TY - JOUR

T1 - Mantle and Crustal Sources of Magmatic Activity of Klyuchevskoy and Surrounding Volcanoes in Kamchatka Inferred From Earthquake Tomography

AU - Koulakov, Ivan

AU - Shapiro, Nikolay M.

AU - Sens-Schönfelder, Christoph

AU - Luehr, Birger G.

AU - Gordeev, Evgeny I.

AU - Jakovlev, Andrey

AU - Abkadyrov, Ilyas

AU - Chebrov, Danila V.

AU - Bushenkova, Natalia

AU - Droznina, Svetlana Y.

AU - Senyukov, Sergey L.

AU - Novgorodova, Angelika

AU - Stupina, Tatyana

N1 - Funding Information: We thank Alexander Lander, Andrey Kozhurin, Tatiana Churikova, and Boris Gordeychik for helpful discussions. This study was supported by the Russian Ministry of Education and Science (grant 14.W03.31.0033) and by the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (grant agreement 787399‐SEISMAZE). Scientists from IPGG were supported by the RFBR grant 18‐55‐52003 and Russian Science Foundation grant 20‐17‐00075. SSL is supported by the program NIOKTR АААА‐А19‐119031590060‐3. Publisher Copyright: ©2020. American Geophysical Union. All Rights Reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - Klyuchevskoy and surrounding volcanoes in central Kamchatka form the Northern Group of Volcanoes (NGV), which is an area of particularly diverse and intensive Pleistocene-Holocene volcanism. In this study, we present a new seismic tomographic model of the crust and uppermost mantle beneath NGV based on local earthquake data recorded by several permanent and temporary seismic networks including a large-scale experiment that was conducted in 2015–2016 by an international scientific consortium. Having an unprecedented resolution for this part of Kamchatka, the new model reveals many features associated with the present and past volcanic activity within the NGV. In the upper crust, we found several prominent high-velocity anomalies interpreted as traces of large basaltic shield volcanoes, which were hidden by more recent volcanic structures and sediments. We interpret the mantle structure to reflect asthenospheric flow up through a slab window below the Kamchatka-Aleutian junction that feeds the entire NGV. The interaction of the hot asthenospheric material with fluids released from the slab determines the particular volcanic activity within the NGV. We argue that the eastern branch of the Central Kamchatka Depression, which is associated with a prominent low-velocity anomaly in the uppermost mantle, was formed as a recent rift zone separating the NGV from the Kamchatka Eastern Ranges.

AB - Klyuchevskoy and surrounding volcanoes in central Kamchatka form the Northern Group of Volcanoes (NGV), which is an area of particularly diverse and intensive Pleistocene-Holocene volcanism. In this study, we present a new seismic tomographic model of the crust and uppermost mantle beneath NGV based on local earthquake data recorded by several permanent and temporary seismic networks including a large-scale experiment that was conducted in 2015–2016 by an international scientific consortium. Having an unprecedented resolution for this part of Kamchatka, the new model reveals many features associated with the present and past volcanic activity within the NGV. In the upper crust, we found several prominent high-velocity anomalies interpreted as traces of large basaltic shield volcanoes, which were hidden by more recent volcanic structures and sediments. We interpret the mantle structure to reflect asthenospheric flow up through a slab window below the Kamchatka-Aleutian junction that feeds the entire NGV. The interaction of the hot asthenospheric material with fluids released from the slab determines the particular volcanic activity within the NGV. We argue that the eastern branch of the Central Kamchatka Depression, which is associated with a prominent low-velocity anomaly in the uppermost mantle, was formed as a recent rift zone separating the NGV from the Kamchatka Eastern Ranges.

KW - Central Kamchatka Depression

KW - Kizimen

KW - Klyuchevskoy Group of Volcanoes

KW - seismic tomography

KW - Shiveluch

KW - subduction

KW - SLAB EDGE

KW - SHIVELUCH

KW - PLUMBING SYSTEM BENEATH

KW - ARC

KW - EVOLUTION

KW - TOLBACHIK VOLCANO

KW - ERUPTION

KW - RUSSIA

KW - SEISMIC TOMOGRAPHY

KW - BEZYMIANNY VOLCANO

UR - http://www.scopus.com/inward/record.url?scp=85093866636&partnerID=8YFLogxK

U2 - 10.1029/2020JB020097

DO - 10.1029/2020JB020097

M3 - Article

AN - SCOPUS:85093866636

VL - 125

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 10

M1 - e2020JB020097

ER -