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Near-infrared reflectance spectroscopy of Ca-rich clinopyroxenes and prospects for remote spectral characterization of planetary surfaces.

Schade, U. and Wäsch, R. and Moroz, L. (2004) Near-infrared reflectance spectroscopy of Ca-rich clinopyroxenes and prospects for remote spectral characterization of planetary surfaces. Icarus: International Journal of Solar System Studies, 168, pp. 80-92.

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Abstract

We present results of laboratory near-infrared reflectance studies of a set of calcic pyroxenes with comparable calcium contents (Wo45-50) but variable iron content and oxidation states. This new dataset complements earlier published data (Cloutis and Gaffey, 1991, J. Geophys. Res. 96, 22809-28826, and references therein). In particular, our new spectra extend the scarce available spectral data on chemically analyzed Fe-rich high-Ca clinopyroxenes. We attempted to interpret the spectral behavior of our samples in terms of chemistry and coordination site occupancies. Tentatively, we conclude that Fe-rich calcic pyroxenes have very low contents of Fe2+ in the M2 sites and belong to the spectral type A lacking the 2-μm band. This may be due to high Ca and Mn contents in these pyroxenes. Fe-poor high-Ca pyroxenes are more spectrally variable. In general, they tend to belong to the spectral type B with two major bands near 1 and 2 μm, unless the samples have high Fe3+/Fe2+ ratios or are rich in Mn and Ca. Some of them (including unusual meteorite Angra dos Reis) are of type B despite very high Ca contents. We applied the Modified Gaussian Model (MGM) to characterize three major Fe2+ absorption bands in the 1-μm region of the spectra of Ca-rich pyroxenes. Only the band due to Fe2+ in the M1 coordination site near 1.15 μm may be potentially useful to estimate the Fe content in calcic pyroxenes on remotely-sensed surfaces of Solar System bodies. The spectral variability of basaltic meteorites (angrites that are rich in calcic pyroxenes is also discussed. The presence of spectral type A calcic: pyroxenes in these meteorites complicates unambiguous identification of olivine in asteroid spectra.

Item URL in elib:https://elib.dlr.de/46308/
Document Type:Article
Title:Near-infrared reflectance spectroscopy of Ca-rich clinopyroxenes and prospects for remote spectral characterization of planetary surfaces.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schade, U.BESSY GmbHUNSPECIFIED
Wäsch, R.UNSPECIFIEDUNSPECIFIED
Moroz, L.UNSPECIFIEDUNSPECIFIED
Date:March 2004
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:168
Page Range:pp. 80-92
Status:Published
Keywords:Asteroids, Meteorites, Mineralogy, Spectroscopy
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Berlin-Adlershof
Institutes and Institutions:Optical Information Systems
Deposited By: Moroz, Dr. Liubov
Deposited On:03 Jan 2007
Last Modified:27 Apr 2009 13:21

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