Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..479k&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 479-480
Other
Carbonaceous Chondrites, Chemical Composition, India, Meteoritic Composition, Abundance, Rare Earth Elements, Volatility, Weathering
Scientific paper
Mason and Wiik described the Kakangari meteorite, which fell in India in 1890, as probably a carbonaceous chondrite. Although it has affinities to carbonaceous (and ordinary) chondrite groups, it also has distinct differences that have led researchers to conclude that Kakangari belongs to its own grouplet. Recently, two other chondrites, Lea County 002 and LEW 87232, were proposed as members of the same grouplet. We have analyzed replicate samples of Kakangari and LEW 87232 by instrumental neutron activation analysis, and reported our preliminary data. Chlorine- and Mg-normalized lithophile-element abundances in Kakangari are indistinguishable from mean H and L chondrite values for those elements. Refractory and common siderophile element abundances in Kakangari are intermediate to mean H and L chondrite values. Moderately volatile siderophile-element abundances are generally slightly higher than those in mean H and L chondrites. The biggest compositional difference with the H and L chondrites is among the chalcophile-element abundances, where Kakangari values were more than twice those of mean H and L chondrite values. This is consistent with the previously noted higher abundance of S in Kakangari relative to ordinary chondrites. The Antarctic meteorite, LEW 87232 is a small and very weathered (type B) meteorite, and its bulk compositional analysis bears this out. Its lithophile-element abundance pattern is highly fractionated, with sharp depletions in Ca, REE, V, Cr, and K relative. Despite the fractionated abundance pattern of LEW 87232, the compositional data would seem to support the inclusion of LEW 87232 in the Kakangari grouplet. The key refractory lithophile-element abundances, Al and Sc, are identical to Kakangari. Large deviations in abundances relative to Kakangari are depletions that are probably the result of weathering effects.
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