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Mineralogical and spectroscopic investigation of enstatite chondrites by X-ray diffraction and infrared reflectance spectroscopy

Izawa, M; King, Penelope; Flemming, R.L.; Peterson, R.C.; McCausland, P.J.A.

Description

The mineralogy and infrared reflectance spectra of 13 Enstatite (E) chondrite meteorite finds spanning the full range of textural alteration grades in both EL and EH classes have been investigated. Rietveld refinement of high-resolution powder X-ray diffraction (XRD) data was used to determine quantitative major mineral abundances. Sample-correlated mid-infrared (2.0 to 25.0 m; 4500 cm-1 to 400 cm-1) reflectance infrared spectra were collected for each meteorite. Spectral features due to the...[Show more]

dc.contributor.authorIzawa, M
dc.contributor.authorKing, Penelope
dc.contributor.authorFlemming, R.L.
dc.contributor.authorPeterson, R.C.
dc.contributor.authorMcCausland, P.J.A.
dc.date.accessioned2015-12-13T22:43:51Z
dc.identifier.issn0148-0227
dc.identifier.urihttp://hdl.handle.net/1885/79388
dc.description.abstractThe mineralogy and infrared reflectance spectra of 13 Enstatite (E) chondrite meteorite finds spanning the full range of textural alteration grades in both EL and EH classes have been investigated. Rietveld refinement of high-resolution powder X-ray diffraction (XRD) data was used to determine quantitative major mineral abundances. Sample-correlated mid-infrared (2.0 to 25.0 m; 4500 cm-1 to 400 cm-1) reflectance infrared spectra were collected for each meteorite. Spectral features due to the fundamental lattice vibrations of the silicates, primarily enstatite, dominate the spectra of these meteorites over most of the spectral range investigated. The spectral features related to primary (i.e., pre-terrestrial) mineralogy include fundamental stretching and bending lattice modes (∼8.3-25.0 m; 1200-400 cm-1), overtones and combinations of the fundamental modes (∼4.5-6.1 m; 2200-1650 cm-1), and the principle Christensen feature (∼8.3 m; 1200 cm-1). Terrestrial weathering products including Fe-oxyhydroxides, gypsum, and carbonates occur in most of these meteorites and contribute to some spectral features: particularly an asymmetric feature near ∼2.6 to 3.8 m (3800 to 2600 cm-1) attributed to adsorbed, hydrogen-bonded, and/or structural OH and H2O, and a feature near ∼6.2 m (1625 cm-1) attributed to adsorbed, hydrogen-bonded, and/or structural H2O. Modal mineral abundances determined by Rietveld refinement have been used to calculate model grain densities for each meteorite. Bulk magnetic susceptibility measurements combined with modal mineralogy and grain densities reveal a trend toward lower grain density and lower bulk susceptibility with increased terrestrial weathering.
dc.publisherAmerican Geophysical Union
dc.sourceJournal of Geophysical Research
dc.subjectKeywords: enstatite chondrite; grain size; infrared spectroscopy; lattice dynamics; magnetic susceptibility; meteorite; mineralogy; Rietveld analysis; silicate; spectral analysis; spectral reflectance; trend analysis; weathering rate; X-ray diffraction
dc.titleMineralogical and spectroscopic investigation of enstatite chondrites by X-ray diffraction and infrared reflectance spectroscopy
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume115
dc.date.issued2010
local.identifier.absfor040302 - Extraterrestrial Geology
local.identifier.ariespublicationf5625xPUB7839
local.type.statusPublished Version
local.contributor.affiliationIzawa, M, University of Western Ontario
local.contributor.affiliationKing, Penelope, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFlemming, R.L., University of Western Ontario
local.contributor.affiliationPeterson, R.C., Queens University
local.contributor.affiliationMcCausland, P.J.A., University of Western Ontario
local.description.embargo2037-12-31
local.bibliographicCitation.issue7
local.bibliographicCitation.startpageE07008(1
local.bibliographicCitation.lastpage18)
local.identifier.doi10.1029/2009JE003452
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T09:37:44Z
local.identifier.scopusID2-s2.0-77955181031
CollectionsANU Research Publications

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