Presolar O- and C-anomalous grains in unequilibrated ordinary chondrite matrices

Presolar Grains from Primitive Ordinary Chondrites

Kobayashi, K. Nagashima, N. Sakamoto, S. S. Russell, S. Itoh and H. Yurimoto. Division of Earth and Planetary Sciences, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan ([email protected]); Hawai’i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai’i at Manoa, Honolulu, HI 96822, USA; Department of Mineralogy, The Natura...

Iron-60 in Troilites from an Unequilibrated Ordinary Chondrite and the Initial

Introduction: Short-lived radionuclides were synthesized either by irradiation with energetic particles or by stellar nucleosynthesis. The recent discovery in CAIs from carbonaceous chondrites of evidence for live 10 Be [1], which is only produced by energetic-particle irradiation , has led to suggestions that the major portion of many short-lived radionuclides (was produced by irradiation. How...

PRESOLAR SiC GRAINS OF TYPE C

Nanosims Investigation of Presolar Material in Chondrites of the Cr

Introduction: Silicates and oxides are among the most abundant types of presolar dust grains observed in primitive solar system matter [e.g.,1,2]. The CR chondrite clan, consisting of the CR, CH, and CB chondrite groups, contains some of the most primitive meteorites, with characteristic bulk 15 N-enrichments [5,6]. High abundances of presolar silicates and carbonaceous grains were recently rep...

Continued Characterization of Presolar Silicate Grains from the Acfer 094 Carbonaceous Chondrite

Introduction: Among circumstellar grains produced around O-rich evolved stars, silicate grains are the most abundant [1]. Until recently, the identification of presolar silicate grains in extraterrestrial materials proved difficult due in part to their destruction by parent body processes, requiring analysis of very primitive samples, and to the experimental challenge presented by their submicr...