New Geochemical Data for Some Poorly Characterized Lunar Meteorites

We have obtained compositional data by INAA for several poorly characterized lunar-meteorite stones from hot deserts. Most are FLMs (feldspathic lunar meteorites). Our goal is to use compositional data to address whether any of the stones are paired with others that are better characterized. Dar al Gani 996. DaG 996 is a 12-g FLM stone. We analyzed 9 subsamples totaling 234 mg. Our sample had veins containing alteration products that led to en-U over their lunar concentrations. After correcting for contamination, our results for DaG 996 are all but indistinguishable from our previous results for two subsamples of much larger (513 g) DaG 262 [1]. Faces of sawn slabs of the two stones appear similar. Dar al Gani stones 262 and 996 are paired. Dhofar stones 280 and 910. We analyzed four sub-samples (total mass: 103 mg) of Dhofar FLM stone 280 (251 g), two from one location (L) of a slab an two from another location (R) separated by 12 mm. In slab view, the R subsamples appear to be from a dark, glassy clast; the L subsamples appear more typical of the slab. The R subsamples are somewhat more mafic (5.2% FeO) than the L subsamples (3.2% FeO) and have greater concentrations of IEs (incompatible elements; Fig. 1). There is textural and CRE evidence that Dhofar 081 (174 g) and 280 are paired [2,3]. The stones were also found close together in the field (Fig. 2). Our results for the L sub-samples (62 mg) of Dhofar 280 are sufficiently, but not ideally, similar to those of [4] for a larger subsample of Dhofar 081 (408 mg) that our results support pairing of Dhofar stones 081 and 280. Dhofar 280, at least, is clearly heterogeneous. We did not analyze a sufficient mass of Dhofar 280 material to unambiguously establish a compositional relationship between the stones. Dhofar 910 (142 g) was found in the vicinity of Dhofar 081 and 280 (as well as several other lunar meteorite stones; Fig. 2). Sawn faces of the three stones appear similar, e.g., all three stones are characterized by a high (~5%?) modal volume of vug space. We analyzed a total of five subsamples from two slabs of Dho-far 910 (total mass: 107 mg); results for all subsamples are similar. Dhofar 910 is less mafic (mean: 2.8 % FeO) and has lower concentrations of IEs (Fig. 1) than any lunar meteorite stone other than …