A5069047599- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Soil Moisture and Remote Sensing
- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Mineralogy and Gemology Studies
- Water Quality Monitoring Technologies
- Clay minerals and soil interactions
- GNSS positioning and interference
- Orthopaedic implants and arthroplasty
- Radioactive element chemistry and processing
- Astro and Planetary Science
- Indoor and Outdoor Localization Technologies
- Seismology and Earthquake Studies
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Total Knee Arthroplasty Outcomes
- Orthopedic Infections and Treatments
- Water Quality and Resources Studies
- Crystal Structures and Properties
- Thermal Expansion and Ionic Conductivity
McGill University
2010-2024
United States Geological Survey
2009
Earth and Space Research
2009
New Mexico Institute of Mining and Technology
2009
University of Washington
2009
Université du Québec à Montréal
2008
University of Oklahoma
2007
Marymount University
2007
Geophysical Laboratory
1998-2005
Carnegie Institution for Science
2004-2005
We have determined the postspinel transformation boundary in Mg 2 SiO 4 by combining quench technique with situ pressure measurements, using multiple internal standards including Au, MgO, and Pt. The experimentally is general agreement previous measurements which Au scale of Anderson et al. [1989] was used to calculate pressure: Using this scale, it occurs at significantly lower pressures compared that corresponding 660‐km seismic discontinuity. In study, we also report new experimental data...
Seismic background noise dramatically decreased as a result of lockdown measures in place for mitigating the spread COVID-19.
Background: Metal ion toxicity, metal hypersensitivity, and carcinogenicity are causes for concern patients with metal-on-metal hip replacements. Thus, understanding the biological fate of ions, consequently their long-term systemic effects, is great interest to surgeons alike. Methods: Inductively coupled plasma mass spectrometry was used measure levels cobalt, chromium, molybdenum ions in blood control (preoperative pre-resurfacing patients), a metal-on-polyethylene total prosthesis,...
Small volume fractions of metal-rich, iron-nickel-sulfur-oxygen melt do not form an interconnected network in polycrystalline olivine at pressures up to 11 gigapascals. These results suggest that iron-rich melts could have migrated downward along grain edges Earth's core. Core separation below gigapascals within planetary bodies must been facilitated by large degrees partial melting, resulting either immiscible silicate and metal-sulfide or extraction the concentrate metallic remainder.
The Valles Caldera complex in north–central New Mexico, USA, represents the type example of a resurgent caldera system, characterized by eruption two voluminous high-silica rhyolite ignimbrites, Otowi and Tshirege Members Bandelier Tuff. Central resurgence ∼1000 m occurred within 27 ± kyr following Tshirege, or Upper Tuff (UBT). This process was accompanied small-volume eruptions Deer Canyon Rhyolite, followed closely Redondo Creek Rhyodacite. Cerro del Medio Rhyolite lava dome is product...
Abstract Global Navigation Satellite System Interferometric Reflectometry (GNSS‐IR) using low‐cost antennas is a practical solution for monitoring water levels from rivers, lakes and seas that does not require submerging any instruments in water. Here we present novel method obtaining real‐time multiple validate by comparing with measurements co‐located pressure gauge at two sites variable tides. Additionally, use survey to show there site‐dependant mean bias GNSS‐IR up few centimeters, but...
The relative interfacial energies of immiscible carbonate and silicate melts were investigate in olivine clinopyroxene matrices. Carbonate melt has a higher melt–solid energy than does the coexisting melt. therefore selectively wets grain-edge channels between solid phases, excluding to center pockets, away from grain edges. This prevents migrating independently silicat is unable separate solid-dominated assemblage. will migrate effectively only after solidified or by separating within...
Abstract. We have developed a ground-based Global Navigation Satellite System Reflectometry (GNSS-R) technique for monitoring water levels with comparable precision to standard tide gauges (e.g. pressure transducers) but at fraction of the cost and using commercial products that are straightforward assemble. As opposed geodetic-standard antennas been used in previous GNSS-R literature, we use multiple co-located low-cost retrieve via inverse modelling signal-to-noise ratio data. The...
The rhyolitic Valles caldera complex, New Mexico, is one of the type examples resurgent calderas and has experienced two well‐studied caldera‐forming eruptions. first formed Lower Bandelier Tuff (LBT) at 1.61 Ma, second emplaced Upper (UBT) 1.22–1.26 Ma. During time between LBT UBT, much smaller‐scale Cerro Toledo Rhyolite (CTR) was sporadically erupted. Quartz crystals from these stages activity were imaged with cathodoluminescence microscopy, growth zones in certain quartzes, due to...
Recent alkaline basalts have brought xenoliths of the underlying lithospheric mantle to surface at more than 20 localities along strike length Canadian Cordillera. The populations 13 these xenolith suites display a common mode 39–40 wt.% MgO and 3.0–3.5.0 Al 2 O 3 , corresponding relatively fertile lherzolite whose composition could reflect 8%–10% melting primitive mantle. present oxidation state Cordillera obtained from olivine–spinel equilibria is ∼1 log unit below...