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Partitioning of trace elements between garnet, clinopyroxene and diamond-forming carbonate-silicate melt at 7 GPa

Published online by Cambridge University Press:  05 July 2018

A. V. Kuzyura ,
F. Wall ,
T. Jeffries  and
Yu. A. Litvin
A. V. Kuzyura*
Affiliation:
Institute of Experimental Mineralogy RAS, 142432, Institutskaya Str., 4, Chernogolovka, Moscow region, Russia
F. Wall
Affiliation:
Camborne School of Mines, University of Exeter, Cornwall Campus, Truro, Cornwall TR10 9EZ, UK
T. Jeffries
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Yu. A. Litvin
Affiliation:
Institute of Experimental Mineralogy RAS, 142432, Institutskaya Str., 4, Chernogolovka, Moscow region, Russia
*
*E-mail: [email protected]
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Abstract

Concentrations of trace elements in coexisting garnet, clinopyroxene and completely miscible carbonate-silicate melt (formed at 7 GPa from the Chagatai silicocarbonatite rock known to be diamondiferous) were determined using LA-ICP-MS. The partition coefficients for Li, Rb, Cs, Ba, Th, U, Ta, Nb, La, Ce, Pb, Pr, Sr, Nd, Zr, Hf, Sm, Eu, Gd, Tb, Dy, Y, Ho, Er, Tm, Yb, Lu, Sc and Zn were determined. The new experimental data for trace-element partitioning between garnet, clinopyroxene and carbonate-silicate melt have been compared with published data for partitioning between garnet, clinopyroxene and carbonatite melt, and garnet, clinopyroxene and silicate melt. The results show that the trace-element partitioning is not significantly altered by changes in melt composition, with HREE always concentrated in the garnet. Carbonate-silicate melt, as a diamond-forming medium, and carbonatite or silicate melt equilibrated with mantle silicate minerals, behave similarly in respect of trace-element distribution.

Keywords

trace elementspartition coefficientcarbonate-silicate meltgarnetclinopyroxenediamond-forming medium
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 2 , April 2010 , pp. 227 - 239
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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