A5069707145- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Elemental Analysis
- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Mineralogy and Gemology Studies
- Antibiotic Use and Resistance
- High-pressure geophysics and materials
- Paleontology and Stratigraphy of Fossils
- Mineral Processing and Grinding
- Pneumonia and Respiratory Infections
- X-ray Spectroscopy and Fluorescence Analysis
- Gamma-ray bursts and supernovae
- Geological Studies and Exploration
- Cultural Heritage Materials Analysis
- Geomagnetism and Paleomagnetism Studies
- Sepsis Diagnosis and Treatment
- Water Quality and Resources Studies
- Clay minerals and soil interactions
- Building materials and conservation
- Geography Education and Pedagogy
- Mine drainage and remediation techniques
Texas Health Harris Methodist Hospital Fort Worth
2021-2025
University of Auckland
2020-2024
Macquarie University
2014-2022
The University of Western Australia
2013-2022
Australian Astronomical Observatory
2020-2022
United States Geological Survey
2010-2021
Denver Federal Center
2011-2020
Geology, Geophysics, and Geochemistry Science Center
2019
University of California, Davis
2019
University of California, Berkeley
2019
It is generally thought that the sulfate reduction metabolism ancient and would have been established well before Neoarchean. puzzling, therefore, sulfur isotope record of Neoarchean characterized by a signal atmospheric mass-independent chemistry rather than strong overprint reducers. Here, we present study four isotopes obtained using secondary ion MS seeks to reconcile number features seen in record. We suggest ocean basins had two coexisting, significantly sized pools pathways forming...
To evaluate whether anatectic and/or highly fractionated lithophile element-enriched rhyolite tuffs deposited in arid lacustrine basins lose enough lithium during eruption, lithification, and weathering to generate significant Li brine resources, pre-eruptive melt compositions, preserved inclusions, the magnitude of post-eruptive depletions, evident host rhyolites, were documented at six sites western United States. Each is a member bimodal basalt-rhyolite assemblage associated with...
The supergiant Obuasi gold deposit is the largest in Paleoproterozoic Birimian terranes of West Africa with 62 Moz (past production + resources).The hosted Kumasi Group sedimentary rocks composed carbonaceous phyllites, slates, psammites, and volcaniclastic intruded by different generations felsic dikes granites.A three-stage deformation history defined for district.The D1Ob stage weakly recorded as a layer-parallel fabric indicates that bedding parallel shearing occurred during early at...
The Hideaway Park tuff is the only preserved extrusive volcanic unit related to Red Mountain intrusive complex, which produced world-class Henderson porphyry Mo deposit. Located within Colorado Mineral Belt, USA, second largest Climax-type deposit in world, and therefore an excellent location investigate magmatic processes leading mineralization. We combine extensive dataset of major element, volatile, trace element abundances quartz-hosted melt inclusions pumice matrix glass with...
Abstract The minimum oxygen fugacity (fO2) of Earth’s upper mantle probably is controlled by metal saturation, as defined the iron-wüstite (IW) buffer reaction (FeO → Fe + O). However, widespread occurrence moissanite (SiC) in kimberlites, and a suite super-reduced minerals (SiC, alloys, native elements) peridotites Tibet Polar Urals (Russia), suggest that more reducing conditions (fO2 = 6–8 log units below IW) must occur locally mantle. We describe pockets melt trapped aggregates corundum...
Abstract Background Limited evidence exists on optimal dosing of daptomycin (DAP) in patients receiving intermittent dialysis (HD). Current labeling recommends every 48 hour (q48h) which often causes additional DAP doses to be given throughout the week when schedules become unaligned. Alternatively, current recommendations for thrice weekly suggest a larger dose 72-hour interdialytic interval, makes operationalization difficult within inpatient electronic systems. Methods A retrospective...
Abstract Background Despite 2019 ATS/IDSA CAP guideline support for a 5-day treatment duration, compliance with these recommendations remains suboptimal. Patients that receive extended courses of antibiotics are at increased risk adverse outcomes, longer hospitalization stays, and development antimicrobial resistance. The objective this study was to compare hospital length stay (LOS) therapy (LOT) before after pharmacist-driven automatic stop date protocol ceftriaxone COPD exacerbations....
Sulfides entering subduction zones can play an important role in the release of sulfur and metals to mantle wedge contribute formation volcanic arc-associated ores. Fractionation stable isotopes recorded by sulfides during metamorphism provide evidence fluid-rock interactions give insights on mobilization. A detailed microtextural geochemical study was performed mineralized samples from two ocean floor-related sulfide deposits (Servette Beth-Ghinivert) high-pressure units Italian Western...
[1] Melt inclusions trapped in phenocryst phases are important primarily due to their potential of preserving a significant proportion the diversity magma composition prior modification parent array during transport through crust. The goal this investigation was evaluate impact formational and post-entrapment processes on melt hosted high anorthite plagioclase MORB. Our observations from three ultra-phyric lavas Endeavor Segment Juan de Fuca Ridge document narrow range major elements...
Abstract Textural, geochronological, and geochemical data are presented here for cassiterite from the giant (149.7 million tonnes [Mt]) Mesoproterozoic Sullivan Pb-Zn-Ag deposit, which has been subjected to several tectonothermal events. These provide constraints on age origin of tin concentrations new insights into related base metal mineralization. is rare among sediment-hosted, stratiform deposits in having high contents ore (up 2.5 wt %; avg 310 ppm Sn). Cassiterite occurs all facies...
Abstract Tellurium-rich (Te) adularia-sericite epithermal Au-Ag deposits are an important current and future source of precious critical metals. However, the evolution ore-forming fluids in these masked by traditional bulk analysis quartz oxygen isotope ratios that homogenize fine-scale textures growth zones. To advance understanding Te metals, herein, we use petrographic cathodoluminescence (CL) images such zones to guide high spatial resolution secondary ion mass spectroscopy (SIMS)...
A mineral chemical study by electron microprobe microanalyser was carried out to decipher the origin of xenotime overgrowths from King Leopold Sandstone, Kimberley Group, NW Australia. Results show that Sandstone are characterised LREE depletion and MREE–HREE enrichment. The also higher Zr content lower U, Fe, Lu contents, suggestive hydrothermal rather than diagenetic origin, as previously claimed. intrusive contact relationships between Hart Dolerite Leopold, Warton Pentecost sandstones...
Microscale analysis of ferrous:ferric iron ratios in silicate minerals has the potential to constrain geological processes but proved challenging because textural information and spatial resolution are limited with bulk techniques, in-situ methods have resolution.Synchrotron methods, such as XANES, been hampered by sensitivity spectra crystal orientation matrix effects.In an attempt break this nexus, biotites from Tanzania were characterised a combination optical microscopy, electron microprobe,
Erionite, a fibrous zeolite, occurs in pediment gravel deposits near Killdeer Mountain, North Dakota. Material from these has been excavated for use as roadbed throughout Dunn County, Erionite also the Cappadocian region of Turkey, where link between malignant mesothelioma and inhalation this mineral established. The U.S. Environmental Protection Agency (EPA), Region 8, requested that Geological Survey (USGS) compare chemistry morphology erionite collected Mountains to those villages Turkey...
The Australian Astronomical Observatory's (AAO's) AESOP project is part of the Multi-Object Spectrograph Telescope (4MOST) system for VISTA telescope. It includes 2436-fibre positioner, space frame and electronics enclosures. concept role AAO in 4MOST have been described previous SPIE proceedings. final assembly stage has completed. In this paper, engineering principles applied during critical components testing instrument are discussed. major performance requirement that all 2436 science...
In this study, four randomly selected copper-bearing minerals were examined—azurite, malachite, bornite, and chalcopyrite. The objectives to examine enumerate the crystalline chemical properties of each minerals, determine which, if any, Cu-bearing might adversely affect systems biota, provide a multi-procedure reference. Laboratory work included use computational software for quantifying amorphous material optical electron imaging instruments model project structures. Chemical weathering,...
Management of equipment vibration will be a challenge for the upcoming generation extremely large telescopes (ELTs) (GMT, TMT, and ESO's ELT) is being dealt with proactively by all three projects. We document approaches, techniques, future efforts ELTs in their attempts to manage telescopes. detail approaches developing component requirements, characterizing sources, simulating telescope structural movements, mitigating source vibrations. illustrate iterative approach taken observatories...
Abstract Background The purpose of this study is to implement the PEN-FAST Penicillin Allergy Screening Tool in emergency department identify low risk patients with inappropriate penicillin-related allergies transition them a beta-lactam. Newly published, validated, penicillin allergy clinician decision tool (PEN-FAST) allows healthcare providers negative predictive value 96%. This quick, five question clinical and antimicrobial stewardship programs who would also test if formal was...