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The Geodynamic Conditions for the Generation of Adakites and Nb Rich Basalts (NEAB) in Kamchatka

Avdeiko Gennady, Bergal-Kuvikas Olga (2015) The Geodynamic Conditions for the Generation of Adakites and Nb Rich Basalts (NEAB) in Kamchatka // Journal of Volcanology and Seismology. Vol. 9, No. 5. pp. 295-306.

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Item Type: Article
Title: The Geodynamic Conditions for the Generation of Adakites and Nb Rich Basalts (NEAB) in Kamchatka
Title (translation): An association of adakites and rocks with intraplate geochemical parameters (NEAB) is encoun tered in Kamchatka, even though the Pacific plate that is plunging under Kamchatka is an old (older than 93 Ma) and cold plate. Inspection and comparative analysis of NEAB–adakite associations in Kamchatka and else where at Pacific subduction zones revealed the geodynamic settings that favor heating of oceanic crust until the crust is melted and adakites are generated. Two geodynamic settings are favorable for the process: (1) an initial period of subduction with the tip of the slab melted and (2) generation of subduction windows. Both of these settings have existed in Kamchatka for a short period of time. In eastern Kamchatka, melting affected the tip of the slab in a new subduction zone that was formed during the late Miocene, as the subduction zone was blocked beneath the Sredinnyi Range as this zone jumped into its present location. The NEAB–adakite asso ciation in the northern part of the Sredinnyi Range was also formed in the tip of the slab that was part of the near Commander Islands plate. Geological sections were modeled to study conditions for the generation of NEAB–adakite associations in Kamchatka on the background of the ongoing geodynamic evolution
Language: English
Journal or Publication Title: Journal of Volcanology and Seismology
ISSN Print: 0742-0463
ISSN Online: 1819-7108
Subjects: State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.17 Тектоника > 38.17.19 Тектонофизика
Depositing User: с.н.с. О.В. Бергаль-Кувикас
Date Deposited: 08 May 2017 18:41
Last Modified: 08 May 2017 18:41
URI: http://repo.kscnet.ru/id/eprint/3019

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