Partitioning of nickel between immiscible picritic liquids

Details Partitioning of nickel between immiscible picritic liquids Partitioning of nickel between immiscible picritic liquids

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..339g&link_type=abstract

Earth and Planetary Science Letters, Volume 37, Issue 2, p. 339-346.

Computer Science

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Scientific paper

Proterozoic lavas from the Ventersdorp Supergroup in South Africa display liquid immiscibility textures with ocelli up to 15 cm in diameter. The magmas are of an unusual high-magnesia, but quartz-normative, composition. The high silica and high magnesia content may cause the liquid immiscibility, producing a ``pyroxene-type'' and ``tridymite-type'' structured liquid. Nickel contents are high (400-900 ppm), with the matrix containing up to 1.45 times that of the ocelli. A greater proportion of octahedral sites probably exists in the ``pyroxene-type'' liquid causing this preferential partitioning of Ni. The partition coefficients for Ni between olivine and these two liquid types are significantly different, emphasizing the importance of the structure of these liquids on such parameters.

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