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Magmatic origin of low-Ca olivine in subduction-related magmas: Co-existence of contrasting magmas

Citation

Kamenetsky, VS and Elburg, M and Arculus, R and Thomas, R, Magmatic origin of low-Ca olivine in subduction-related magmas: Co-existence of contrasting magmas, Chemical Geology, 233, (3-4) pp. 346-357. ISSN 0009-2541 (2006) [Refereed Article]

DOI: doi:10.1016/j.chemgeo.2006.03.010

Abstract

Unravelling the origin of different components contributing to subduction-related magmas is a prerequisite to understanding the sources and processes involved in their origins. Mafic, high-Ca subduction-related magmas from geographically-diverse areas (Indonesia, Solomon Islands, Kamchatka, Valu Fa Ridge) contain two populations of olivine crystals, of which only the high-Ca population (CaO = 0.3-0.5 wt.%) crystallized from the melt that dominantly contributed to the whole rock composition. Forsterite-rich (Fo 90-94), low-Ca (CaO < 0.15 wt.%), high-Ni (NiO > 0.3 wt.%) olivine crystals, which constitute 16-37 vol.% of total olivine population, are generally interpreted as mantle or lithospheric xenocrysts. However, in these samples, the olivine shape and chemical zoning, the composition of included minerals (orthopyroxene, clinoenstatite and Cr-spinel) and presence of melt inclusions, are indications that these crystals are phenocrysts from a mafic magma with high silica and low calcium contents. The coexistence of contrasting magmas (mafic high-Ca silica-poor versus low-Ca silica-rich) within a number of arc systems and their mixing may not be a rare event, and should be taken into account when developing models of arc petrogenesis. © 2006 Elsevier B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:43359
Year Published:2006
Web of Science® Times Cited:48
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2006-08-01
Last Modified:2007-05-02
Downloads:0

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