Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..528s&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 528-529
Computer Science
Allende Meteorite, Chondrule, Forsterite, Meteoritic Composition, Oxygen Isotopes, Electron Probes, Ion Probes, Scanning Electron Microscopy
Scientific paper
Steele recognized a type of forsterite, characterized by blue CL and very low Fe, that appears to be a component common to CO, CV, and UOC meteorites. This 'blue olivine' has high levels of refractory minor elements, may be a precursor material for chondrules, and is often surrounded by more Fe-rich olivine. The grains and their rims might therefore preserve a record of processes that took place prior to the formation of the different meteorite groups. Chondrules from ordinary and carbonaceous chondrites differ in their O isotopic composition, and so we have begun a study of blue olivines to establish the relationship between this relict precursor material in different meteorite classes and their relationship to chondrules. The blue olivines were found using the high-energy electron gun used for charge compensation of insulators on the Manchester Isolab 54 ion probe. We scanned the electron beam over the sample and noted grains that luminesced blue. These were then examined by Scanning Electron Microscopy/Energy Dispersive X-ray (SEM/EDX) to identify those that were forsterite. Oxygen isotope analyses are being carried out on the Manchester ion probe. This instrument employs a number of features designed to facilitate accurate measurement of O isotope ratios. These include simultaneous collection of all three isotopes, and detection of O-18 and O-17 with a new type of electron multiplier that has been found to show excellent long-term stability. We have obtained reproducible O-18/O-16 ratios from insulators (quartz and olivine) and we are undertaking measurements of O-18/O-16 and O-17/O-16 in the Julesburg and Allende blue olivine grains.
Lyon Ian C.
Saxton John M.
Turner Gary
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