Mathematics – Logic
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996m%26ps...31..419m&link_type=abstract
Meteoritics and Planetary Science, Vol. 31, p. 419-423 (1996)
Mathematics
Logic
8
Scientific paper
The Lueders iron meteorite with silicate inclusions was recovered as a single specimen of ˜35.4 kg in Shackelford County, Texas, in 1973 and recognized as a meteorite in 1993. Siderophile element concentrations indicate chemical classification as a low-Ni lAB iron meteorite closely related to Landes; like Landes, it has a Cu content ˜4σ above the main IAB-IIICD trend and therefore we also designate Lueders as an anomalous member of IAB. The metallic host is composed of equigranular kamacite but with a suggestion of octahedral structure and with a bandwidth of 1.4 mm, suggesting structural classification as a coarse octahedrite (Og). The meteorite contains ˜23 wt% of roughly millimeter to centimeter-sized angular silicate inclusions. Classification as a lAB is confirmed by O isotopic analysis of silicate inclusions. These inclusions contain an assemblage rich in silicates, troilite and graphite; lack certain minor phases (e.g., daubreelite); and have angular shapes. A variety of processes (e.g., fragmentation, partial melting, reduction) appear to have played a significant role in the formation of Lueders and all lAB iron meteorites. Petrologic and chemical differences confirm that Lueders is not paired with the widely distributed Odessa meteorite.
Benedix Gretchen K.
Ehlmann Arthur J.
Keil Klaus
McCoy Timothy James
Wasson John T.
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