TY - JOUR
T1 - Iron isotope fractionation and the oxygen fugacity of the mantle
AU - Williams, Helen M.
AU - McCammon, Catherine A.
AU - Peslier, Anne H.
AU - Halliday, Alex N.
AU - Teutsch, Nadya
AU - Levasseur, Sylvain
AU - Burg, Jean Pierre
PY - 2004/6/11
Y1 - 2004/6/11
N2 - The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe3+Fe2+ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ57/54Fe) of mantle spinels. Spinel δ57/54Fe values correlate with relative oxygen fugacity, Fe3+/σFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.
AB - The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe3+Fe2+ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ57/54Fe) of mantle spinels. Spinel δ57/54Fe values correlate with relative oxygen fugacity, Fe3+/σFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.
UR - http://www.scopus.com/inward/record.url?scp=2942638279&partnerID=8YFLogxK
U2 - 10.1126/science.1095679
DO - 10.1126/science.1095679
M3 - Article
AN - SCOPUS:2942638279
SN - 0036-8075
VL - 304
SP - 1656
EP - 1659
JO - Science
JF - Science
IS - 5677
ER -