Afficher la notice abrégée

dc.contributor.authorCloutis, Edward A.
dc.contributor.authorGaffey, Michael J.
dc.contributor.authorSmith, Dorian G. W.
dc.contributor.authorSt. J. Lambert, Richard
dc.date.accessioned2018-03-07T16:33:42Z
dc.date.available2018-03-07T16:33:42Z
dc.date.issued1990-06-10
dc.identifier.citationCloutis, E. A., M. J. Gaffey, D. G. W. Smith, and R. St J. Lambert. "Metal-silicate mixtures: Spectral properties and applications to asteroid taxonomy." Journal of Geophysical Research 95 (1990): 8323-8338. DOI: 10.1029/JB095iB06p08323.en_US
dc.identifier.issn0148-0227
dc.identifier.urihttp://hdl.handle.net/10680/1400
dc.description.abstractThe reflectance spectra of combinations of olivine, orthopyroxene, and iron meteorite metal show systematic variations in spectral properties which can be used to constrain many of the physical and chemical properties of the assemblages. The presence of metal most noticeably affects band area ratios, peak:peak and peak:minimum reflectance ratios, and band widths. These parameters are also affected to varying degrees by the abundance and grain size of the metal and silicates and the composition of the silicates. Band width and band areas are useful for determining metal abundance in olivine+metal and orthopyroxene+metal assemblages, respectively. Mafic silicate grain size variations are best determined using band depth criteria. Band centers are most useful for determining mafic silicate composition. Analysis of the reflectance spectrum of the S-class asteroid (8) Flora on the basis of these spectral parameters indicates a surface composed of approximately 50 wt % metal, 40 wt % olivine (Fa=35±10), 10 wt% orthopyroxene (Fs=30+35-25), and perhaps a few weight percent of clino· pyroxene. A substantial amount of the surface seems to consist of a fine-grained ( <45 μm size) component. Analysis of the reflectance spectrum of the A-class asteroid (446) Aetemitas suggests a surface assemblage of approximately 35 wt % metal, 55 wt % olivine (Fa=20±10), 7 wt % clinopyroxene (Fs <17%), and 3 wt % orthopyroxene (Fs <45). A substantial fine-grained (<45 μm size) surface component is also indicated for this asteroid.
dc.description.sponsorshipThis study was supported by grants-in-aid of research from the Central Research Fund of the University of Alberta (to D.G.W.S.), from the Geological Society of America (#3741-87) and Sigma Xi-The Scientific Research Society (to E.A.C.), and NASA Planetary Geology and Geophysics grant NAGW 642 (to M.J.G.).
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/JB095iB06p08323
dc.language.isoenen_US
dc.publisherJournal of Geophysical Researchen_US
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleMetal-silicate mixtures: Spectral properties and applications to asteroid taxonomy.en_US
dc.typeArticleen_US
dc.identifier.doi10.1029/JB095iB06p08323


Fichier(s) constituant ce document

Thumbnail

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée