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The effect of Cr 2 O 3 on the partial melting of spinel lherzolite in the system CaO-MgO-Al 2 O 3 -SiO 2 -Cr 2 O 3 at 1.1 GPa

Liu, Xi; O'Neill, Hugh

Description

Chromium as Cr3+ substitutes for octahedrally coordinated Al in upper-mantle minerals, thereby reducing the activity of Al 2O3 in the system and hence the concentration of Al2O3 in partial melts. The effect of Cr2O3 on melt compositions multiply saturated with the spinel lherzolite phase assemblage has been quantified in the system CaO-MgO-Al2O3-SiO 2-Cr2O3 at 1·1 GPa as a function of 100 Cr/(Cr + Al) in the spinel (Cr#sp). The decrease of Al2O3 in the melt with increasing Cr# sp is accompanied...[Show more]

CollectionsANU Research Publications
Date published: 2004
Type: Journal article
URI: http://hdl.handle.net/1885/88254
Source: Journal of Petrology
DOI: 10.1093/petrology/egh055

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