A5025308530- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Space Science and Extraterrestrial Life
- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Marine and environmental studies
- Mineralogy and Gemology Studies
- earthquake and tectonic studies
- Laser-induced spectroscopy and plasma
- Archaeological and Geological Studies
- High-pressure geophysics and materials
- Water Systems and Optimization
- Aquatic and Environmental Studies
- Aeolian processes and effects
- Maritime and Coastal Archaeology
- Historical and Architectural Studies
- Water management and technologies
- Geotechnical and Geomechanical Engineering
- Geological and Geophysical Studies Worldwide
- Flow Measurement and Analysis
- Ancient Mediterranean Archaeology and History
- Geomagnetism and Paleomagnetism Studies
Glenn Research Center
2020-2023
Wesleyan University
2023
Universities Space Research Association
2018
University of New Mexico
2014-2017
Abstract We conducted a petrologic study of apatite within 12 Martian meteorites, including 11 shergottites and one basaltic regolith breccia. These data were combined with previously published to gain better understanding the abundance distribution volatiles in interior. Apatites individual meteorites span wide range compositions, indicating they did not form by equilibrium crystallization. In fact, intrasample variation is best described either fractional crystallization or crustal...
Abstract The timing and mode of deposition for Martian regolith breccia Northwest Africa (NWA) 7034 were determined by combining petrography, shape analysis, thermochronology. NWA is composed igneous, impact, brecciated clasts within a thermally annealed submicron matrix pulverized crustal rocks devitrified impact/volcanic glass. are likely lithified portions with some evidence past hydrothermal activity. Represented lithologies primarily ancient materials crystallization ages as old 4.4 Ga....
Abstract The bulk matrix domain of the Martian breccia NWA 7034 was examined petrographically and isotopically to better understand provenance age source material that make up breccia. Both 147 Sm‐ 143 Nd 146 142 results for mineral separates from portion suggest various lithological components in probably formed contemporaneously ~4.44 Ga ago. This old is excellent agreement with upper intersection ages (4.35–4.45 Ga) U‐Pb discordia also concordia defined by zircon baddeleyite grains...
Abstract The Martian meteorites record a wide diversity of environments, processes, and ages. Much work has been done to decipher potential mantle sources for magmas their interactions with crustal surface environments. Chlorine isotopes provide unique opportunity assess between mantle‐derived the crust. We have measured Cl‐isotopic composition 17 samples that span range known ages, reservoirs. 37 Cl mantle, as represented by olivine‐phyric shergottites, NWA 2737 (chassignite), Shergotty...
Abstract In this work we discuss various selected mission concepts addressing Venus evolution through time. More specifically, address investigations and payload instrument supporting scientific goals open questions presented in the companion articles of volume. Also included are their related (observations & modeling) discussion which measurements future data products needed to better constrain Venus’ atmosphere, climate, surface, interior habitability A new fleet missions has been...
Abstract Water‐rich Martian regolith breccia Northwest Africa (NWA) 7034 was analyzed by Fourier transform infrared spectroscopy and transmission electron microscopy to determine the inventory phase distribution of H 2 O (used herein refer both molecular OH − structural components in hydrous minerals). Hydrous Fe oxide phases (hydromaghemite an unidentified nanocrystalline Fe‐bearing observed with hydromaghemite) phyllosilicates (saponite) were identified as primary mineralogic hosts for a...
Abstract Surface mineralogy records the primary composition, climate history and geochemical cycling between surface atmosphere. We have not yet directly measured on Venus in situ, but a variety of independent investigations yield basic understanding composition weathering reactions present era where rocks react under supercritical atmosphere dominated by CO 2 , N SO at ∼460 °C 92 bars. The volcanic plains that cover ∼80% is inferred to be basaltic, as 7 Venera Vega landers consistent with...
Abstract We report two experiments using 13 mineral and rock samples exposed to a complex synthetic Venus atmosphere composed of nine gases for durations 30 11 days conducted the NASA Glenn Extreme Environments Rig (GEER). Examination our run products scanning electron microscope equipped with an energy dispersive spectrometer reveals secondary minerals predominantly formed from reactions Fe Ca in solid sulfur atmospheric gas, results largely predicted literature, indicating that such...
The Importance of Venus Experimental Facilities Introduction: planet is the most Earth-like body in terms its size, composition, and location solar system, hosts some similar geologic processes, such as widespread basaltic volcanism aeolian sand transport [1,2].At same time, offers what likely greatest set technical challenges to exploration out all terrestrial bodies [3].With an average surface temperature ~460 ºC pressure ~92 bars (at mean planetary radius) [4], many types instrumentation,...