Journal article

MANTLE AND SLAB CONTRIBUTIONS IN ARC MAGMAS

CJ HAWKESWORTH, K GALLAGHER, JM HERGT, F MCDERMOTT

ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES | ANNUAL REVIEWS INC | Published : 1993

Abstract

The current consensus is that most arc rocks crystallized from parental magmas generated in the mantle wedge, and that melting took place in the presence of water so that the temperature at the solidus was less than that beneath mid-ocean ridges and oceanic islands. The inference is that the water was released from the subducted oceanic crust, and that other more mobile elements were transported in the hydrous fluids, but the size and nature of the contribution from the subducted crust, and how it may be recognized, remain contentious. This review considers ways in which contributions from the subducted slab and the mantle wedge may be recognized, and examines estimated fluxes from subducted..

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