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Amphibole “sponge” in arc crust?

Davidson, J.; Turner, S.; Handley, H.; Macpherson, C.; Dosseto, A.

Authors

J. Davidson

S. Turner

H. Handley

A. Dosseto



Abstract

Pressure-temperature-time paths followed by arc magmas ascending through the lithosphere dictate the phase assemblage that crystallizes, and hence the compositions of liquid fractionates. Here we use La/Yb and Dy/Yb versus SiO2 relationships from selected volcanoes to show that amphibole is an important mineral during differentiation of arc magma. Production of intermediate and silicic arc magmas occurs as magmas stall and cool in the mid-lower crust, where amphibole is stable. Because amphibole is rarely a phenocryst phase, we term this “cryptic amphibole fractionation.” If this process is as widespread as our investigation suggests, then (1) amphibole cumulates may act as an effective filter for water dissolved in mantle-derived magmas; (2) amphibole cumulates may act as a fertile source of intracrustal melts and fluids; and (3) recycling of amphibole cumulates has the potential to return incompatible trace elements and water to the mantle.

Citation

Davidson, J., Turner, S., Handley, H., Macpherson, C., & Dosseto, A. (2007). Amphibole “sponge” in arc crust?. Geology, 35(9), 787-790. https://doi.org/10.1130/g23637a.1

Journal Article Type Article
Acceptance Date Apr 26, 2007
Publication Date Sep 1, 2007
Deposit Date Mar 12, 2009
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 35
Issue 9
Pages 787-790
DOI https://doi.org/10.1130/g23637a.1
Keywords amphibole, recycling, crustal origin, rare earth elements, magma, basalt, fractionation, arcs