure that were obtained by using surface wave tomography and studies of S-wave anisotropy in the asthenosphere beneath the subduction plate detected an ascending asthenospheric flow of hot material and fluids along the northern boundary of the lithospheric plate. The presence of the ascending asthenospheric flow in the junction zone has been recently confirmed by detailed body-wave seismic tomography. Additional feeding of the Klyuchevskoi volcanic group from the asthenospheric flow explains the great difference in the eruptive activity of these volcanoes in comparison to other volcanoes located in the Eastern volcanic belt of Kamchatka. Comparative study of Quaternary volcanoes lying in the Eastern volcanic belt has revealed a strongly pronounced decreasing productivity from north to the south, i.e., with distance from the end of the subduction plate. This reduction is likely related to a depletion in the invasion of magmatic melts along the subduction plate from the asthenospheric flow in the junction of the Kuril–Kamchatka and Aleutian island arcs.

KW - asthenosphere flow

KW - junction of the Kuril–Kamchatka and Aleutian island arcs

KW - lithospheric plate

KW - seismic tomography

KW - subduction

UR - http://www.scopus.com/inward/record.url?scp=85096420801&partnerID=8YFLogxK

U2 - 10.1134/S1028334X20100050

DO - 10.1134/S1028334X20100050

M3 - Article

AN - SCOPUS:85096420801

VL - 494

SP - 790

EP - 794

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

IS - 2

ER -