96 research outputs found
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High-temperature chemical processing on asteroids: An oxygen isotope perspective
From the introduction: Small planetary bodies accreted within 2.4 Myr of solar system formation [1]. The primitive materials (CAIs, chondrules, matrix) incorporated into these asteroids were altered by a variety of secondary processes, including aqueous alteration, shock metamorphism, thermal metamorphism and melting. Here we look primarily at the role played by thermal metamorphism and melting in altering the oxygen isotope systematics of asteroidal materials
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New oxygen isotope evidence for the origin of mesosiderites and main group pallasites
High precision oxygen isotope analyses reveal that the silicate portion of mesosiderites are indistinguishable from the HEDs and suggest a common origin. However, the main group pallasites have a distinct signature, and therefore different source
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Are CK chondrites really a distinct group or just equilibrated CVs?
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Towards the isotopic measurement of solar wind carbon in the Genesis silicon target
We report a current stage of the carbon isotope measurements in the Genesis Si target
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Oxygen isotopes in CO3 chondrites
Oxygen isotope analyses were undertaken on seven CO3 chondrites. No correlation was seen between metamorphic grade in CO3s and oxygen isotopic compositions. Results suggest that ALH77307 should be reclassified as a unique chondrite
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Extraction and analysis of microcrater residues using focused ion beam microscopy
We describe results from a new technique using dual beam FIB/SEM with which impact residues can be extracted from microcraters and analysed by EDS. This will allow the determination of residue compositions from Stardust craters
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Determining the effects of aqueous alteration on the distribution of oxygen isotopes in carbonaceous chondrites
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