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INTRODUCTION Ureilites are achondrites consisting of mafic silicates (olivines, pyroxenes) and minor interstitial material that is metal- and carbon-rich. The entire range of forsterite (Mg2SiO4) contents observed in the olivine cores is Fo74 to Fo97 among all ureilites, but there is a clear peak at the low end of the distribution with many samples clustering at Fo79-81 (Goodrich et al., 2015; Mittlefehldt et al., 1998, see also Downes et al., 2008).
Abstract We report a NanoSIMS search for presolar grains in the CM chondrites Asuka (A) 12169 and A12236. We found 90 presolar O‐rich grains and 25 SiC grains in A12169, giving matrix‐normalized abundances of 275 (+55/−50, 1σ) ppm or, excluding an unusually large grain, 236 (+37/−34) ppm for O‐rich grains and 62 (+15/−12) ppm for SiC grains. For A12236, 18 presolar silicates and 6 SiCs indicate abundances of 58 (+18/−12) and 20 (+12/−8) ppm, respectively.
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