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Full-Text Articles in Physical Sciences and Mathematics
Mid-Infrared Optical Constants Of Labradorite, A Triclinic Plagioclase Mineral, Cheng Ye, Melinda J. Rucks, Jessica A. Arnold, Timothy D. Glotch
Mid-Infrared Optical Constants Of Labradorite, A Triclinic Plagioclase Mineral, Cheng Ye, Melinda J. Rucks, Jessica A. Arnold, Timothy D. Glotch
Geosciences Research Data
Plagioclase feldspar is the most abundant rock-forming mineral in the crust of the Earth, Moon, and Mars, and is also an important component in some minor bodies in the Solar System. The distribution, abundance, and precise composition of plagioclase on planetary surfaces from remote sensing data is an important tool for evaluating changing conditions during magma evolution. Optical constants are critical input parameters in radiative transfer theory, which enables modeling of spectra for the extraction of mineral abundances and grain sizes from a remotely sensed spectrum. Mid-infrared (MIR) optical constants of most triclinic rock-forming minerals are not available due to …
Spectral Properties Of Chloride Salt-Bearing Assemblages: Implications For Detection Limits Of Minor Phases In Chloride-Bearing Deposits On Mars, Cheng Ye, Timothy Glotch
Spectral Properties Of Chloride Salt-Bearing Assemblages: Implications For Detection Limits Of Minor Phases In Chloride-Bearing Deposits On Mars, Cheng Ye, Timothy Glotch
Geosciences Research Data
Chloride salt-bearing deposits have been identified throughout the southern highlands of Mars and have been suggested to be two component mixtures of anhydrous chloride salt and regional basaltic regolith. On Earth, chlorides typically occur as evaporite salts associated with other evaporite minerals such as carbonate and sulfate, and chemical weathering products like clays. In this laboratory study, we document the visible/near-infrared (VNIR) reflectance and mid-infrared (MIR) emissivity spectral characteristics of a series of chloride salt-bearing mineral assemblages. Our data show that the spectral features of various powder mixtures change systematically with variable additional mineral concentrations and particle sizes. Specifically, small …
Mid-Ir Emissivity Spectra Of Mg- And Ca- Carbonates, Oxides, And Hydroxides, Timothy Glotch
Mid-Ir Emissivity Spectra Of Mg- And Ca- Carbonates, Oxides, And Hydroxides, Timothy Glotch
Geosciences Research Data
We used three methods—spectral index mapping, linear spectral mixture analysis, and factor analysis and target transformation—to determine if carbonate decomposition products, including lime (CaO), periclase (MgO), portlandite (Ca(OH)2), and brucite (Mg(OH)2), are present on the surface of Mars. Using an expanded spectral library that includes decomposition products of calcite and magnesite, we deconvolved a binned emissivity data set from the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES). The deconvolution model indicates that anhydrous carbonates are not present at kilometer scales above the TES detection limit; however, carbonate decomposition products may be present at or above the TES detection limit in …