Experimental partitioning of uranium between liquid iron sulfide and liquid silicate: Implications for radioactivity in the Earth's core

Publication Type  Journal Article
Year of Publication  2006
Authors  Wheeler, K. T.; Walker, D.; Fei, Y. W.; Minarik, W. G.; McDonough, W. F.
Journal Title  Geochimica Et Cosmochimica Acta
Volume  70
Issue  6
Pages  1537-1547
Journal Date  Mar 15
ISBN Number  0016-7037
Accession Number  ISI:000236252800014
Key Words  fe-ni-s; siderophile elements; planetary cores; constraints; potassium; pressure; temperature; peridotites; meteorites; interior

Measurable uranium (U) is found in metal sulfide liquids in equilibrium with molten silicate at conditions appropriate for a planetary magma ocean: 1-10 GPa, 1750-2100 degrees C, 0-28 wt% S, and fO(2) 2 log units below IW. However, the transfer of U from metal sulfide to silicate under our experimental conditions is so complete that insufficient U would remain so as to be of any importance to the core's heat budget. U content in the Sulfide phase increases strongly with S content but shows no significant variability with either pressure or temperature. Maximum D-U(sulfide/silicate) is 0.001 while most values are considerably lower. 2006 Elsevier Inc. All rights reserved.


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URL  <Go to ISI>://000236252800014
DOI  DOI 10.1016/j.gca.2005.11.023