Siderophile and Chalcophile Elements Distribution in MORB Sulphide Droplets:Determination of New Sulphide Melt-Silicate Melt Partition Coefficients and Early Sulphide Crystallisation History
The distribution of the Highly Siderophile Elements (Pt,Pd,Rh,Ru,Ir,Os,Re and Au) among base-metal sulphide,oxide and silicate minerals has received a great deal of attention due to both their importance in understanding petrogenetic processes and their economic value.In contrast the behaviour of many minor and trace chalcophile elements has received less attention.Using Laser Ablation-Induced Coupled Plasma-Mass Spectrometer (LA-ICP-MS) on sulphide droplets in fresh Mid-Ocean-Ridge Basalts (MORB) glass allows us to calculate new partition coefficients for chalcophile elements.We have calculated partition coefficients for Co (45±4.1),Ni (776±91),Cu (1334±194),Zn (3.5±0.79),Se (323±41.7),Ag (1138±219),Cd (107±43),Sn (10.8±1.45),Te (4791±1195),Pb (57±9) and Bi (487±84).With these values it is possible to estimate the contribution of sulphides to the bulk partition coefficient during mantle melting.Except for Cu and Te,the chalcophile elements behave as incompatible during mantle melting.Sulphides fractionate these elements from each other and from lithophiles.
C.Patten S.-J.Barnes E.A.Mathez
Sciences de la Terre,Université du Québec à Chicoutimi,QC,Canada Department of Earth and Planetary Sciences,American Museum of Natural History,New York,USA
国际会议
贵阳
英文
22-25
2012-06-16（万方平台首次上网日期，不代表论文的发表时间）