Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction

New 40Ar/39Ar and published 14C ages constrain voluminous mafic volcanism of the Kamchatka back-arc to Miocene (3–6 Ma) and Late Pleistocene to Holocene (<1 Ma) times. Trace elements and isotopic compositions show that older rocks derived from a depleted mantle through subduction fluid-flux melti...

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Main Authors: Volynets, Anna, Churikova, Tatiana, Wörner, Gerhard, Gordeychik, Boris, Layer, Paul
Format: Text
Language:unknown
Published: Springer-Verlag 2009
Subjects:
Pacific
Kamchatka
Online Access:https://dx.doi.org/10.23689/fidgeo-2794
https://e-docs.geo-leo.de/handle/11858/7107
id ftdatacite:10.23689/fidgeo-2794
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spelling ftdatacite:10.23689/fidgeo-2794 2023-05-15T16:58:26+02:00 Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction Volynets, Anna Churikova, Tatiana Wörner, Gerhard Gordeychik, Boris Layer, Paul 2009 https://dx.doi.org/10.23689/fidgeo-2794 https://e-docs.geo-leo.de/handle/11858/7107 unknown Springer-Verlag Text Article article-journal ScholarlyArticle 2009 ftdatacite https://doi.org/10.23689/fidgeo-2794 2021-11-05T12:55:41Z New 40Ar/39Ar and published 14C ages constrain voluminous mafic volcanism of the Kamchatka back-arc to Miocene (3–6 Ma) and Late Pleistocene to Holocene (<1 Ma) times. Trace elements and isotopic compositions show that older rocks derived from a depleted mantle through subduction fluid-flux melting (>20%). Younger rocks form in a back arc by lower melting degrees involving enriched mantle components. The arc front and Central Kamchatka Depression are also underlain by plateau lavas and shield volcanoes of Late Pleistocene age. The focus of these voluminous eruptions thus migrated in time and may be the result of a high fluid flux in a setting where the Emperor seamount subducts and the slab steepens during rollback during terrain accretions. The northern termination of Holocene volcanism locates the edge of the subducting Pacific plate below Kamchatka, a “slab-edge-effect” is not observed in the back arc region. Text Kamchatka DataCite Metadata Store (German National Library of Science and Technology) Pacific
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
description New 40Ar/39Ar and published 14C ages constrain voluminous mafic volcanism of the Kamchatka back-arc to Miocene (3–6 Ma) and Late Pleistocene to Holocene (<1 Ma) times. Trace elements and isotopic compositions show that older rocks derived from a depleted mantle through subduction fluid-flux melting (>20%). Younger rocks form in a back arc by lower melting degrees involving enriched mantle components. The arc front and Central Kamchatka Depression are also underlain by plateau lavas and shield volcanoes of Late Pleistocene age. The focus of these voluminous eruptions thus migrated in time and may be the result of a high fluid flux in a setting where the Emperor seamount subducts and the slab steepens during rollback during terrain accretions. The northern termination of Holocene volcanism locates the edge of the subducting Pacific plate below Kamchatka, a “slab-edge-effect” is not observed in the back arc region.
format Text
author Volynets, Anna
Churikova, Tatiana
Wörner, Gerhard
Gordeychik, Boris
Layer, Paul
spellingShingle Volynets, Anna
Churikova, Tatiana
Wörner, Gerhard
Gordeychik, Boris
Layer, Paul
Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
author_facet Volynets, Anna
Churikova, Tatiana
Wörner, Gerhard
Gordeychik, Boris
Layer, Paul
author_sort Volynets, Anna
title Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
title_short Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
title_full Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
title_fullStr Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
title_full_unstemmed Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
title_sort mafic late miocene–quaternary volcanic rocks in the kamchatka back arc region: implications for subduction geometry and slab history at the pacific–aleutian junction
publisher Springer-Verlag
publishDate 2009
url https://dx.doi.org/10.23689/fidgeo-2794
https://e-docs.geo-leo.de/handle/11858/7107
geographic Pacific
geographic_facet Pacific
genre Kamchatka
genre_facet Kamchatka
op_doi https://doi.org/10.23689/fidgeo-2794
_version_ 1766050421955100672

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