Clinopyroxene REE distribution coefficients for shergottites The REE content of the Shergotty melt

Details Clinopyroxene REE distribution coefficients for shergottites The REE content of the Shergotty melt Clinopyroxene REE distribution coefficients for shergottites The REE content of the Shergotty melt

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..927m&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Physics

62

Achondrites, Distribution (Property), Melts (Crystal Growth), Meteoritic Composition, Pyroxenes, Rare Earth Elements, Crystal Structure, Evolution (Development), Mineralogy, Meteorites, Stony Meteorites, Achondrites, Shergotty, Samples, Meteorite, Clinopyroxene, Rare Earth Elements, Distribution, Shergottites, Melts, Mineralogy, Abundance, Calculations, Depletion, Melting, Formation, Origin, Procedure, Laboratory Studies, Crystals, Morphology, Pyroxene, Zoning, Equlibration, Microprobe Methods, Composition

Scientific paper

REE abundances were computed for the Shergotty intercumulus melt using distribution coefficients measured for the natural phase compositions. These computed abundances display LREE depletion. Such LREE-depleted abundance patterns cannot be generated by simple partial melting of a mafic mineral assemblage having the LREE-enriched patterns required for a two-stage Sm-Nd evolution history. This result implies that either (1) the melting process was complex (e.g., continuous melting), (2) the source region had a more complex history than that of the simple 2-stage model, or (3) Shergotty does not satisfy the closed-system assumption of the calculation, and has suffered post-magmatic LREE-enrichment.

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