Similar V/Sc Systematics in MORB and Arc Basalts: Implications for the Oxygen Fugacities of their Mantle Source Regions

doi:10.1093/petrology/egi056

Journal of Petrology Advance Access published online on June 13, 2005
Journal of Petrology, doi:10.1093/petrology/egi056

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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received July 15, 2004
Accepted May 3, 2005

Article

Similar V/Sc Systematics in MORB and Arc Basalts: Implications for the Oxygen Fugacities of their Mantle Source Regions

CIN-TY AEOLUS LEE ¹^*, WILLIAM P. LEEMAN ¹, DANTE CANIL ², and ZHENG-XUE A. LI ¹

¹ DEPARTMENT OF EARTH SCIENCES, MS-126, RICE UNIVERSITY, 6100 MAIN STREET, HOUSTON, TX 77005, USA
² SCHOOL OF EARTH AND OCEAN SCIENCES, UNIVERSITY OF VICTORIA, PETCH BUILDING, ROOM 280, 3800 FINNERTY ROAD, VICTORIA, BC, CANADA V8W 3P6

^* To whom correspondence should be addressed.
CIN-TY AEOLUS LEE, E-mail: ctlee{at}rice.edu

Abstract

V/Sc systematics in peridotites, mid-ocean ridge basalts andarc basalts are investigated to constrain the variation of fO₂in the asthenospheric mantle. V/Sc ratios are used here to ‘seethrough’ those processes that can modify barometric fO₂determinations in mantle rocks and/or magmas: early fractionalcrystallization, degassing, crustal assimilation and mantlemetasomatism. Melting models are combined here with a literaturedatabase on peridotites, arc lavas and mid-ocean ridge basalts,along with new, more precise data on peridotites and selectedarc lavas. V/Sc ratios in primitive arc lavas from the Cascadesmagmatic arc are correlated with fluid-mobile elements (e.g.Ba and K), indicating that fluids may subtly influence fO₂ duringmelting. However, for the most part, the average V/Sc-inferredfO₂s of arc basalts, MORB and peridotites are remarkably similar(-1·25 to +0·5 log units from the FMQ buffer) anddisagree with the observation that the barometric fO₂s of arclavas are several orders of magnitude higher. These observationssuggest that the upper part of the Earth's mantle may be stronglybuffered in terms of fO₂. The higher barometric fO₂s of arclavas and some arc-related xenoliths may be due respectivelyto magmatic differentiation processes and to exposure to large,time-integrated fluid fluxes incurred during the long-term stabilityof the lithospheric mantle.

Keywords: vanadium; scandium; oxygen fugacity; mantle; arcs.

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