A5038497960- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- High-pressure geophysics and materials
- Hydrocarbon exploration and reservoir analysis
- Glass properties and applications
- Paleontology and Stratigraphy of Fossils
- Geological formations and processes
- Cryospheric studies and observations
- Marine and environmental studies
- Planetary Science and Exploration
- Geological and Geophysical Studies
- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Iron and Steelmaking Processes
- Geological Modeling and Analysis
- Soil and Unsaturated Flow
- Diamond and Carbon-based Materials Research
- Geochemistry and Elemental Analysis
- Geological and Tectonic Studies in Latin America
- Groundwater flow and contamination studies
- Climate change and permafrost
- Pleistocene-Era Hominins and Archaeology
- Zeolite Catalysis and Synthesis
Williams College
2023-2025
Woods Hole Oceanographic Institution
2021-2024
University of Oregon
2017-2022
Cascade (United States)
2021-2022
Pennsylvania State University
2014-2017
Los Alamos National Laboratory
2014
Subduction zones represent the interface between Earth’s interior (crust and mantle) exterior (atmosphere oceans), where carbon other volatile elements are actively cycled Earth reservoirs by plate tectonics. Helium is a sensitive tracer of sources can be used to deconvolute mantle crustal in arcs; however it not thought recycled into subduction processes. In contrast, readily recycled, mostly form carbon-rich sediments, thus understand delivery via subduction. Further, chemically-reactive...
Mantle-derived noble gases in volcanic are powerful tracers of terrestrial volatile evolution, as they contain mixtures both primordial (from Earth’s accretion) and secondary (e.g., radiogenic) isotope signals that characterize the composition deep Earth. However, emitted through subaerial hydrothermal systems also contributions from shallow reservoirs (groundwater, crust, atmosphere). Deconvolving source is critical for robust interpretations mantle-derived signals. Here, we use a novel...
Nitrogen plays a critical role in maintaining Earth's hospitable surface environment over geological time. Despite our atmosphere being dominated by nitrogen, understanding of how nitrogen was delivered to Earth and subsequent planetary processes modified budget through time is currently lacking. Here, we report measurements isotopologues N2 (Δ30), along with ultrahigh precision Ar, Kr, Xe isotopes, hydrothermal gas samples from Yellowstone National Park. We show that δ15N variations are...
Abstract Magma‐water interaction can dramatically influence the explosivity of volcanic eruptions. However, syn‐ and post‐eruptive diffusion external (non‐magmatic) water into glass remains poorly constrained may bias interpretation in juvenile products. Hydrogen isotopes ash from 2009 eruption Redoubt Volcano, Alaska, record syn‐eruptive hydration by vaporized glacial meltwater. Both aggregation occurred wettest regions plume, which resulted removal deposition most hydrated proximal areas...
Abstract Ocean basins are formed when continents broken apart. Adiabatic melt generation that is driven by rifting of continental lithosphere strongly dependent on the rate extension. Slow extension results in conductive heat loss from upwelling mantle, whereas cooling limited during fast and can result geotherm intersecting peridotite solidus. However, there few direct constraints rates mantle lithosphere. Here we use diffusion modeling subsolidus REE re‐equilibration between orthopyroxene...
Thríhnúkagígur Volcano, Iceland, is a composite spatter cone and lava field characteristic of basaltic fissure eruptions. Lava drainback at the end eruption left ~60 m evacuated conduit, 4 × 104 m3 cave formed by erosion unconsolidated tephra feeder dike. Field relationships within shallow plumbing system provide three-dimensional insight into conduit formation in systems. Petrographic estimates relative volumes erupted lavas both indicate xenolithic comprises 5–10 % volume, which cannot be...
Abstract Nitrogen (N) dominates Earth's atmosphere (78% N 2 ) but occurs in trace abundances silicate minerals, making it a sensitive tracer of recycled surface materials into the mantle. The mechanisms controlling transfer between terrestrial reservoirs remain uncertain because low mineral‐hosted fluid inclusions (FIs) are difficult to measure. Using new techniques, we analyzed and He isotope compositions olivine‐ pyroxene‐hosted FIs from arc volcanoes Southern Chile, Cascadia, Central...
The chemical and isotopic composition of the gases emitted by subduction zone volcanoes can provide insights into origin magmatic volatiles. In volcanic arcs, volatiles therefore be supplied from mantle, subducting slab, or rocks arc crust. Determining relative contributions these distinct sources is important for understanding transfer between Earth’s interior exterior reservoirs, which has implications physical evolution both mantle atmosphere. Each a different experiment in recycling...