Rare earth element carriers in the Shergotty meteorite and implications for its chronology

Details Rare earth element carriers in the Shergotty meteorite and implications for its chronology Rare earth element carriers in the Shergotty meteorite and implications for its chronology

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2147l&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, Aug. 1988, p. 2147-2163.

Mathematics

Logic

19

Abundance, Interstitials, Meteorites, Rare Earth Elements, Chronology, Petrology, Phosphates, Pyroxenes, Uranium

Scientific paper

This paper reports on the results of ion-probe measurements of REE concentrations in individual grains of the Shergotty meteorite. The phases analyzed included whitlockite, apatite, baddeleyite, augite, pigeonite, maskelynite, and K-rich glass; the whitlockite and apatite phases were also analyzed for U. Results indicate that whitlockite contains the bulk of the REE in Shergotty, with no evidence for distinct light-REE patterns in texturally different whitlockites. The results on the evolution of the REE abundances in the Shergotty late-stage interstitial melt, inferred from the analysis of whitlockite, are consistent with closed system crystallization. No metasomatic alteration is required to explain the REE data. It is concluded that there is no compelling reason to attribute chronological significance to the Sm-Nd array, as was done by Jagoutz and Waenke (1986).

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