Quantitative determination of the oxidation state of iron in biotite using X-ray photoelectron spectroscopy: II. In situ analyses

Details Quantitative determination of the oxidation state of iron in biotite using X-ray photoelectron spectroscopy: II. In situ analyses Quantitative determination of the oxidation state of iron in biotite using X-ray photoelectron spectroscopy: II. In situ analyses

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.4531r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 61, Issue 21, pp.4531-4537

Computer Science

3

Scientific paper

X-ray photoelectron spectroscopy (XPS) was used to determine in individual biotite crystals in thin sections of ten metapelites and one syenite. The in situ XPS analyses of in biotite crystals in the metapelites were compared with published values determined by Mössbauer spectroscopy (MS) for mineral separates from the same hand samples. The difference between by the two techniques was greatest for samples with the lowest (by MS). For eight metamorphic biotites with = 9-27% comparison of the two techniques yielded a linear correlation of r = 0.94 and a statistically acceptable fit of [ ] xps = [ ] ms . The difference between by the two techniques was greater for two samples with 6% (by MS). For biotite in the syenite sample, determined by both in situ XPS and bulk wet chemistry/electron probe microanalysis were similar. This contribution demonstrates that XPS can be used to analyze bulk in minerals in thin sections when appropriate precautions are taken to avoid oxidation of the near-surface during preparation of samples.

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