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 40 Ar/ 39 Ar and published 14 C ages constrain voluminous mafic volcanism of the Kamchatka back-arc to Miocene (3–6 Ma) and Late Pleistocene to Holocene (20%). Younger rocks form in a back arc by lower melting degrees involving enriched mantle components. The arc front and Central Kamchatka Depr...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2010-05, Vol.159 (5), p.659-687
Main Authors: Volynets, Anna O., Churikova, Tatiana G., Wörner, Gerhard, Gordeychik, Boris N., Layer, Paul
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Geology
Geometry
Holocene
Isotopes
Lava
Melting
Mineral Resources
Mineralogy
Miocene
Original Paper
Petrology
Pleistocene
Quaternary
Seamounts
Trace elements
Volcanic rocks
Volcanoes
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Summary:New 40 Ar/ 39 Ar and published 14 C ages constrain voluminous mafic volcanism of the Kamchatka back-arc to Miocene (3–6 Ma) and Late Pleistocene to Holocene (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.
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-009-0447-9