A5076487276- Astro and Planetary Science
- High-pressure geophysics and materials
- Planetary Science and Exploration
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Spacecraft and Cryogenic Technologies
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Radioactive element chemistry and processing
- Marine and environmental studies
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- Astronomical and nuclear sciences
- Clay minerals and soil interactions
- Geochemistry and Geologic Mapping
- Mineralogy and Gemology Studies
- Lanthanide and Transition Metal Complexes
- Archaeology and ancient environmental studies
- Iron oxide chemistry and applications
- Chemical Thermodynamics and Molecular Structure
- Geochemistry and Elemental Analysis
University of New Mexico
2016-2025
New Mexico Heart Institute
2023
Planetary Science Institute
2022
University of Washington
2006
Jet Propulsion Laboratory
2006
Johnson Space Center
2006
Brookhaven National Laboratory
2006
University of California, Berkeley
2006
United States Naval Research Laboratory
2006
Campus France
2006
The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study. preliminary examination these samples shows that the nonvolatile portion is an unequilibrated assortment materials have both presolar solar system origin. contains abundance silicate grains are much larger than predictions interstellar grain models, many high-temperature minerals appear formed in inner regions nebula. Their presence a proves formation included...
The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by Stardust spacecraft appear be weakly constructed mixtures nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, metal, and accessory phases. very wide range olivine low-Ca pyroxene compositions in requires a formation conditions, probably reflecting different locations protoplanetary disk. restricted compositional ranges for absence hydrous phases...
Abstract— Ordinary and carbonaceous chondrites of the lowest petrologic types were surveyed by X‐ray mapping techniques. A variety metamorphic effects noted subjected to detailed analysis using electron microprobe, scanning microscopy (SEM), transmission (TEM), cathodoluminescence (CL) methods. The distribution Cr in FeO‐rich olivine systematically changes as metamorphism increases between type 3.0 3.2. Igneous zoning patterns are replaced complex ones Cr‐rich coatings develop on all grains....
Samples of the carbonaceous asteroid Ryugu were brought to Earth by Hayabusa2 spacecraft. We analyzed 17 samples measuring 1 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent formed in outer Solar System. The contain low abundances materials at high temperatures, such as chondrules and calcium- aluminum-rich inclusions. rich phyllosilicates carbonates, which through aqueous alteration reactions temperature, pH,...
Research Article| January 01, 2008 Oxygen Isotopes of Chondritic Components Hisayoshi Yurimoto; Yurimoto Department Natural History Sciences, Isotope Imaging Laboratory CRIS, Hokkaido University, Sapporo 060-0810, Japan, yuri@ep.sci.hokudai.ac.jp Search for other works by this author on: GSW Google Scholar Alexander N. Krot; Krot Hawai'i Institute Geophysics and Planetology, School Ocean Earth Science Technology, University at Manoa, Honolulu, 96822, U.S.A. Byeon-Gak Choi; Choi Seoul...
The chemical interactions of U and co-occurring metals in abandoned mine wastes a Native American community northeastern Arizona were investigated using spectroscopy, microscopy aqueous chemistry. concentrations (67-169 μg L(-1)) spring water samples exceed the EPA maximum contaminant limit 30 L(-1). Elevated (6,614 mg kg(-1)), V (15,814 As (40 kg(-1)) detected waste solids. Spectroscopy (XPS XANES) solid analyses identified (VI), (-I III) Fe (II, III). Linear correlations for release vs...
This paper reports the successful synthesis of true two-dimensional silicon carbide using a top-down approach. Theoretical studies have predicted that 2D SiC has stable planar structure and is direct band gap semiconducting material. Experimentally, however, growth challenged scientists for decades because bulk not van der Waals layered Adjacent atoms bond together via covalent sp3 hybridization, which much stronger than bonding in materials. Additionally, exists more 250 polytypes, further...
Abstract— We present the first detailed study of a population texturally distinct chondrules previously described by Kurat (1969), Christophe Michel‐Lévy (1976), and Skinner et al. (1989) that are sharply depleted in alkalis Al their outer portions. These “bleached” chondrules, which exclusively radial pyroxene cryptocrystalline texture, have porous zones where mesostasis has been lost. Bleached all type 3 ordinary chondrites lower abundances types 4–6. They most abundant L LL groups,...
The stoichiometry of titanomagnetite spinel in the martian basaltic meteorites is assessed using quantitative analysis oxygen measured by electron microprobe and energy loss spectroscopy transmission microscope. spinels are stoichiometric within errors techniques, enabling calculation fugacity with confidence. calculated Ghiorso-Sack Ca-QUIlF models, which also yield estimates temperature. basalts increases from 3 log units below QFM buffer for QUE 94201 to - 1.8 EETA 79001 (both...
Magnetite crystals produced by terrestrial magnetotactic bacterium MV-1 are elongated on a [111] crystallographic axis, in so-called "truncated hexa-octahedral" shape. This morphology has been proposed to constitute biomarker (i.e., formed only biogenic processes). A subpopulation of magnetite associated with carbonate globules Martian meteorite ALH84001 is reported have this morphology, and the observation taken as evidence for biological activity Mars. In study, we present exclusively...