Ni partitioning between diopside and silicate melt: A redetermination by ion microprobe and recognition of an experimental complication

Details Ni partitioning between diopside and silicate melt: A redetermination by ion microprobe and recognition of an experimental complication Ni partitioning between diopside and silicate melt: A redetermination by ion microprobe and recognition of an experimental complication

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.2177s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 11, pp.2177-2183

Computer Science

1

Scientific paper

The ion probe is uniquely suited for measurement of element partitioning between phases in experimental and natural systems. A redetermination of the partitioning of Ni between diopside and quenched silicate melt using samples previously measured by -track mapping gives 1.87 (weight ratio of 62 Ni in diopside/melt), slightly lower than the -track value of 2.05. Critical to the accurate determination of distribution coefficients are: (1) a secondary ion signal that is linear with concentration in the range measured, and (2) a calibration using known concentrations to correct for differential secondary ion yields from different phases. In the present case the secondary ion signal is linear with Ni concentrations below ~ 1 wt% in both diopside and glass, but nonlinear above. Differential yields were corrected by calibrating the secondary ion signal against compositions determined by electron microprobe. Partition coefficients measured using 58 Ni and 60 Ni, in contrast to 62 Ni, are not constant with concentration in these samples probably due to Ni migration during crystallization. Measurements using these isotopes (or bulk Ni) show a change of partition coefficient with Ni concentration.

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