A Caltech Library Service

^(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.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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)
Related URLs:
URLURL TypeDescription Website
Tissot, F. L. H.0000-0001-6622-2907
Dauphas, N.0000-0002-1330-2038
Additional Information:© 2016 Lunar and Planetary Institute.
Record Number:CaltechAUTHORS:20180618-110140466
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87190
Deposited By: Tony Diaz
Deposited On:18 Jun 2018 20:35
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page