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Journal of Petrology Advance Access published online on July 19, 2007
Journal of Petrology, doi:10.1093/petrology/egm034
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Oxygen Isotope Evidence for Chemical Interaction of Ki lauea Historical Magmas with Basement Rocks

Michael O. Garcia1,*, Emi Ito2 and John M. Eiler3

1Department of Geology & Geophysics, University of Hawai’i, Honolulu, HI 96822, USA
2Department of Geology & Geophysics, University of Minnesota, Minneapolis, MN 55455, USA
3Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA

Received January 30, 2007; Revised typescript accepted June 13, 2007


  Abstract

Kilauea historical summit lavas have a wide range in matrix {delta}18OVSMOW values (4·9–5·6{per thousand}) with lower values in rocks erupted following a major summit collapse or eruptive hiatus. In contrast, {delta}18O values for olivines in most of these lavas are nearly constant (5·1 ± 0·1{per thousand}). The disequilibrium between matrix and olivine {delta}18O values in many samples indicates that the lower matrix values were acquired by the magma after olivine growth, probably just before or during eruption. Both Mauna Loa and Kilauea basement rocks are the likely sources of the contamination, based on O, Pb and Sr isotope data. However, the extent of crustal contamination of Kilauea historical magmas is probably minor (< 12%, depending on the assumed contaminant) and it is superimposed on a longer-term, cyclic geochemical variation that reflects source heterogeneity. Kilauea's heterogeneous source, which is well represented by the historical summit lavas, probably has magma {delta}18O values within the normal mid-ocean ridge basalt mantle range (5·4–5·8{per thousand}) based on the new olivine {delta}18O values.

KEY WORDS: Hawaii; Kilauea; basalt; oxygen isotopes; crustal contamination

*Corresponding author. E-mail: morgarcia{at}hawaii.edu


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