A coordinated spectral, mineralogical, and compositional study of ordinary chondrites

dc.contributor.authorDunn, Tasha L.
dc.contributor.authorMcCoy, Timothy J.
dc.contributor.authorSunshine, J. M.
dc.contributor.authorMcSween, Harry Y.
dc.date.accessioned2013-04-09T19:33:35Z
dc.date.available2013-04-09T19:33:35Z
dc.date.issued2010
dc.description.abstractMineral compositions and abundances derived from visible/near-infrared (VIS/NIR or VNIR) spectra are used to classify asteroids, identify meteorite parent bodies, and understand the structure of the asteroid belt. Using a suite of 48 equilibrated (types 4-6) ordinary (H, L, and LL) chondrites containing orthopyroxene, clinopyroxene, and olivine, new relationships between spectra and mineralogy have been established. Contrary to previous suggestions, no meaningful correlation is observed between band parameters and cpx/(opx+cpx) ratios. We derive new calibrations for determining mineral abundances (ol/(ol+px)) and mafic silicate compositions (Fa in olivine, Fs in pyroxene) from VIS/NIR spectra. These calibrations confirm that band area ratio (BAR) is controlled by mineral abundances, while band I center is controlled by mafic silicate compositions. Spectrally-derived mineralogical parameters correctly classify H, L and LL chondrites in ~80% of cases, suggesting that these are robust relationships that can be applied to S(IV) asteroids with ordinary chondrites mineralogies. Comparison of asteroids and meteorites using these new mineralogical parameters has the advantage that H, L and LL chemical groups were originally defined on the basis of mafic silicate compositions.
dc.format.extent789–797
dc.identifier0019-1035
dc.identifier.citationDunn, Tasha L., McCoy, Timothy J., Sunshine, J. M., and McSween, Harry Y. 2010. "<a href="https://repository.si.edu/handle/10088/20463">A coordinated spectral, mineralogical, and compositional study of ordinary chondrites</a>." <em>Icarus</em>, 208, (2) 789–797. <a href="https://doi.org/10.1016/j.icarus.2010.02.016">https://doi.org/10.1016/j.icarus.2010.02.016</a>.
dc.identifier.issn0019-1035
dc.identifier.urihttp://hdl.handle.net/10088/20463
dc.relation.ispartofIcarus 208 (2)
dc.titleA coordinated spectral, mineralogical, and compositional study of ordinary chondrites
dc.typearticle
sro.description.unitNH-Mineral Sciences
sro.description.unitNMNH
sro.identifier.doi10.1016/j.icarus.2010.02.016
sro.identifier.itemID90560
sro.identifier.refworksID9326
sro.identifier.urlhttps://repository.si.edu/handle/10088/20463

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