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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29118
Title: Northwest Africa 6232: Visible-near infrared reflectance spectra variability of an olivine diogenite
Authors: CARLI, CRISTIAN 
Pratesi, Giovanni
Moggi-Cecchi, Vanni
ZAMBON, Francesca 
CAPACCIONI, FABRIZIO 
Santoro, Simone
Issue Date: 2018
Journal: METEORITICS & PLANETARY SCIENCE 
Number: 53
Issue: 10
First Page: 2228
Abstract: Visible and near-infrared (VNIR) reflectance is an important spectroscopic technique to identify minerals, and their associations, on planetary body surfaces. Howardites, eucrites, and diogenites (HED) are a class of igneous-like meteorites whose genetic connection with asteroid 4 Vesta has since long been inferred and recently confirmed by Dawn mission results. Pyroxene and olivine are the two major mafic minerals present in HED which can be identified with VNIR reflectance measurements. Thus, studying the compositional variability of those phases and their mixtures by means of laboratory spectroscopic measurements on different diogenitic or eucritic samples is one of the prime methods to better understand the evolution of 4 Vesta's crust. Here, we report the VNIR reflectance spectral analysis of a harzburgitic olivine diogenite, Northwest Africa 6232 (probably paired with Northwest Africa 5480), containing variable amounts of olivine as small grains or aggregates. We found that the olivine diogenite spectral parameters (e.g., band position) of powdered samples and polished slabs are in agreement. Moreover, the olivine diogenite band position shifts from synthetic orthopyroxene in accordance with the presence of olivine and chromite. In particular, the presence of a large olivine clast permits us to determine a linear variation of the band position from synthetic orthopyroxene and olivine, but underestimates the presence of olivine in the olivine diogenite spot.
Acknowledgments: The authors thank the two anonymous reviewers and the editors, A. J. Timothy Jull and, in particular, E. Cloutis, whose comments and suggestion permitted us to improve the quality of the paper.
URI: http://hdl.handle.net/20.500.12386/29118
URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/maps.13056
ISSN: 1086-9379
DOI: 10.1111/maps.13056
Bibcode ADS: 2018M&PS...53.2228C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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