Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.494m&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 494
Computer Science
Breccia, Carbonaceous Chondrites, Chemical Composition, Inclusions, Meteoritic Composition, Electron Probes, Ion Probes, Isotopes, Rare Earth Elements
Scientific paper
Kaidun is a unique CR-like chondritic breccia that encloses CI, CM, and E chondrite, and E achondrite clasts. Like CR chondrites, Kaidun contains only rare small Ca-Al rich inclusions (CAIs) that resemble ones in CO3 chondrites. One example, #53.08, is a 300 x 550 micron-sized oblong object consisting of two dissimilar halves. At one end is a compact intergrowth of aluminous melilite and sparse inclusions of spinel. The opposite end of the inclusion is melilite-free, containing instead an unknown Ca-Ti-Al-rich silicate, possibly an unusual pyroxene, that differs in composition both from 'UNK'. Calculated as pyroxene, the stoichiometry suggests that approximately 65% of the Ti is present as Ti(3+). The pyroxene-like phase encloses very abundant spinel and rare hibonite grains. Mantling the melilite-free end is a porous region consisting mostly of spinel. A discontinuous Wark-Lovering-type rim sequence occurs only on the melilite-rich end of 53.08 and consists of spinel and aluminous diopside layers. Different from either of these is #53.07, an approximately 74-micron spheroidal object having a core of spinel, an intermediate zone of diopside, and an outer mantle of spinel, giving the whole a 'bulls-eye'-like aspect. Rare earth elements in 53.08 are mostly unfractionated at approximately 20-30x CI. Melilite has a flat pattern at 10-20x CI with a slight positive Eu anomaly. Such a pattern differs from the Light Rare Earth Elements (LREE)-enriched patterns commonly observed in melt-derived melilites, suggesting that 53.08 did not solidify from a melt. The pyroxene-like silicate has a Heavy Rare Earth Elements (HREE)-enriched pattern that resembles REE patterns seen in pyroxenes from type A inclusions. Rare Earth Elements (REE) in 3.10h are essentially flat at approximately 10-20x CI, with no Eu anomaly but a slight negative Yb anomaly.
Davis Aileen M.
Ivanov Anatoly A.
MacPherson Glenn J.
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