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Insights into the origin of low-δ^(18)O basaltic magmas in Hawaii revealed from in situ measurements of oxygen isotope compositions of olivines

Wang, Zhengrong and Eiler, John M. (2008) Insights into the origin of low-δ^(18)O basaltic magmas in Hawaii revealed from in situ measurements of oxygen isotope compositions of olivines. Earth and Planetary Science Letters, 269 (3-4). pp. 377-387. ISSN 0012-821X. doi:10.1016/j.epsl.2008.02.018.

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In situ measurements of oxygen isotope and elemental compositions of olivines from subaerial Mauna Kea lavas reveal that their δ^(18)O values correlate positively with their forsterite contents, consistent with addition of one or more low-δ^(18)O components into magmas from which they grew over the course of their crystallization–differentiation histories. This result supports previous suggestions that low-δ^(18)O components to Mauna Kea lavas are contaminants derived from hydrothermally-altered rocks in the volcanic edifice or lithosphere, rather than components of the underlying mantle sources of these lavas. The slope of the correlation between δ^(18)O values and forsterite contents of olivines is steeper for subaerial Mauna Kea lavas than for submarine Mauna Kea lavas, and olivines from Mauna Loa lavas exhibit negligible changes in δ^(18)O values over a similar range of forsterite contents. Models of assimilation–fractional crystallization (AFC) processes can explain our observations if the δ^(18)O values of crustal contaminants decrease sharply at the submarine–subaerial transition in Mauna Kea volcano, and if Mauna Loa lavas are either uncontaminated or contaminated only by rocks that have δ^(18)O values similar to that of primary Mauna Loa magmas. We suggest that the differences in oxygen isotope systematics among Mauna Loa, submarine Mauna Kea and subaerial Mauna Kea lavas principally reflect the sources and amounts of water available to hydrothermal systems in the volcanic edifice.

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Wang, Zhengrong0000-0003-3149-0236
Additional Information:© 2008 Elsevier B.V. Received 26 December 2006; received in revised form 25 January 2008; accepted 1 February 2008. Available online 4 March 2008. Edited by: R.W. Carlson. We thank Chi Ma for helps with SEM and EMP analysis in the Caltech GPS analytical facility, George Rossman for discussions and providing gem-quality San Carlos olivine standard, Paul Asimow for teaching the first author to use the MELTS program, and H.P. Taylor and K. Muehlenbachs for providing valuable comments. This paper is also greatly benefited from comments and suggestions from Dr. Danny Rye, Richard Carlson, and 2 anonymous reviewers. The principle financial support for this research was a grant from the Margins program at NSF.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Subject Keywords:Hawaiian lava; in situ oxygen isotope measurement; olivine; AFC process
Issue or Number:3-4
Record Number:CaltechAUTHORS:20121119-111733309
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Official Citation:Zhengrong Wang, John M. Eiler, Insights into the origin of low-δ18O basaltic magmas in Hawaii revealed from in situ measurements of oxygen isotope compositions of olivines, Earth and Planetary Science Letters, Volume 269, Issues 3–4, 30 May 2008, Pages 377-387, ISSN 0012-821X, 10.1016/j.epsl.2008.02.018. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35542
Deposited By: Ruth Sustaita
Deposited On:19 Nov 2012 19:30
Last Modified:09 Nov 2021 23:16

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