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^(238)U/^(235)U Ratio in Carbonates as a Global Paleoredox Proxy

Chen, C. and Tissot, F. L. H. and Dauphas, N. and Bekker, A. and Halverson, G. P. and Veizer, J. and Go, B. M. and Naziemiec, M. and Shaw, L. and Healy, G. (2016) ^(238)U/^(235)U Ratio in Carbonates as a Global Paleoredox Proxy. In: 47th Lunar and Planetary Science Conference, March 21-25, 2016, The Woodlands, TX. http://resolver.caltech.edu/CaltechAUTHORS:20180618-110140466

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Abstract

Uranium has two main oxidation states: 4+ and 6+. In the modern ocean, U is present in its most oxidized, highly soluble form, U^(6+) [1]. In the Archean, however, when the oxygen concentration in the atmosphere was low, U was likely present in its reduced 4+ state, which has low solubility. This contrast in solubility behavior depending on the redox conditions makes U a very useful proxy of the global oxygenation state of the Earth. Indeed, one of the most important indicators that the pO_2 was low in the Archean is the survival of detrital uraninite [2], which is unstable under the modern oxic conditions.


Item Type:Conference or Workshop Item (Paper)
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https://www.hou.usra.edu/meetings/lpsc2016OrganizationConference Website
ORCID:
AuthorORCID
Tissot, F. L. H.0000-0001-6622-2907
Additional Information:© 2016 Lunar and Planetary Institute.
Record Number:CaltechAUTHORS:20180618-110140466
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180618-110140466
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87190
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Jun 2018 20:35
Last Modified:18 Jun 2018 20:35

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