A5013825621- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- High-pressure geophysics and materials
- Paleontology and Stratigraphy of Fossils
- Calcium Carbonate Crystallization and Inhibition
- earthquake and tectonic studies
- Groundwater and Isotope Geochemistry
- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Radioactive element chemistry and processing
- Crystallization and Solubility Studies
- Marine Biology and Ecology Research
- Planetary Science and Exploration
- Marine and coastal ecosystems
- Mineralogy and Gemology Studies
- Glass properties and applications
- Sports, Gender, and Society
- Clay minerals and soil interactions
- Building materials and conservation
- Chemical Synthesis and Characterization
- Sport and Mega-Event Impacts
- Astro and Planetary Science
Mississippi State University
2017-2025
University of Oregon
2015-2024
Louisiana Department of Natural Resources
2024
Cornell University
2007-2024
Tsinghua University
2023
Tusculum College
2019-2021
Cascade (United States)
2017-2020
Michigan Department of Natural Resources
2018
Pellissippi State Community College
2017
Centers for Disease Control and Prevention
2016
Research Article| January 01, 2017 Non-Traditional Stable Isotopes: Retrospective and Prospective Fang-Zhen Teng; Teng Isotope Laboratory, Department of Earth Space Sciences, University Washington, Seattle WA 98195, USA, fteng@uwashington.edu Search for other works by this author on: GSW Google Scholar Nicolas Dauphas; Dauphas Origins Lab, the Geophysical Sciences Enrico Fermi Institute, The Chicago, Chicago IL 60637, dauphas@uchicago.edu James M. Watkins Oregon, Eugene OR 97403,...
We assess the utility of four species living planktonic foraminifera as tracers thermocline and intermediate water masses in northern Pacific Ocean, based on their water-column distribution shell isotopic composition. Assuming oxygen equilibria with column, we infer apparent calcification depths. This allows an estimate carbon disequilibria. then relax assumption equilibrium to examine habitat effects kinetic disequilibrium processes. In California Current, left-coiling Neogloboquadrina...
Research Article| January 01, 2017 Kinetic Fractionation of Non-Traditional Stable Isotopes by Diffusion and Crystal Growth Reactions James M. Watkins; Watkins Department Geological Sciences University Oregon Eugene, OR USA, watkins4@uoregon.edu Search for other works this author on: GSW Google Scholar Donald J. DePaolo; DePaolo Earth Division Lawrence Berkeley National Laboratory Berkeley, CA Planetary Science California DJDepaolo@lbl.gov E. Bruce Watson Geology Rensselaer Polytechnic...
The ranges in intensity and style of volcanic eruptions, from highly explosive Plinian eruptions to quiescent lava extrusions, depend on the efficiency gas loss ascending magma. Obsidian pyroclasts – small, glassy pieces quenched magma found some tephra beds may preserve valuable information about degassing their vesicle textures volatile contents. Accurate interpretation volatiles, however, requires understanding mechanism formation pyroclasts. ca. 1325–1350 C.E. North Mono eruption Craters...
Important clues to the initiation and early behavior of large (super-) eruptions lie in records degassing during magma ascent. Here we investigate timescales ascent for three rhyolitic supereruptions that show field evidence contrasting at eruption onset: (1) 650 km3, 0.767 Ma Bishop Tuff, Long Valley; (2) 530 25.4 ka Oruanui eruption, Taupo; (3) 2500 2.08 Huckleberry Ridge Yellowstone. During ascent, decompression causes volatile exsolution from host melt into bubbles, leading H2O CO2...
Abstract Most Earth surface carbonates precipitate out of isotopic equilibrium with their host solution, complicating the use stable isotopes in paleoenvironment reconstructions. Disequilibrium can arise from exchange reactions DIC‐H 2 O system as well during crystal growth DIC‐CaCO 3 system. Existing models account for kinetic isotope effects (KIEs) these systems separately but have yet to be combined a general framework. Here, an open‐system box model is developed describing disequilibrium...
Significance Timescale estimates for crystal growth in volcanic systems, which are generally much shorter than absolute ages, thought to be shortest mafic (vs. silicic) systems. However, this result may influenced by assumptions rates and/or methodological biases. We show that Ca isotopes can used constrain systems and confirm large kinetic isotope effects arise during plagioclase crystallization natural phenocrystic, orbicular, experimental samples. Combined with crystal-size distribution...