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Paper: Comet Samples Returned by Stardust, Insight into the Origin of Comets and Crystalline Silicates in Disks
Volume: 414, Cosmic Dust—Near and Far
Page: 157
Authors: Brownlee, D. E.; Joswiak, D.; Matrajt, G.; Tsou, P.
Abstract: The comet samples returned by the NASA Stardust mission contain abundant crystalline silicates that are very similar to inner solar materials found in primitive asteroidal meteorites. Isotopic compositions indicate that the bulk of the silicates from comet Wild 2 formed in the solar nebula and that the pre-solar content is less than in primitive meteorites. It appears that the bulk of the coarse-grained components of this Jupiter Family Comet formed in the inner regions of the solar nebula and were transported to the edge of the solar system where Kuiper Belt comets accreted. The data is consistent with substantial large-scale radial transport of micron to millimeter grains in the solar nebula. The isotopic, elemental and mineralogical compositions of the majority of Wild 2 silicates as well as the textural relationship between phases do not appear to be compatible with origin by 1000 K annealing of pre-solar grains.
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