Chondrite Models for the Composition of the Earth's Mantle and Core

Details Chondrite Models for the Composition of the Earth's Mantle and Core Chondrite Models for the Composition of the Earth's Mantle and Core

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rspsa.354.1481j&link_type=abstract

Philosophical Transactions: Mathematical, Physical and Engineering Sciences, Volume 354, Issue 1711, pp. 1481-1494

Physics

Scientific paper

The terrestrial planets of the inner Solar System are believed to be broadly chondritic in composition. Here I suggest that the lithophile element composition of the terrestrial mantle, as approximated by primitive lherzolites having high Al/Si ratios and low Mg/Si ratios, was established by nebular rather than indigenous processes. The implications of this model include: (i) the Mg/Si ratio of the upper mantle is an instrinsic property of the bulk Earth and does not reflect differentiation of a terrestrial magma ocean; (ii) the Moon probably did not form by a giant impact on to the Earth; (iii) refractory lithophile elements should be 2.5-3.0 chondrites in the bulk silicate Earth; and (iv) silicon is not a major constituent of the Earth's core.

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