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

Garcia, Michael O. and Ito, Emi and Eiler, John M. (2008) Oxygen Isotope Evidence for Chemical Interaction of Kīlauea Historical Magmas with Basement Rocks. Journal of Petrology, 49 (4). pp. 757-769. ISSN 0022-3530.

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Kīlauea historical summit lavas have a wide range in matrix δ^(18)_OVSMOW values (4·9–5·6‰) with lower values in rocks erupted following a major summit collapse or eruptive hiatus. In contrast, δ^(18)O values for olivines in most of these lavas are nearly constant (5·1 ± 0·1‰). The disequilibrium between matrix and olivine δ^(18)O 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 Kīlauea basement rocks are the likely sources of the contamination, based on O, Pb and Sr isotope data. However, the extent of crustal contamination of Kīlauea 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. Kīlauea's heterogeneous source, which is well represented by the historical summit lavas, probably has magma δ^(18)O values within the normal mid-ocean ridge basalt mantle range (5·4–5·8‰) based on the new olivine δ^(18)O values.

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Additional Information:© 2007 Oxford University Press. Received January 30, 2007; accepted June 13, 2007; advanced access publication 19 July 2007. This paper is dedicated to David Green on the occasion of his 70th birthday. David has been an inspiration to all who study basaltic magmas.Thanks go to the many friends who have assisted with this study, including Sorena Sorensen for lending critical samples from the Smithsonian collection; Nancy Baker, Rachel Konishi, Joann Romano, Kate Bridges, Kristina Garcia and Joe Horrell for help in the field; Chad Shishido and Kelly Kolysko for sample preparation; to Rhea Workman for assistance with the laboratory work; and Reed McEwan and John Tacinnelli for matrix sample oxygen isotope analysis. Analytical work in the Caltech stable isotope laboratories was supported, in part, by NSF grant EAR-0337736 and a grant from the EAR Technician support program. Our thanks go to journal reviewers Amy Gaffney, J. M. Rhodes and Ilya Bindeman for their helpful comments. This paper is SOEST Contribution 7149, and was supported by NSF grants (EAR03-36874) to MG and (EAR-0345905) to JE.
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EAR Technician support programUNSPECIFIED
Subject Keywords:Hawaii; Kīlauea; basalt; oxygen isotopes; crustal contamination
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SOEST Contribution7149
Issue or Number:4
Record Number:CaltechAUTHORS:20130415-102510745
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37934
Deposited By: Jason Perez
Deposited On:15 Apr 2013 22:55
Last Modified:03 Oct 2019 04:52

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