Phosphates in pallasite meteorites as probes of mantle processes in small planetary bodies

Details Phosphates in pallasite meteorites as probes of mantle processes in small planetary bodies Phosphates in pallasite meteorites as probes of mantle processes in small planetary bodies

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.353..637d&link_type=abstract

Nature (ISSN 0028-0836), vol. 353, Oct. 17, 1991, p. 637-640. Research supported by NASA.

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12

Asteroids, Meteoritic Composition, Phosphates, Planetary Mantles, Stony-Iron Meteorites, Chemical Composition, Crystallization, Rare Earth Elements, Trace Elements

Scientific paper

Trace element analyses of the phosphates minerals in stony-iron pallasite meteorites are used here to investigate the magmatic history of the silicate portions of pallasites. In Eagle Station and seven other pallasites, the phosphates have relatively low concentrations of REEs and are strongly enriched in heavy relative to light REE. These patterns are consistent with formation of phosphate by subsolidus reactions between metal and silicate, in which phosphate inherits the REE pattern of olivine. In Springwater and Santa Rosalia, calcium-rich phosphates have higher concentrations of REE, are enriched in light relative to heavy REE, and have negative europium anomalies. These patterns are consistent with crystallization of phosphate from a europium-depleted chondritic liquid. This is unlikely to have happened near the base of the differentiating parent-body mantle; it suggests that some pallasites may come from regions of their parent bodies much nearer the surface than the core-mantle boundary.

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