TY  - JOUR
A1  - Volynets, Anna
A1  - Churikova, Tatiana
A1  - Wörner, Gerhard
A1  - Gordeychik, Boris
A1  - Layer, Paul
T1  - Mafic Late Miocene–Quaternary volcanic rocks in the Kamchatka back arc region: implications for subduction geometry and slab history at the Pacific–Aleutian junction
Y1  - 2009
VL  - 159
IS  - 5
SP  - 659
EP  - 687
JF  - Contributions to Mineralogy and Petrology
JF  - Contributions to Mineralogy and Petrology
DO  - 10.1007/s00410-009-0447-9
DO  - 10.23689/fidgeo-2794
PB  - Springer-Verlag
N2  - 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7107
ER  -