A5032886963- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Nuclear Physics and Applications
- Archaeology and ancient environmental studies
- Mineralogy and Gemology Studies
- Metallurgical Processes and Thermodynamics
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Paleontology and Stratigraphy of Fossils
- Geological Modeling and Analysis
- Garlic and Onion Studies
- Metal and Thin Film Mechanics
- Diverse Educational Innovations Studies
- Lichen and fungal ecology
- Engineering and Information Technology
- Hydrology and Sediment Transport Processes
- Welding Techniques and Residual Stresses
- Image Processing and 3D Reconstruction
- Iron and Steelmaking Processes
- Seismic Imaging and Inversion Techniques
- Historical and Archaeological Studies
Western Washington University
2020-2024
University of California, Riverside
2023
University of Edinburgh
2016-2023
Middlebury College
2017-2021
University of Oregon
2014-2019
Volatile elements (water, carbon, nitrogen, sulfur, halogens, and noble gases) played an essential role in the secular evolution of solid Earth emergence life. Here we provide overview Earth's volatile inventories describe mechanisms by which volatiles are conveyed between surface mantle reservoirs, via subduction volcanism. Using literature data, compute concentration flux estimates for major reservoirs internally balanced assessment modern global recycling. a nitrogen isotope box model,...
Abstract Volatile and stable isotope data provide tests of mantle processes that give rise to heterogeneity. New on enriched mid‐oceanic ridge basalts (MORB) show a diversity components. Pacific PREMA‐type (H 2 O/Ce = 215 ± 30, δD SMOW −45 5 ‰) are similar those in the northern Atlantic 220 30; −30 −40 ‰). Basalts with EM‐type signatures have regionally variable volatile compositions. Northern wetter 330 30) isotopically heavier hydrogen (δD −57 than MORB. Southern damp 120 10) intermediate...
Phenocrysts in magmas are often assumed to be the product of crystallization directly from a host magma. However, decades research suggests that crystals carried (crystal cargo) far more complex. We test hypothesis textural and chemical characteristics phenocrysts (both native disaggregated crystal clots) andesitic dacitic lavas tephras can used develop models for spatial arrangement subcrustal magma systems their evolution over time. To do this, we use geochemical fingerprinting complex...
Arc basalts are oxidized relative to mid-ocean ridge basalts; however, the mechanism through which arc gain this elevated oxidative state is debated. This observation has been extended include Fe3+/∑Fe measurements from olivine-hosted melt inclusions enclosed in relatively Fo-rich olivines (i.e., have presumably trapped unevolved liquid compositions as inclusions). Experimental data suggest, that recorded by can diffusively equilibrate with host magma on short timescales, perhaps rapidly...
Abstract Recycling of material at subduction zones has fundamental implications for melt composition and mantle rheology. Ocean island basalts (OIBs) sample parts the from variable depths that have been diversely affected by zone processes materials, including subducted slab, metasomatising melts fluids. Resultant geochemical differences are preserved a variety scales inclusions to whole rocks, individual islands chains islands. Here we examine global dataset ocean basalt compositions with...
Abstract The compositional diversity of primitive arc basalts has long inspired questions regarding the drivers magmatism in subduction zones, including roles decompression melting, mantle heterogeneity, and amount composition slab‐derived materials. This contribution presents volatile (H 2 O, Cl, S), major, trace element compositions melt inclusions from basaltic magmas erupted at three volcanic centers Washington Cascades: Mount St. Helens (two tephras, 2.0–1.7 ka), Indian Heaven Volcanic...
Abstract Water controls magmatic crystallization and drives volcanic eruptions, but little is known about its primary source in silicic systems. The hydrogen isotope composition of products provides a metric that can track identify source, fractionation, or degassing processes. Despite such promise, measurements have never previously been acquired for undegassed melt. To explore whether isotopes the modification water magma reservoir, we analyzed D/H ratios dissolved H 2 O content...
Solution MC‐ICP‐MS is an established technique for high precision boron isotope measurement results (δ 11 B SRM 951 ) in carbonates, yet its application to silicate rocks has been limited. Impediments include volatilisation during dissolution and contamination chemical purification. To address this, we present a low‐blank sample preparation procedure that couples hydrofluoric acid‐digestion low‐temperature evaporation (mannitol‐free), following purification using B‐specific Amberlite IRA 743...
The compositional diversity of primitive arc basalts has long inspired questions regarding the drivers magmatism in subduction zones, including roles decompression melting, mantle heterogeneity, and amount compositions slab-derived materials. This contribution presents volatile (H2O, Cl, S), major, trace element melt inclusions from basaltic magmas erupted at three volcanic centers Washington Cascades: Mount St. Helens (two tephras, 2.0–1.7 ka), Indian Heaven Volcanic Field <600 ka...
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...