A5004979063- Geological and Geochemical Analysis
- Fish Ecology and Management Studies
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Groundwater and Isotope Geochemistry
- Geochemistry and Geologic Mapping
- Marine and fisheries research
- High-pressure geophysics and materials
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Field-Flow Fractionation Techniques
- Paleontology and Stratigraphy of Fossils
- Iron and Steelmaking Processes
- Water Quality and Resources Studies
- Geomagnetism and Paleomagnetism Studies
- Fish Biology and Ecology Studies
- Radioactive element chemistry and processing
- Geological Studies and Exploration
- Analytical chemistry methods development
- Chromium effects and bioremediation
- Geochemistry and Elemental Analysis
- Fish biology, ecology, and behavior
- Aquatic Invertebrate Ecology and Behavior
- Forensic and Genetic Research
University of California, Davis
2011-2023
NOAA National Marine Fisheries Service Southwest Fisheries Science Center
2018
National Oceanic and Atmospheric Administration
2018
NOAA National Marine Fisheries Service
2018
Planetary Science Institute
2018
University of Illinois Urbana-Champaign
2008-2014
University of British Columbia
2013
We present a concerted international effort to cross‐calibrate five synthetic Th isotope reference materials (UCSC “A”, OU “U”, WUN, IRMM‐35 and IRMM‐36), six rock TML, Icelandic ATHO, USGS BCR‐2, W‐2, BHVO‐2, LV18) using multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS). then compare our new values with compilation of literature mass spectrometric data for these derive recommended “consensus” 230 Th/ 232 each. also dilution U concentration four W‐2).
We constrain the physical nature of magma reservoir and mechanisms rhyolite generation at Yellowstone caldera via detailed characterization zircon sanidine crystals hosted in three rhyolites erupted during ( c . 170–70 ka) Central Plateau Member eruptive episode—the most recent post-caldera magmatism Yellowstone. present 238 U– 230 Th crystallization ages trace-element compositions interiors surfaces (i.e. unpolished rims) single from each rhyolite. compare these data with bulk separates...
Research Article| July 01, 2009 Variations in 238U/235U uranium ore deposits: Isotopic signatures of the U reduction process? Charles John Bopp, IV; IV 1University Illinois at Urbana-Champaign, Department Geology, 245 Natural History Building, 1301 West Green Street, Urbana, 61801, USA Search for other works by this author on: GSW Google Scholar Craig C. Lundstrom; Lundstrom Thomas M. Johnson; Johnson Justin J.G. Glessner Author and Article Information Publisher: Geological Society America...
The loss of genetic and life history diversity has been documented across many taxonomic groups, is considered a leading cause increased extinction risk. Juvenile salmon leave their natal rivers at different sizes, ages times the year, it thought that this variation contributes to population sustainability, thus central recovery efforts. However, in order preserve restore traits, necessary first understand how environmental factors affect expression success. We used otolith 87Sr/86Sr adult...
Rainbow trout (Oncorhynchus mykiss) have diverse life histories, including both freshwater-resident and anadromous “steelhead” life-history forms. Here, we demonstrate that female resident rainbow produce offspring survive return to spawn as adult steelhead. This study represents the first successful attempt quantify steelhead production rates from across a large watershed. Otolith microchemistry ( 87 Sr/ 86 Sr) techniques were used determine maternal history (resident or anadromous) of 498...
Abstract Hydrothermal vent fields located in the gap between known sites Guaymas Basin and 21°N on East Pacific Rise were discovered Alarcón southern Pescadero Basin. The spreading segment was mapped at 1‐m resolution by an autonomous underwater vehicle. Individual chimneys identified using bathymetric data. Vent interpreted as active from temperature anomalies water column data observed sampled during remotely operated vehicle dives. Ja Sít, Pericú, Meyibó are near eruptive fissure of...
Fall-run Chinook salmon (Oncorhynchus tshawytscha) from the Sacramento–San Joaquin River system form backbone of California’s fishery and are heavily subsidized through hatchery production. Identifying temporal trends in relative contribution hatchery- versus wild-spawned is vital for assessing status resiliency wild populations. Here, we reconstructed proportion fish on natural spawning grounds Feather River, a major tributary to Sacramento using strontium isotope ( 87 Sr/ 86 Sr) ratios...
Reduction of toxic Cr(VI) to less Cr(III) is an important process for attenuating transport in groundwater. This results immobilization chromium as and effectively decreases the overall mobility inventory. During both abiotic biotic reduction Cr(III), a kinetic isotope effect occurs which lighter isotope, 52Cr, reacts preferentially, leaving remaining dissolved enriched heavier 53Cr. Cr isotopes have proven be useful tool estimating magnitude determining where hydrologic system occurring. In...
Strontium isotope ratios ( 87 Sr/ 86 Sr) in otoliths are a well-established tool to determine origins and movement patterns of fish. However, otolith extraction requires sacrificing fish, when working with protected or endangered species, the use nonlethal samples such as scales, spines, fin rays is preferred. Unlike that predominantly aragonite, these tissues composed biological apatite. Laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) analysis...
The IsoFishR application is a data reduction and analysis tool for laser-ablation strontium isotope data, following common best practices providing reliable reproducible results. Strontium ratios (87Sr/86Sr) are powerful geochemical tracer commonly applied in wide range of scientific fields inductively coupled mass spectrometry considered the method choice to obtain spatially resolved 87Sr/86Sr from variety sample materials. However, analyses methods variable between different research...
Abstract The objective of this study was to validate the use fin ray strontium isotope ratios ( 87 Sr: 86 Sr) via laser ablation (LA) resolve fine‐scale movement patterns in sturgeons (Acipenseridae) during freshwater rearing early life stages. We conducted a laboratory experiment which juvenile White Sturgeon Acipenser transmontanus were exposed two water sources exhibiting distinctive Sr values (American River and Putah Creek, California) over weekly time periods understand how exposure...
ABSTRACT Objectives Analysis of a mass burial seven males at CA‐ALA‐554, prehistoric site in the Amador Valley, CA, was undertaken to determine if individuals were “locals” or “non‐locals,” and how they genetically related one another. Methods The study includes osteological, genetic (mtDNA), stable (C, N, O, S) radiogenic (Sr) isotope analyses bone tooth (first third molars) samples. Results Isotopes first molars, show spent majority their lives living together. They are not locals but...
Abstract Populations of Chinook Salmon Oncorhynchus tshawytscha in California are decline due to the combined effects habitat degradation, water diversions, and climate change. Reduced life history diversity within these populations inhibits their ability respond stressors. Putah Creek, a small creek California’s Central Valley that once supported Salmon, is undergoing restoration provide spawning habitats for this imperiled species. Beginning 2014, increasing numbers spawned throughout...
Abstract Glacially buried paleosols of pre‐Holocene age were evaluated as potential sources for anomalously large concentrations ammonium in groundwater East Central Illinois. Ammonium has been detected at that are problematic to water treatment facilities (greater than 2.0 mg/L) this region. Paleosols characterized study Quaternary age, specifically Robein Silt samples. Paleosol samples displayed significant capacity both store and release through experiments measuring processes sorption,...
Abstract Circulation of seawater at oceanic spreading centers extracts heat, drives rock alteration, and transports leached metals to shallower levels the crust, where they may precipitate form ore deposits. Crystallization lower exsolve introduce magmatic volatiles into seawater-dominant system. However, role added hydrothermal system, including pathways these fluids are lesser known. Here we present coupled in-situ strontium isotope rare earth element data distinct domains in epidote, a...
Conodont microfossils record seawater strontium isotope values (87Sr/86Sr), permitting chemostratigraphic correlation for tectonic and climatic reconstructions of the Paleozoic early Mesozoic (541–201 Ma). Laser ablation multiple collection inductively coupled plasma mass spectrometry (LA MC-ICP-MS) can provide rapid, high spatial resolution 87Sr/86Sr analysis conodont bioapatite but has not been validated by comparison with solution analysis. Validation LA MC-ICP-MS should be completed in...
Abstract The Skaergaard intrusion is one of the most thoroughly studied layered mafic intrusions on Earth and an exceptional example (near) closed-system magmatic differentiation. We report new Fe isotope data for whole rocks, magnetite ilmenite separates through series (LS) upper border (UBS) intrusion. δ56Fe values gabbroic rocks range from 0.033‰ to 0.151‰ with abrupt step increase at base Lower Zone c (LZc) within LS appearance cumulus subsequent decline accompanying FeTi oxide...