Pliocene-Quaternary Submarine Pumice Deposits in the Sumisu Rift Area, Izu-Bonin Arc
Published:January 01, 1991
A. Nishimura, K. M. Marsaglia, K. S. Rodolfo, A. Colella, R. N. Hiscott, K. Tazaki, J. B. Gill, T. Janecek, J. Firth, M. Isiminger-Kelso, Y. Herman, R. N. Taylor, B. Taylor, K. Fujioka, 1991. "Pliocene-Quaternary Submarine Pumice Deposits in the Sumisu Rift Area, Izu-Bonin Arc", Sedimentation in Volcanic Settings, Richard V. Fisher, Gary A. Smith
Download citation file:
Thick, multiple deposits of Pliocene-Quaternary pumice are the dominant products of central Izu-Bonin Arc volcanism, both prior to and during rifting of the backarc Sumisu Basin. Pliocene pre-extension pulses of magmatism within the arc are recorded by crude coarsening-upward volcaniclastic sequences, and Quaternary synextension volcanism produced thick pumice units separated by intervals of hemipelagic sediment. In particular, the period from about 0.2 Ma to the present may have experienced four major episodes of pumice production and deposition with a periodicity averaging 30,000 years. The pumice was delivered to the basin by a combination of direct deposition of fallout from submarine (and possibly also subaerial) eruptions after settling through the water column, resedimentation from basin slopes by submarine debris flows, and redistribution on the basin floor by bottom currents.
Figures & Tables
Sedimentation in Volcanic Settings
We have gained considerable experience with volcaniclastic materials over the past 30 years, but the field has undergone considerable growth in the decade following the 1980 eruption of Mount St. Helens. This eruption resulted in an accelerated research in explosive volcanic products and spurred a renewed interest in volcaniclastic materials as they relate to plate tectonic boundaries and explosive volcanism in general. Since the early 1970s a loosely defined field called â∈œsedimentary tectonicsâ∈ has emerged. A large part of the field of sedimentation and tectonics includes studies of volcaniclastic sedimentation, largely because of the direct association of tectonism, volcanism and sedimentation. This book attempts to illuminate the field and to present its salient features to sedimentologists not generally versed in volcaniclastic particles, deposits or facies.