Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p33a1756o&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P33A-1756
Physics
[3662] Mineralogy And Petrology / Meteorite Mineralogy And Petrology, [3934] Mineral Physics / Optical, Infrared, And Raman Spectroscopy, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [6008] Planetary Sciences: Comets And Small Bodies / Composition
Scientific paper
We have acquired middle infrared (MIR) emission and reflectance spectra of fine particulate minerals and solid and fine particulate meteorite samples under ambient conditions. This dataset is intended to help expand our ability to interpret the MIR spectra of asteroids, possible extinct comets, and other rocky bodies, which contain a record of processes that are key to understanding the formation of our solar system 4.6 G.y. ago. Non-destructive MIR spectra of all samples in this study were collected in the spectroscopy laboratory at Southwest Research Institute [Hamilton and Lucey, 2005, LPSC XXXVI]. We measured the MIR spectra of fine particulate meteorite samples with the objective of providing the planetary community a dataset that can be used for qualitative comparison to asteroid spectra. The current library [Salisbury et al., 1991, Icarus] that is used for comparison to asteroid emissivity spectra represents particle size fractions of < 75 μm. However, several studies have demonstrated that this may be too large a size fraction to be analogous to low inertia asteroid regoliths [e.g., Barucci et al. 2002, Icarus; Emery et al. 2006, Icarus]. Therefore, our MIR spectral library includes a series of meteorite powders having smaller size fractions that may be more analogous to the regoliths of large, low inertia asteroids and will be beneficial for qualitative comparisons. The Smithsonian Institute's analyzed Meteorite Powered Collections (USNM 7073) provided particulate meteorite samples. At this time we have focused on chondritic and a few achondrite samples with particle size fractions < 25 μm. The samples chosen represent many of the samples that were originally measured by Salisbury et al. [1991, Icarus], providing continuity with the existing larger particle size spectral dataset. Furthermore, this work is the first to obtain spectral data of meteorites at wavelengths greater than 13.5 μm, which contain diagnostic features in silicates, carbonates, and oxides and is important for comparison to longer wavelength space-based observations. Additionally, we collected MIR emission and reflectance spectra of fine particulate mineral phases. The mineral libraries currently used to interpret asteroid emissivity spectra lack data having one of more of the following characteristics: 1) equivalence to emissivity data, 2) represent discrete fine size fractions prepared in a consistent manner over a range of compositions, 3) represent discrete fine size fractions of phases prepared in a consistent manner, and /or 4) data that include the range 25-50 μm. Well-characterized particulate pure mineral samples were provided by Arizona State University [Christensen et al., 2000, JGR]. At this time our library consists of samples that were crushed and sieved into five size fractions, < 45 μm, 45-150 μm, 150 μm, 150 μm - 1mm and > 150 μm and we have focused our efforts on phases that are most common in extraterrestrial materials. Future analyses will include particle size fractions of: <10, 10-20 and ~20-45μm.
Hamilton Victoria E.
Osterloo Mikki Michele
No associations
LandOfFree
A Mid-Infrared Emission and Reflectance Library of Meteorites and Fine Particulate Phases does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Mid-Infrared Emission and Reflectance Library of Meteorites and Fine Particulate Phases, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Mid-Infrared Emission and Reflectance Library of Meteorites and Fine Particulate Phases will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-870741