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Full-Text Articles in Physical Sciences and Mathematics
Precipitation Recorded In The Turkana Basin From 2005 To 2022., Acacia Leakey, Greg Henkes, Mae Saslaw, Dino Martins
Precipitation Recorded In The Turkana Basin From 2005 To 2022., Acacia Leakey, Greg Henkes, Mae Saslaw, Dino Martins
Geosciences Research Data
This is a dataset of precipitation recorded at three sites in northern Kenya near Lake Turkana using standard rain gauges. The data was recorded at the Koobi Fora Research Station (3.947736, 36.186166) from March 2003 until 2006, at the Turkana Basin Institute’s Ileret facility (4.28510, 36.262158) from 2006 to 2022 and at the Turkana Basin Institute’s Turkwel facility (3.140825, 35.864599) from 2012 to 2022. The data was collected manually by TBI staff observing gradation lines on the collectors following rainfall events and recorded as a single total for each 24 hour period.
Particle Size Effects On Mid-Ir Spectra Of Lunar Analog Minerals In A Simulated Lunar Environment, Katherine Shirley, Timothy Glotch
Particle Size Effects On Mid-Ir Spectra Of Lunar Analog Minerals In A Simulated Lunar Environment, Katherine Shirley, Timothy Glotch
Geosciences Research Data
Mid‐infrared spectroscopic analysis of the Moon and other airless bodies requires a full accounting of spectral variation due to the unique thermal environment in airless body regoliths and the substantial differences between spectra acquired under airless body conditions and those measured in an ambient environment on Earth. Because there exists a thermal gradient within the upper hundreds of microns of lunar regolith, the data acquired by the Diviner Lunar Radiometer Experiment are not isothermal with wavelength. While this complication has been previously identified, its effect on other known variables that contribute to spectral variation, such as particle size and porosity, …
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 …
Changes In Mineralogy And Geochemistry Of Quartz And Feldspars In Response To Impact Cratering, Steven Jaret
Changes In Mineralogy And Geochemistry Of Quartz And Feldspars In Response To Impact Cratering, Steven Jaret
Geosciences Research Data
Impact cratering is an important geologic process that has affected all objects in the Solar System. The goal of this work is to understand how this process affects the mineralogy and geochemistry of planetary surfaces. Studies of extraterrestrial materials (e.g., laboratory studies of meteorites) and studies of planetary surfaces via orbiter or lander missions encounter impacted and shocked materials. Therefore, knowing how this secondary process of cratering has altered the rocks and minerals is critical to our ability to deconvolve the secondary effects of shock from the original primary geology. Specifically, I seek to understand impact metamorphism in three ways: …
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 …