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Titolo:
Near-infrared reflectance spectroscopy of bulk analog materials for planetary crust
Autore:
Harloff, J; Arnold, G;
Indirizzi:
DLR, German Aerosp Ctr, Inst Space Sensor Technol & Planetary Explorat, D-12489 Berlin, Germany DLR Berlin Germany D-12489 & Planetary Explorat, D-12489 Berlin, Germany
Titolo Testata:
PLANETARY AND SPACE SCIENCE
fascicolo: 2, volume: 49, anno: 2001,
pagine: 191 - 211
SICI:
0032-0633(200102)49:2<191:NRSOBA>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTIMATE MIXTURES; VALLES-MARINERIS; SPECTRA; MARS; MINERALS; COMPONENTS; METEORITES; PYROXENES; WATER; BANDS;
Keywords:
NTR reflectance spectroscopy; analog material; remote sensing; terrestrial planet; basalt; pyroxene; surface roughness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Harloff, J Hauptstr 139, D-10827 Berlin, Germany Hauptstr 139 Berlin Germany D-10827 , D-10827 Berlin, Germany
Citazione:
J. Harloff e G. Arnold, "Near-infrared reflectance spectroscopy of bulk analog materials for planetary crust", PLANET SPAC, 49(2), 2001, pp. 191-211

Abstract

In the present study, the differences in near-infrared (NIR) reflectance spectra of powders and bulk surfaces of basalt and pyroxene samples were examined. Furthermore, the effect of a variation in the roughness of the bulk surfaces on the spectra was investigated. The study revealed significant differences between the spectra of powders and bulk surfaces, as observed previously. The most important differences concern the NIR continuum slope andthe band depths of the pyroxene absorption bands I (located close to 1 mum) and II (located close to 2 mum). Compared to powders, the spectra of bulksurfaces are characterized by lower band depths and a preference for a blue-sloped continuum. The effects on bulk surface spectra produced by a variation of the roughness are similar to the well-known effects that arise froma variation of the grain size in powder spectra. Detailed chemical and physical analyses of the mineral and rock samples have enabled a better understanding of the spectral properties than in past studies. A simple model of lateral light passage through bulk surfaces is proposed to explain this analogy between roughness and grain size. The results of this study have implications for the spectroscopic laboratory investigation of analog materials as well as for the interpretation of reflectance spectra acquired in remotesensing situations. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 30/05/20 alle ore 15:21:29