Mass balance and phase density constraints on early differentiation of chondritic mantle

Details Mass balance and phase density constraints on early differentiation of chondritic mantle Mass balance and phase density constraints on early differentiation of chondritic mantle

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..90..144a&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 90, no. 2, Oct. 1988, p. 144-156. NSF-supported research.

Computer Science

79

Chondrites, Earth Mantle, Mass Balance, High Pressure, Magma, Olivine, Perovskites, Trace Elements

Scientific paper

A simple and precise major element mass balance is shown to be consistent with derivation of average upper mantle peridotite from a partially molten chondritic earth by subtraction of perovskite and addition of olivine. Majorite involvement is precluded. Perovskite subtraction during a primordial melting event is expected to occur by crystal fractionation at depth, while olivine addition is accomplished by a combination of buoyancy mechanisms. The processes of these mechanisms are consistent with the known density relations of crystals and liquid at very high pressure. Mass balance predicts that the residual magma body at depth after supplying olivine by flotation upward can be komatiitic.

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