Computer Science
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2507h&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Sept. 1990, p. 2507-2510. Research supported by the Sharp Fund.
Computer Science
2
Chondrites, Olivine, Raman Spectroscopy, Annealing, Luminescence, Mineralogy, Raman Spectra
Scientific paper
Raman spectra, generally in the delta wavelength range of 500-1200/cm, were taken from olivines in 37 ordinary chondrites to test whether the prominent laboratory-produced high-shock feature of olivine near 1100/cm occurs in the olivines of the heavily shocked black chondrites. In addition to the lines of olivine, lines from the abundant orthopyroxene were also detected. It was found that the 1100/cm feature was absent from all of the spectra and that all spectra, except that taken from the chondrite Ramsdorf (which showed line broadening and strong luminescence), were essentially indistinguishable and very similar to spectra taken from the unshocked mineral. The absence of the 1100/cm feature and of strong luminescence from the chondritic Raman spectra, even in meteorites whose olivines are nearly X-ray amorphous, is thought to be due to thermal annealing during the comparatively slow cooling from peak shock temperatures.
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