Pyroxene spectroscopy revisited - Spectral-compositional correlations and relationship to geothermometry

Details Pyroxene spectroscopy revisited - Spectral-compositional correlations and relationship to geothermometry Pyroxene spectroscopy revisited - Spectral-compositional correlations and relationship to geothermometry

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9622809c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 25, 1991, p. 22,809-22,826. Research supported by Geological Soc

Mathematics

Logic

170

Absorption Spectra, Chemical Composition, Pyroxenes, Spectral Reflectance, Transmittance, Geotemperature, Grain Size, Metamorphism (Geology)

Scientific paper

Pyroxene reflectance and transmittance spectra have been examined in a search for systematic relationships between spectral features and compositional variations and to assess the applicability of reflectance spectroscopy to pyroxene geothermometry. Orthopyroxenes containing up to about 11 percent Wollastonite show a positive correlation between Fe(2+) content and wavelength positions of the major absorption bands. Aluminum-rich orthopyroxenes display absorption bands at lower than expected wavelengths. Spectral-compositional relationships are more complex for clinopyroxenes, showing both positive and negative correlations between band positions and major cation abundances. These relationships are further complicated by the presence of significant amounts of other transition series elements such as Ti and Cr and by the presence of exsolved phases and compositional zonations. Contours of the wavelength positions of band minima projected onto the pyroxene tetralateral generally exhibit concave downward shapes. The orientations of the contours relative to pyroxene geotherms are such as to effectively preclude the use of spectroscopy to significantly constrain the temperatures of formation of pyroxenes.

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