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Tectonic Implications of the Composition of Volcanic ARC Magmas

Tectonic Implications of the Composition of Volcanic ARC Magmas Volcanic arc magmas can be defined tectonically as magmas erupting from volcanic edifices above subducting oceanic lithosphere. They form a coherent magma type, characterized compositionally by their enrichment in large ion lithophile (LlL) elements relative to high field strength (HFS) elements. In terms of process, the predominant view is that the vast majority of volcanic arc magmas originate by melting of the underlying mantle wedge, which contains a component of aqueous fluid and/or melt derived from the subducting plate. Recently, opinions have converged over the key aspects of the physical model for magma generation above subduction zones (Davies & Stevenson 1992), namely: that the mantle wedge experiences subduction-induced corner flow (e.g. Spiegelman & MacKenzie 1987); 2. that the subduction component reaches the fusible part of the mantle wedge by the three-stage process of (i) metasomatism of mantle lithosphere, fol­ lowed by (ii) aqueous fluid release due to breakdown of hydrous minerals at depth (e.g. Wyllie 1983, Tatsumi et al 1983) and (iii) aqueous fluid migra­ tion, followed by hydrous melt migration, to the site of melting; 0084-6597/95/0515-0251$05.00 251 PEARCE & PEATE 3. that slab-induced flow may be locally reversed beneath the arc itself, allowing mantle decompression to contribute http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Earth and Planetary Sciences Annual Reviews

Tectonic Implications of the Composition of Volcanic ARC Magmas

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References (39)

Publisher
Annual Reviews
Copyright
Copyright 1995 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
0084-6597
eISSN
1545-4495
DOI
10.1146/annurev.ea.23.050195.001343
Publisher site
See Article on Publisher Site

Abstract

Volcanic arc magmas can be defined tectonically as magmas erupting from volcanic edifices above subducting oceanic lithosphere. They form a coherent magma type, characterized compositionally by their enrichment in large ion lithophile (LlL) elements relative to high field strength (HFS) elements. In terms of process, the predominant view is that the vast majority of volcanic arc magmas originate by melting of the underlying mantle wedge, which contains a component of aqueous fluid and/or melt derived from the subducting plate. Recently, opinions have converged over the key aspects of the physical model for magma generation above subduction zones (Davies & Stevenson 1992), namely: that the mantle wedge experiences subduction-induced corner flow (e.g. Spiegelman & MacKenzie 1987); 2. that the subduction component reaches the fusible part of the mantle wedge by the three-stage process of (i) metasomatism of mantle lithosphere, fol­ lowed by (ii) aqueous fluid release due to breakdown of hydrous minerals at depth (e.g. Wyllie 1983, Tatsumi et al 1983) and (iii) aqueous fluid migra­ tion, followed by hydrous melt migration, to the site of melting; 0084-6597/95/0515-0251$05.00 251 PEARCE & PEATE 3. that slab-induced flow may be locally reversed beneath the arc itself, allowing mantle decompression to contribute

Journal

Annual Review of Earth and Planetary SciencesAnnual Reviews

Published: May 1, 1995

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