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Stratigraphy, structure and geology of Late Miocene Verkhneavachinskaya caldera with basaltic–andesitic ignimbrites at Eastern Kamchatka

Bergal-Kuvikas Olga, Leonov Vladimir, Rogozin Aleksei, Bindeman Ilya, Kliapitskiy Evgeniy, Churikova Tatiana (2019) Stratigraphy, structure and geology of Late Miocene Verkhneavachinskaya caldera with basaltic–andesitic ignimbrites at Eastern Kamchatka // Journal of Geosciences. No. 64. pp. 229-250. doi: 10.3190/jgeosci.295.

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Official URL: http://www.jgeosci.org/detail/jgeosci.295

Abstract

We newly describe a paleovolcano in the Eastern Volcanic Belt of Kamchatka named Verkhneavachinskaya caldera (VC). According to geological mapping of the area covered by the deposits, mainly lava-like ignimbrites, the VC is interpreted as an eroded paleoshield volcano with a summit caldera. It is one of the largest (10 × 12 km diameter) and oldest (c. 5.78-5.58 Ma as newly dated by the Ar-Ar method) currently known paleovolcanoes in Kamchatka with such a good preservation. The lava-like welded ignimbrites correspond to basaltic andesite and andesite and are more mafic than pyroclastic rocks from the other post-Pliocene calderas in Kamchatka. The deposits of VC are interbedded layers of welded ignimbrites and volcaniclastic deposits. These deposits were formed during long-lived, continuous eruptions of hot pyroclastic flows and subsequent accumulations of volcaniclastic deposits (e.g. lahars). The VC provides new insights into the early stages of Eastern Volcanic Belt development after the Kronotsky Arc Terrane accretion. This potentially explains the origin of voluminous basaltic-andesitic ignimbrites formed on thin crust during the initial stage of the arc formation.
Item Type: Article
Title: Stratigraphy, structure and geology of Late Miocene Verkhneavachinskaya caldera with basaltic–andesitic ignimbrites at Eastern Kamchatka
Language: English
Journal or Publication Title: Journal of Geosciences
ISSN Print: 1802-6222
ISSN Online: 1803-1943
Subjects: State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.21 Региональная геология > 38.21.03 Методы геологической съемки
Depositing User: с.н.с. О.В. Бергаль-Кувикас
Date Deposited: 13 Feb 2020 03:15
Last Modified: 13 Feb 2020 03:16
URI: http://repo.kscnet.ru/id/eprint/3814

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