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Review Article: Recent Marine Geological Research in the Mariana and Izu-Bonin Island Arcs

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Title:Review Article: Recent Marine Geological Research in the Mariana and Izu-Bonin Island Arcs
Authors:Fryer, Patricia
Date Issued:Apr 1990
Publisher:University of Hawaii Press
Citation:Fryer P. 1990. Review article: recent marine geological research in the mariana and Izu-Bonin Island arcs. Pac Sci 44(2): 95-114.
Abstract:Over the last decade models of the structure, composition, and
evolutionary processes of the Mariana and lzu-Bonin island arc systems of the
western Pacific have been changed profoundly by an interdisciplinary and multinational
approach to studying the details of these regions. The standard marine
geological studies have been superseded by detailed sea-floor mapping, sea-floor
observations using submersibles, and deep-ocean drilling efforts. The increased
level of effort is the result of discoveries of new geological phenomena in these
regions and the desire to approach the study of ancient convergent margin
terrains exposed on land in the light of the resultant insights. The new discoveries
include active eruption of serpentine muds forming large volcano-like seamounts
in the Mariana forearc, recent protrusion of serpentinite debris flows from faultdissected
horsts of metamorphosed supra-subduction zone mantle also in the
Mariana forearc, similar ancient seamounts in the Izu-Bonin forearc region,
evidence of recent forearc rifting, petrogenetically complex arc volcanoes situated
within the backarc basin setting in both the Mariana and lzu-Bonin systems, the
occurrence in close proximity to one another of magmas generated from different
sources (the deep arc source and the shallower backarc basin basalt source) in
neovolcanic zones of the incipient rifting portions of the Mariana and Izu-Bonin
backarc rifts, and a variety of unique hydrothermal systems and fauna associated
both with the arc volcanoes and with the active backarc spreading centers.
Appears in Collections: Pacific Science Volume 44, Number 2, 1990

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