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Oxygen-isotope evidence for altered oceanic crust in the Atlantic MORB source

Cooper, Kari M. and Eiler, John M. and Asimow, Paul D. (2002) Oxygen-isotope evidence for altered oceanic crust in the Atlantic MORB source. Geochimica et Cosmochimica Acta, 66 (15A). A151-A151. ISSN 0016-7037.

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A long-wavelength geochemical gradient in Mid-Atlantic Ridge (MAR) samples collected between 33 and 41°N has previously been attributed to mixing of material from depleted and enriched (EMII-type) mantle components. Enriched mantle domains are principally identified using isotopes of incompatible trace elements, which can be dominated by small mass fractions of enriched material. Oxygen, by contrast, occurs in roughly constant abundance in most mantle and crustal minerals and deviations from mantle δ^(18)O reflect near-surface processes; thus variations in δ^(18)O can be used to constrain the percentage of recycled near-surface materials within a given source region. We present here high-precision oxygen-isotope analyses of MAR glasses and discuss the implications for the nature and percentage of the regional enriched component.

Item Type:Article
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Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2002 Pergamon-Elsevier Science Ltd.
Issue or Number:15A
Record Number:CaltechAUTHORS:20120906-092507177
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33897
Deposited By: Tony Diaz
Deposited On:07 Sep 2012 16:48
Last Modified:03 Oct 2019 04:14

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