Sulfide-olivine Fe-Ni exchange and the origin of anomalously Ni-rich magmatic sulfides

摘要：

　　Equilibration between sulfide liquid and olivine is expressed in terms of the exchange coefficient for Fe and Ni,KD = (XFeS/XNiS)sulfide_liquid / (XFeO/XNiO)olivine.The positive dependence of KD on Ni+Cu content of sulfide liquid has been demonstrated experimentally,and gives rise to a critical non-linearity in the relationship between sulfide and olivine-saturated silicate liquid compositions.This effect has been modelled quantitatively,using an empirical best fit to available experimental data as a parameterisation of the KD variability.It is shown that it is a key factor in giving rise to extremely Ni-rich sulfides as exemplified by disseminated magmatic sulfide ores at Betheno (Western Australia) and Mirabela (Brazil).

作者: Stephen J.Barnes Bélinda Godel James M.Brenan

作者单位: CSIRO Earth Science and Resource Engineering,Kensington,Perth,Australia Department of Geology,University of Toronto,Canada

会议类型: 国际会议

会议名称: 第十二届镍矿床国际会议

会议地点: 贵阳

会议语种:英文

页码: 9-12

在线出版日期: 2012-06-16（万方平台首次上网日期，不代表论文的发表时间）