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^(17)O anomalies in sedimentary silica and oxides

Levin, N. E. and Raub, T. D. and Dauphas, N. and Eiler, J. M. (2010) ^(17)O anomalies in sedimentary silica and oxides. Geochimica et Cosmochimica Acta, 74 (12). A585. ISSN 0016-7037. doi:10.1016/j.gca.2010.04.037.

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Recent oxygen isotope measurements demonstrate small but significant deviations from a single mass dependent fractionation line among terrestrial materials [1, 2]. These anomalies confirm theoretical expectations of variation in the δ^(17)-δ^(18) relationship for equilibrium and kinetic isotope fractionations such that kinetic processes result in a relatively shallow slope (0.513) and equilibrium procesess result in a steeper slope (0.529) [3]. Here we present Δ^(17)O data for sedimentary silica and oxides, including cherts and banded iron formation (BIF) materials. We report Δ^(17)O relative to a reference line (δ^(17)O-δ^(18)O), slope 0.530 ± 0.003 (95% conf, MSWD = 1.07 [4]), that we produced from analysis of igneous and high-grade meta-igneous garnet, albite, pyroxene, olivine and quartz. This slope is higher than slopes previously generated for garnets (0.527 ± 0.001) and quartz (0.524 ± 0.001) in other laboratories [2], but within error of the slope predicted for equilibrium fractionation (0.529).

Item Type:Article
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URLURL TypeDescription
Raub, T. D.0000-0002-7471-0246
Dauphas, N.0000-0002-1330-2038
Additional Information:© 2010 Published by Elsevier Ltd.
Issue or Number:12
Record Number:CaltechAUTHORS:20130731-094940963
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Official Citation:Goldschmidt Abstracts 2010 – L, Geochimica et Cosmochimica Acta, Volume 74, Issue 12, Supplement, June 2010, Pages A553-A648, ISSN 0016-7037,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39671
Deposited By: Tony Diaz
Deposited On:06 Aug 2013 18:37
Last Modified:09 Nov 2021 23:46

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