TRACE-ELEMENT PARTITIONING BETWEEN SILICATE MINERALS AND CARBONATITE AT 25 KBAR AND APPLICATION TO MANTLE METASOMATISM

被引:93
作者
GREEN, TH [1 ]
ADAM, J [1 ]
SIE, SH [1 ]
机构
[1] CSIRO,DIV EXPLORAT GEOSCI,N RYDE,NSW 2113,AUSTRALIA
关键词
D O I
10.1007/BF01164645
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Experiments at 25 kbar and 1000-degrees-C, on a model trace element-enriched carbonatite-peridotite mix, produced augite + pargasite +/- garnet +/- dolomite coexisting with a carbonatite melt. Proton microprobe analysis of the phases showed that key trace elements (Rb, Ba, Sr, Nb, Ta, Zr, Y and REE) all partitioned strongly into the melt (with the exception of Y, Ho and Lu in garnet), verifying that carbonatite is potentially a highly effective metasomatizing agent. The data also indicate that carbonatitic metasomatism will impart higher Ba//Rb, Ba/Nb, Nb/Ta, Sr/Ta, La/Ta, and lower Zr/Y, with little change to Sr/Nb, in affected mantle.
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页码:179 / 184
页数:6
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