The northern edge of Pacific plate position near Kamchatka-Aleutian junction

Gordeychik, B.; Churikova, T.; Volynets, A.; Wörner, G.; Layer, P.

Авторы: Gordeychik B., Churikova T., Volynets A., Wörner G., Layer P.
Сборник: European Geosciences Union General Assembly 2010 [USB flash drive]
Серия: Geophysical Research Abstracts
Том: 12
Тезисы
Год издания: 2010
Издательство: Copernicus GmbH on behalf of the European Geosciences Union
Местоположение издательства: Germany
Первая страница: EGU2010-12504
Последняя страница: EGU2010-12504
Аннотация: Two geochemical transects were carried out through Kamchatka: one previously studied SE-NW across the arc and one SW-NE trending along the Sredinny Range (SR) back arc zone. These data with Ar-Ar dating constrain magma source in space and time and allows us to relate these to tectonic position setting of the region at a given time. The cross arc transect from Gamchen volcano in Eastern Volcanic Front (EVF) through Central Kamchatka Depression (CKD) to Ichinsky volcano in SR based on Quaternary rocks showed continuous geochemical zonation from arc front to back arc of present subduction zone, including strong and gradual increase in LILE, LREE and HFSE in whole rocks. The transect along the SR from the Achtang lava field to Tekletunup volcano (the back arc zone) comprises two age groups of volcanic rocks each with uniform in geochemical features. Late Miocene-Pliocene rocks (3-6 Ma) represent voluminous plateau lavas of depleted basalts with low HFSE and HREE. Fluid-mobile elements are enriched and enrichment patterns are in fact similar to the typical arc front lavas. The younger group of Quaternary rocks (<1 Ma) is represented by monogenetic cones and stratovolcanoes that combine the typical LILE/HFSE-enrichment of a subduction setting with enrichment in all incompatible elements.
Добавил в систему: Гордейчик Борис Николаевич

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