Other
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..801l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 6, pp.801-816
Other
16
Scientific paper
We present experimental measurements of olivine/liquid distribution coefficients for Ni (K Ni ) in basaltic and simple synthetic melts over a temperature range of 1400° to 1070°C. Our results suggest that 1. (1) K Ni and activity coefficients for NiO in basaltic melts are strongly dependent on temperature (e.g., K Ni =wt. %NiO ol /wt. %NiO liq ranges from 5.9 at 1400° to 29 at 1100°C); 2. (2) at constant temperature K Ni is dependent upon melt composition and structure, but this dependence is small over the composition range of common basaltic magmas; 3. (3) K Ni can be used as a geothermometer to predict olivine crystallization temperatures of basaltic magmas to within ±50°C; 4. (4) K Ni is significantly greater than one at all natural magmatic temperatures, thus the presence of olivine as a cumulus phase during fractional crystallization or as a residual phase during partial melting has a significant effect on the content of Ni in the coexisting melt phase; 5. (5)K Ni does not vary significantly as a function of Ni content of the melt up to at least one mole percent (i.e., Henry's law behavior is obtained for olivine and melt solutions of Ni).
Leeman William P.
Lindstrom David J.
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