Investigation of Presolar Silicate Grains from Enstatite Chondrites
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چکیده
منابع مشابه
Isotopic Composition of Silicon Carbide in the Co3 Chondrite Colony
Introduction: Presolar grains have been identified in primitive members of all chondrite classes [1,2]. The isotopic compositions of presolar grains provide probes of galactic evolution and nucleosynthesis in stars [3,4], while the abundances and characteristics of presolar grains contain a record of thermal processing in the solar system [2,5]. Most of the detailed isotopic work has been done ...
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We have investigated the presolar grain inventories of two CR chondrites, QUE 99177 and MET 00426, which are less altered than most members of this meteorite group. Both meteorites contain high abundances of O-anomalous presolar grains, with concentrations of 220 ± 40 and 160 ± 30 ppm for QUE 99177 and MET 00426, respectively. The presolar grain inventories are dominated by ferromagnesian silic...
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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...
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Introduction: Presolar grains are particularly abundant in primitive extraterrestrial materials such as IDPs [e.g. 1-3] and the matrices of the least altered chondrites [4-6]. To date, the presolar silicate and oxide inventories of the primitive chondrites Acfer 094 [4-7] and ALHA 77307 [7] have been reported extensively. More recently, the search for presolar silicates and oxides has been exte...
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The most abundant matrix minerals in chondritic meteorites—hydrated phyllosilicates and ferrous olivine crystals—formed predominantly in asteroids during fluid-assisted metamorphism. We infer that they formed from minerals present in three less altered carbonaceous chondrites that have silicate matrices composed largely of micrometerand nanometer-sized grains of crystalline forsterite Mg2SiO4 a...
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