We report here a reflectance spectroscopy investigation of a set of achondrite meteorites with variable mineralogical and chemical composition. The samples were analyzed in the VNIR (350 - 22500 nm) and MidIR (6000 - 15000nm) spectral ranges on both powders (grain sizes < 100 μm) and slabs. The chemistry and mineralogy of the samples were investigated in the University of Florence by a combination of SEM and EPMA. In the VNIR spectral range, we observe a quite clear spectroscopic distinction between samples with high olivine content with respect to samples with high pyroxene content. The high-olivine group is dominated by the spectral features of olivine with a broad and asymmetric band centered at about 1100 nm. A deep and quite symmetric band around 900 nm and a smaller but broader band at about 1900 nm characterize the high pyroxene group. The FTIR investigation confirms the VNIR results but also reveals the peculiar spectroscopic features of sample Asuka 881548 whose Reststrahlen bands differ significantly from the other members of the high pyroxene group. From a quantitative comparison between slabs and powders we observe only minor variations of the spectral features while, as expected, spectral contrast is highly enhanced in powders for the VNIR measurements and in slabs for MidIR spectra. We compare the VNIR spectra of our samples with earth based spectroscopic observations in order to highlight ad quantify similarities between spectral features of achondrites and possible parental bodies.

Reflectance spectroscopy of ol-bearing ungrouped achondrite meteorites / Bruschini E.; Carli C.; Cuppone T.; Pratesi G.. - ELETTRONICO. - (2022), pp. 777-777. ((Intervento presentato al convegno Congresso congiunto SGI-SIMP, Geosciences for a sustainable future.

Reflectance spectroscopy of ol-bearing ungrouped achondrite meteorites

Cuppone T.;Pratesi G.
2022

Abstract

We report here a reflectance spectroscopy investigation of a set of achondrite meteorites with variable mineralogical and chemical composition. The samples were analyzed in the VNIR (350 - 22500 nm) and MidIR (6000 - 15000nm) spectral ranges on both powders (grain sizes < 100 μm) and slabs. The chemistry and mineralogy of the samples were investigated in the University of Florence by a combination of SEM and EPMA. In the VNIR spectral range, we observe a quite clear spectroscopic distinction between samples with high olivine content with respect to samples with high pyroxene content. The high-olivine group is dominated by the spectral features of olivine with a broad and asymmetric band centered at about 1100 nm. A deep and quite symmetric band around 900 nm and a smaller but broader band at about 1900 nm characterize the high pyroxene group. The FTIR investigation confirms the VNIR results but also reveals the peculiar spectroscopic features of sample Asuka 881548 whose Reststrahlen bands differ significantly from the other members of the high pyroxene group. From a quantitative comparison between slabs and powders we observe only minor variations of the spectral features while, as expected, spectral contrast is highly enhanced in powders for the VNIR measurements and in slabs for MidIR spectra. We compare the VNIR spectra of our samples with earth based spectroscopic observations in order to highlight ad quantify similarities between spectral features of achondrites and possible parental bodies.
Geosciences for a sustainable future, Torino 19-21 Settembre 2022
Congresso congiunto SGI-SIMP, Geosciences for a sustainable future
Bruschini E.; Carli C.; Cuppone T.; Pratesi G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1287289
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