A5034898729- Planetary Science and Exploration
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Space Science and Extraterrestrial Life
- Hydrocarbon exploration and reservoir analysis
- Marine and environmental studies
- Isotope Analysis in Ecology
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Maritime and Coastal Archaeology
- Spectroscopy and Chemometric Analyses
- Geological formations and processes
- Geological Studies and Exploration
- Ancient Mediterranean Archaeology and History
- Aeolian processes and effects
- Biomedical and Engineering Education
- Remote-Sensing Image Classification
- Building materials and conservation
- Mineralogy and Gemology Studies
- Mineral Processing and Grinding
- Clay minerals and soil interactions
Johns Hopkins University Applied Physics Laboratory
2015-2024
Johns Hopkins University
2020-2021
Planetary Science Institute
2012
University of Tennessee at Knoxville
2008-2012
Universidad Nacional de Colombia
2008
Abstract The investigation of hyperspectral data from the Mars Reconnaissance Orbiter Compact Imaging Spectrometer for (CRISM) and Observatoire pour la Minéralogie, L'Eau, les Glaces et l'Activitié (OMEGA) on Express has revealed an increasingly diverse suite minerals present Martian surface. A revised set 60 spectral parameters derived corrected reflectance at key wavelengths in CRISM targeted observations designed to capture known diversity surface mineralogy is presented here as “summary...
Research Article| October 01, 2013 A hematite-bearing layer in Gale Crater, Mars: Mapping and implications for past aqueous conditions A.A. Fraeman; Fraeman 1Department of Earth Planetary Sciences, Washington University St. Louis, Missouri 63130, USA Search other works by this author on: GSW Google Scholar R.E. Arvidson; Arvidson J.G. Catalano; Catalano J.P. Grotzinger; Grotzinger 2Department Geological California Institute Technology, Pasadena, 91125, R.V. Morris; Morris 3NASA Johnson Space...
A well-preserved, ancient delta deposit, in combination with ample exposures of carbonate rich materials, make Jezero Crater Nili Fossae a compelling astrobiological site. We use Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) observations to characterize the surface mineralogy crater and surrounding watershed. Previous studies have documented occurrence olivine carbonates region. focus on correlations between these two well studied lithologies map position shape 1 μm absorption...
Abstract Previous identification of serpentine and magnesium carbonate in the eastern Nili Fossae region Mars indicates hydrothermal alteration an olivine‐rich protolith. Here we characterize Fe/Mg phyllosilicates associated with these units present spectral evidence for presence a talc component, distinguishable from saponite. Locations are exclusively talc‐related phyllosilicates. In westernmost portions region, where mafic protolith dominates, display wide degree chloritization. We...
The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on the Orbiter (MRO) collected hyperspectral images of Martian surface and atmosphere from September 27, 2006, through May 7, 2022. Over that time, nearly twenty scientific investigations were completed, most which arose as a result findings previous investigations. Two review papers published in 2009 (Murchie et al., 2009a, b) described initial two-year investigation during MRO's Primary Science Phase, its key findings, CRISM...
Abstract Orbital data acquired by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) and High Resolution Science Experiment instruments on Orbiter (MRO) provide a synoptic view of compositional stratigraphy floor Gale crater surrounding area where Laboratory (MSL) Curiosity landed. Fractured, light‐toned material exhibits 2.2 µm absorption consistent with enrichment in hydroxylated silica. This may be distal sediment from Peace Vallis fan, cement fracture fill containing unit...
Abstract— Nine howardites and two diogenites were recovered from the Pecora Escarpment Icefield (PCA) in 2002. Cosmogenic radionuclide abundances indicate that samples are paired they constituted an approximately 1 m (diameter) meteoroid prior to atmospheric entry. At about diameter, PCA 02 HED group represents one of largest single pre‐atmospheric pieces Vestan surface yet described. Mineral textural variations measured six investigate meter‐scale diversity surface. compositions span range...
Abstract Identifying and mapping olivine on asteroid 4 Vesta are important components to understanding differentiation that body, which is one of the objectives Dawn mission. Harzburgitic diogenites main olivine‐bearing lithology in howardite‐eucrite‐diogenite ( HED ) meteorites, a group samples thought originate from Vesta. Here, we examine all Antarctic harzburgites estimate that, scales resolvable by Dawn, abundances putative harzburgite exposures surface likely at best 10–30% range, but...
Refined calibrations of CRISM images are enabling identification smaller deposits unique aqueous materials on Mars that reveal changing environmental conditions at the region surrounding Mawrth Vallis. Through characterization these clay-sulfate assemblages and their association with layered, phyllosilicate units this region, more details geochemical history can be gleaned. A stratigraphy including five distinct mineral horizons is mapped using compositional data from over CTX HRSC imagery...
Abstract Compositions of basaltic and ultramafic rocks analyzed by Mars rovers occurring as Martian meteorites allow predictions metamorphic mineral assemblages that would form under various thermophysical conditions. Key minerals identified remote sensing roughly constrain temperatures pressures in the crust. We use a traditional approach (phase diagrams) to assess low‐grade/hydrothermal equilibrium assemblages. Basaltic should produce chlorite + actinolite albite silica, accompanied...
Abstract Due to its size and observable record of ancient rock, Mars is key understanding crustal formation on planetary bodies, including Venus Earth, which may have derived their first stable crust from mantle-overturn melting. Recent evidence that martian contains an evolved component supports inferences a pervasive, buried feldspathic the crust. With data Compact Reconnaissance Imaging Spectrometer for (CRISM), we searched lithologies in pre-Noachian (older than ca. 4.1 Ga) blocks...
We present a method for mapping exposures of Fe/Mg‐rich phyllosilicates on the Martian surface using THEMIS daytime multispectral thermal infrared images. The primary utility this technique comes from fact that coverage is near‐global at 100 m/pixel, so it offers opportunity to extend and improve upon phyllosilicate maps created CRISM and/or OMEGA near‐infrared data alone. spectral index formulation used consists sum band ratios, weighted in different proportions. An initial was determined...
Abstract We used Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) multispectral mapping data to assess heterogeneity of primary and secondary mineral compositions Noachian‐aged regions Martian crust. Multispectral corroborate interpretations from CRISM targeted observations Observatoire pour la Mineralogie, l’Eau, les Glaces et l’Activité global large horizontal differences in vertical crustal structures, degree grade alteration minerals. analysis conducted at a combination high...
Abstract The formation of widespread phyllosilicate‐bearing near‐surface layers on Mars has often been attributed to pedogenesis, a process weathering basaltic soils by continued exposure meteoric water percolating down from the surface, which can result in aluminum phyllosilicates forming over iron‐magnesium phyllosilicates. We present evidence an Fe/Mg‐smectite bearing layer stratigraphically above Al‐phyllosilicates three circular features south Coprates Chasma, suggesting that some other...