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Submarine eruption-fed and resedimented pumice-rich facies: the Dogashima Formation (Izu Peninsula, Japan)

Citation

Jutzeler, M and McPhie, J and Allen, SR, Submarine eruption-fed and resedimented pumice-rich facies: the Dogashima Formation (Izu Peninsula, Japan), Bulletin of Volcanology, 76, (10) Article 867. ISSN 0258-8900 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 Springer-Verlag Berlin

DOI: doi:10.1007/s00445-014-0867-x

Abstract

In the Izu Peninsula (Japan), the Pliocene pumice-rich Dogashima Formation (4.55  0.87 Ma) displays exceptional preservation of volcaniclastic facies that were erupted and deposited in a below wave-base marine setting. It includes high-concentration density current deposits that contain clasts that were emplaced hot, indicating an eruption-fed origin. The lower part of the Dogashima 2 unit consists of a very thick sequence (<12 m) of massive grey andesite breccia restricted to the base of a submarine channel, gradationally overlain by pumice breccia, which is widespread but much thinner and finer in the overbank setting. These two breccias share similar mineralogy and crystal composition and are considered to be co-magmatic and derived from the destruction of a submarine dome by an explosive, pumice-forming eruption. The two breccias were deposited from a single, explosive eruption-fed, sustained, sea floor-hugging, water-supported, high-concentration density current in which the clasts were sorted according to their density. At the rim of the channel, localised good hydraulic sorting of clasts and stratification in the pumice breccia are interpreted to reflect local current expansion and unsteadiness rather than to be the result of hydraulic sorting of clasts during fall from a submarine eruption column and/or umbrella plume. A bimodal coarse (>1 m) pumice- and ash-rich bed overlying the breccias may be derived from delayed settling of pyroclasts from suspension. In Dogashima 1 and 2, thick cross- and planar-bedded facies composed of sub-rounded pumice clasts are intercalated with eruption-fed facies, implying inter-eruptive mass-wasting on the flank of a submarine volcano, and reworking and resedimentation by high-energy tractional currents in a below wave-base environment.

Item Details

Item Type:Refereed Article
Keywords:Dogashima, submarine eruption, Japan, submarine pumice, high-concentration density current, hydraulic sorting, eruption-fed, resedimented
Research Division:Earth Sciences
Research Group:Geology
Research Field:Volcanology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Jutzeler, M (Dr Martin Jutzeler)
Author:McPhie, J (Professor Jocelyn McPhie)
Author:Allen, SR (Dr Sharon Allen)
ID Code:98243
Year Published:2014
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:4
Deposited By:Earth Sciences
Deposited On:2015-02-06
Last Modified:2017-10-30
Downloads:0

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