The Composition of a New R-Chondrite and the Classification of Chondritic Meteorites

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Chondrites, Chondrites: R, Elements: Moderately Volatile, Meteorites: Desert

Scientific paper

A dramatic increase in the number of recovered meteorites during the last ten years led to the discovery of new meteorite classes. The Rumuruti meteorites (R-chondrites) presently comprise 10 meteorites, with only one fall, Rumuruti. Meteorites of this new group are characterized by high olivine content with predominantly FeO-rich olivine (ca. Fa 39) and the almost complete absence of metallic iron. Yet the bulk composition of these oxidized objects is similar to ordinary chondrites. It is therefore not clear, how these meteorites fit into conventional classification schemes for chondritic meteorites. Here we report XRF and INAA data on a new R-chondrite, Dar al Gani 013, from the Libyan desert. In addition, we have performed XRF-analyses on two other R-chondrites, Rumuruti and Acfer 217. The results confirm that R-chondrites are a unique group of chondritic meteorites that cannot be derived from ordinary chondrites by oxidation.

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