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Concentration of chalcophile and siderophile elements in MORB sulphide droplets : new sulphide melt-silicate melt partition coefficients

Patten Clifford, Barnes Sarah-Jane et Mathez Edmond A.. (2011). Concentration of chalcophile and siderophile elements in MORB sulphide droplets : new sulphide melt-silicate melt partition coefficients. Mineralogical Magazine, 75, (3), p. 1607.

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Résumé

We have determined the concentrations of chalcophile and siderophile elements by LA-ICP-MS from sulphide droplets and fresh glass in contact with them from MORB pillow rims. MORBs play an important role in the understanding of mantle petrogenesis, providing information on chemical fractionation of elements in the mantle. However, chalcophile element behaviour is not completely understood, partly due to the lack of data for partition coefficients between sulphide and silicate melts. Some droplets present homogenous textures and others portions rich in monosulphide solid solution (Mss) and intermediate solid solution (Iss) indicating that they have undergone crystal fractionation. For homogenous droplets, concentrations of Ni and Cu are 10 to 1%; Co and Zn 1000 to 100 ppm; Se, Te, Ag and Pb 100 to 10 ppm; Cd, Sn, Pd, Bi and Pt 10 to 1 ppm; Au, Ru and Re 1 to 0.1 ppm. For some of these elements it was also possible to obtain data in fresh glass allowing the calculation of partition coefficients. These were calculated for Ni (745± 252), Cu (1219 ± 381), Co (42 ± 5.5), Zn (3.4 ± 0.9), Sn (10.4 ± 1.8) and Pb (55.6 ± 9.3). Values for Ni, Cu and Co are in agreement with literature [1], suggesting that values for Zn, Sn and Pb are realistic.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:75
Numéro:3
Pages:p. 1607
Version évaluée par les pairs:Oui
Date:2011
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Déposé le:02 juin 2016 18:54
Dernière modification:09 déc. 2016 14:25
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