A5046965320- Astro and Planetary Science
- Planetary Science and Exploration
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Space Exploration and Technology
- Geophysics and Sensor Technology
- History of Science and Medicine
- Radioactivity and Radon Measurements
- Cryospheric studies and observations
- Landslides and related hazards
- Geochemistry and Geologic Mapping
- Inertial Sensor and Navigation
- Crystal Structures and Properties
- Isotope Analysis in Ecology
- Aerodynamics and Acoustics in Jet Flows
- Historical Astronomy and Related Studies
- Nuclear Physics and Applications
- Combustion and flame dynamics
- Marine and environmental studies
- Ancient Near East History
- Geological Studies and Exploration
- Archaeology and ancient environmental studies
- Advanced X-ray and CT Imaging
- Spacecraft and Cryogenic Technologies
Macau University of Science and Technology
2021-2024
University of Arizona
2014-2022
Solar System Exploration Research Virtual Institute
2014-2022
China National Space Administration
2021-2022
Purdue University West Lafayette
2021
Ames Research Center
2019
University of Minnesota
2011
Abstract We use a combination of 2D and 3D petrographic examination 40 Ar‐ 39 Ar analyses to examine the impact histories suite seven ordinary chondrites (Baszkówka, Miller, NWA 2380, Mount Tazerzait, Sahara 98034, Tjerebon, MIL 99301) that partially preserve their ancient, but postaccretionary, porosity ranging from 10 20%. whether materials seem be only mildly processed (as large intergranular pore spaces suggest) may have more complex shock histories. The ages determined for most OC s...
Abstract The diverse microstructures of Fe‐Ni metal in 10 L groups ordinary chondrites that experienced progressive shock alteration were investigated using the electron backscattered diffraction technique. Through a combination metallography and silicate‐based classification scheme, we established metamorphic features phases corresponding to particular impact stages. In weakly shocked (S1–S2), interlaced Neumann bands occur polycrystalline kamacite, resulting from multiple small events on...
Abstract In a histogram of lunar impact ages from the Apollo 16 site, there is spike circa 3.9 Ga that has been interpreted to represent either large number nearly synchronous events or an abundance samples were affected slightly differently by event produced Imbrium basin. To further scrutinize those age relationships, we extracted six centimeter‐sized clasts melt ancient regolith breccia 60016 and performed petrological geochronological ( 40 Ar‐ 39 Ar) analyses. Three have similar...
Abstract We use cosmic‐ray exposure ( CRE ) ages of ureilites, combined with magnesium numbers olivine, and oxygen isotopes, to search for evidence specific source events initiating groups ureilites. This technique can also be used investigate the heterogeneity body from which samples were derived. There are a total 39 ureilites included in our work, represents largest collection ureilite age data date. Although we find some possible clusters, it is clear that most did not originate one or...
Abstract The microstructure of plessite, which is composed kamacite ( α ) and taenite γ ), exhibits diverse formation mechanisms highly complex. In this study, four types namely net, acicular, duplex, pearlitic were investigated in L group chondrites using the Electron Backscatter Diffraction (EBSD) technique. This enabled comprehensive determination their orientation relationships, evolution paths, mechanisms. findings from study demonstrate that net plessite formed due to shock reheating...
Abstract Mesosiderites are thought to be created by a catastrophic impact that mixes the silicate crust with metallic core of differentiated asteroid(s). The metal‐silicate mixing event greatly affects subsequent geological evolution mesosiderite parent body. To gain better understanding this event, we carried out studies on olivine alteration and merrillite Pb‐Pb thermochronology in Dong Ujimqin Qi mesosiderite. primary meteorite has been altered through sulfidation reactions, leading...
Abstract The LL5 chondrite Chelyabinsk has had numerous isotopic studies since its fall in 2013. These data have been used to suggest ~8 impact events recorded from multiple systems (e.g., Ar‐Ar, U–Pb, Sm‐Nd, Rb‐Sr, among others). We report details of Ar‐Ar and U‐Pb results re‐evaluate the geochronology Chelyabinsk. Argon youngest age meteorites, 25 ± 11 Ma, an older resetting event at ~2550 Ma. analysis upper concordia 4456 23 Ma a lower 184 200 intercept represents later thermal impact),...
Abstract Can fractal analysis of a lava flow's margin enable classification the lava's morphologic type (e.g., pāhoehoe)? Such classifications would provide insights into rheology and dynamics flow when it was emplaced. The potential to classify flows from remotely‐sensed data particularly benefit that are inaccessible, including on other planetary bodies. technique's current interpretive framework depends three assumptions: (1) measured fractality is scale‐invariant; (2) types can be...