Nickel in komatiites

Cawthorn, R. Grant; McIver, James

doi:10.1038/266716a0

Cited by 8 publications

(1 citation statement)

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“…Eruption of some picritic and ultrabasic liq uids has been reported [Clarke, 1970;Viljoen and Viljoen, 1969], but there has been a real ization that ultrabasic and picritic magmas are generally too dense to erupt readily, either through the crust or through an existing magma chamber [Stolper and Walker, 1980;Sparks et al, 1980]. The mixing process whereby picritic mag ma enters a basaltic magma chamber involves the equilibrium, not fractional, crystallization of most of the excess olivine [Huppert and Sparks, 1980], thus greatly reducing the pre dicted nickel depletion, which has in any case ceased to be a major issue because the origi nal calculations were based on incorrect as sumptions [Cawthorn and Mclver, 1977;Clarke and O'Hara, 1979;Elthon and Ridley, 1979].…”

Section: The Post-1975 Reappraisalmentioning

confidence: 99%

MORB—A Mohole misbegotten?

O’Hara

1982

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Terrestrial basalts are generally saturated with two or more crystal species on eruption and display a limited range of major‐element composition in combination with wide variations in concentrations and ratios of those trace elements that are excluded from the common crystal phases during crystal‐liquid separation events [Jamieson and Clarke, 1970]. The multiply saturated character and major‐element compositions of erupted basalts are controlled by their separation from crystals at low pressure. This is the low‐pressure cotectic character recognized by Bowen [1928], emphasized by Yoder and Tilley [1962], and interpreted by O'Hara [1965], in the light of high‐pressure experimental studies, as evidence of the derivation of common basalts by extensive fractional crystallization of picritic primary magmas close to the earth's surface.

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