Micro Raman spectroscopy of amphiboles and pyroxenes in the Martian meteorites Zagami and Lewis Cliff 88516

Details Micro Raman spectroscopy of amphiboles and pyroxenes in the Martian meteorites Zagami and Lewis Cliff 88516 Micro Raman spectroscopy of amphiboles and pyroxenes in the Martian meteorites Zagami and Lewis Cliff 88516

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..155m&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 1, pp. 155-159 (2000).

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We studied micro Raman spectroscopy of amphiboles and pyroxenes in the Martian meteorites Zagami and LEW88516. The obtained Raman spectra of the amphiboles are similar to those of kaersutite, reconfirming the previous studies that they are kaersutitic amphiboles enriched in Ca, Al and Ti. Even though actinolite belongs to the same amphibole group (calcic amphibole) as kaersutite, the Raman spectra of terrestrial actinolite are distinct from those of kaersutite, probably reflecting complex amphibole crystal structures. Al-Ti-rich pyroxene observed in the magmatic inclusions within LEW88516 olivine is compositionally similar to kaersutite, but shows Raman spectra nearly identical to the regular pyroxene rather than amphibole. In contrast to amphibole, this will be due to relatively simple crystal structures of pyroxene. Thus, the Raman spectra of Al-Ti-rich phases in the Martian meteorites are distinct between kaersutite and Al-Ti-rich pyroxene, and this study demonstrates that micro Raman spectroscopy is one of the best tools to perform mineralogical characterization of mineral phases in Martian meteorites.

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