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TitleA procedure for calculating the equilibrium distribution of trace elements among the minerals of cumulate rocks, and the concentration of trace elements in the coexisting liquids
AuthorBédard, J H
SourceChemical Geology vol. 118, 1994 p. 143-153,
Alt SeriesGeological Survey of Canada, Contribution Series 15393
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
Subjectsgeochemistry; cumulus processes; whole rock analyses; trace element analyses; analyses; geochemical analyses; equilibrium; analytical methods
AbstractWhole-rock trace-element analyses can be used in conjunction with partition coefficients and mineral modes to calculate a liquidus-temperature equilibrium distribution of trace elements among the constituent minerals of cumulate rocks. Once the concentration of a trace element in a given mineral phase is known, then the trace-element concentration in the liquid that was in equilibrium with this mineral can be calculated if certain assumptions are made about the temperature and major-element chemistry of the liquid. The effects of a trapped melt fraction (TMF) are accounted for by: (1) including in the calculation a phase (the trapped melt) with a mineral/melt partition coefficient of 1; and (2) adjusting the rock's mode to reflect removal of the TMF. The method yields results comparable to those given by mineral separation or in situ analysis for trace elements.

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