A5000623627- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Electron and X-Ray Spectroscopy Techniques
- Glass properties and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Hydrocarbon exploration and reservoir analysis
- Advanced Materials Characterization Techniques
- Nuclear materials and radiation effects
- Astro and Planetary Science
- Mineralogy and Gemology Studies
- Methane Hydrates and Related Phenomena
- Inorganic Fluorides and Related Compounds
- Extraction and Separation Processes
- Iron oxide chemistry and applications
- Cultural Heritage Materials Analysis
- Geochemistry and Elemental Analysis
- Planetary Science and Exploration
- Ion-surface interactions and analysis
- Intermetallics and Advanced Alloy Properties
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Radioactive element chemistry and processing
University of Michigan–Ann Arbor
2018-2023
Michigan United
2020-2021
Washington State University
2015-2019
Australian National University
2019
Marine Scotland
2014
University of Alaska Fairbanks
2010-2013
Alaska Volcano Observatory
2012
University of Hawaiʻi at Mānoa
2010
The University of Sydney
1989
National Institute for Minamata Disease
1989
Rare earth mineralization in the Bear Lodge alkaline complex (BLAC) is mainly associated with an anastomosing network of carbonatite dikes and veins, their oxidized equivalents. carbonatites are LREE-dominant, some peripheral zones enriched HREEs. We describe unique chemistry mineralogy one such zone, Cole HFSE(+HREE) Occurrence (CHO), located ~2 km from main intrusions. The CHO consists anatase, xenotime-(Y), brockite, fluorite, zircon, K-feldspar, contains up to 44.88% TiO2, 3.12% Nb2O5,...
Mapping and sampling of 18 eruptive units in two study areas along the Galápagos Spreading Center (GSC) provide insight into how magma supply affects mid‐ocean ridge (MOR) volcanic eruptions. The have similar spreading rates (53 versus 55 mm/yr), but differ by 30% time‐averaged rate (0.3 × 10 6 0.4 m 3 /yr/km). Detailed geologic maps each area incorporate observations flow contacts sediment thickness, addition to sample petrology, geomagnetic paleointensity, inferences from high‐resolution...
Direct and remote measurements of volcanic gas composition, SO2 flux, eruptive mass from Bezymianny Volcano were acquired between July 2007 2010. Chemical composition fumarolic gases, plume flux ground air-based ultraviolet sensing (FLYSPEC), Ozone Monitoring Instrument (OMI) satellite observations used along with eruption timing to elucidate magma processes subsurface conditions, constrain total volatile flux. had five explosive magmatic eruptions May June The most complete datasets for the...
Twenty-four internally heated pressure vessel experiments were conducted at 810–860°C, 1·5–4·05 kbar, and oxygen fugacities (fO2) = NNO –0·5 to +2 log units (where is the nickel–nickel oxide buffer), using hydrous rhyodacitic starting glasses from Mt Usu, Japan. Aqueous solutions added experimental charges such that volatile phase(s) coexisting with crystalline phases (amphibole, plagioclase, clinopyroxene) run conditions buffered F, Cl, S, CO2 concentrations in melt. The resultant...
Abstract While much progress has been made in electron-probe microanalysis (EPMA) to improve the accuracy of point analysis, same level attention not always applied quantification wavelength-dispersive spectrometry (WDS) X-ray intensity maps at individual pixel level. We demonstrate that rigor traditional analysis can also be pixels maps, along with additional acquisition and quantitative processing procedures further accuracy, precision, mapping throughput. Accordingly, map should include...
The crystal-melt partitioning behaviour of a suite trace and economically important elements—Li, Sc, V, Mn, Ni, Cu, Zn, Ga, Rb, Sr, Y, Zr, Nb, Mo, Sn, Ba, Hf, W Pb—has been investigated experimentally under fluid-saturated conditions for rhyodacitic melts from natural volcanic sample Mt. Usu, Japan. Homogeneous starting glasses were doped with some these elements, aqueous solutions buffered the F Cl concentrations in coexisting fluids. elements between amphibole, plagioclase, clinopyroxene...
Nepheline crystallizes upon slow-cooling in some melts concentrated Na2O and Al2O3, which can result a residual glass phase of low chemical durability. incorporate many components often found high-level waste radioactive borosilicate glass, including network ions (e.g., Si, Al, Fe), alkali metals Cs, K, Na, possibly Li), alkaline-earth Ba, Sr,Ca, Mg), transition Mn, Cr, Zn, Ni). When crystallized from different compositions, nepheline composition varies as function starting melt composition....
Abstract Many rhyolites contain quartz crystals with relatively Ti-rich rims and Ti-poor cores, a sharp interface between zones, attributed to partial dissolution followed by overgrowth following heating event due mafic recharge of the system. Quartz in compositionally zoned, high-silica rhyolite Tshirege Member Bandelier Tuff erupted at 1.26 Ma from Valles caldera, New Mexico, show range zoning styles becoming more abundant upward ignimbrite sheet among progressively less evolved magma...
Research Article| October 02, 2017 Sulfur release from main-phase Columbia River Basalt eruptions Klarissa N. Davis; Davis 1School of the Environment, Washington State University, Pullman, 99164, USA Search for other works by this author on: GSW Google Scholar John A. Wolff; Wolff Michael C. Rowe; Rowe 2School University Auckland, Auckland 1010, New Zealand Owen K. Neill Author and Article Information Publisher: Geological Society America Received: 01 Jun Revision 11 Aug Accepted: 18 First...
The August 7-8, 2008, eruption of Kasatochi Island volcano, located in the central Aleutians Islands, Alaska, produced abundant, compositionally heterogeneous basaltic andesite (52-55 wt% SiO2) that has been interpreted to result from pre-eruptive magma mixing. contains two populations plagioclase phenocrysts. first, volumetrically dominant population consists oscillatory-zoned phenocrysts with an overall normal zonation trend toward comparatively sodic rims (An55-65), interrupted by...
This study presents chemical and mineralogical data on weathering trends in a saprolite that is preserved between flows of the Columbia River Basalt Group at Trinidad, Washington. Bulk chemistry, electron imaging, X-ray mapping indicate early Fe Mg depletion by dissolution ferromagnesian minerals, followed alkalis, Al, Ti, P corresponds to feldspars, titanomagnetite, apatite. Secondary coatings nontronite clay deep display intricate, submicrometer-scale zoning content. Distinct aluminous...
Resting eggs are important phases in the life strategy of many coastal and estuarine copepods. The egg mortality sediment layers where they buried, as well re-suspension from into water column may hatch factors that affect success this strategy. Considering fishing effort some areas is high trawling leads to bottom sediments, it understand these effects on biology organisms utilize habitats part their cycle. This study examined hatching copepod resting wake two different demersal gear...
MINERAL (MINeral ERror AnaLysis) is a MATLAB^(R) based program that performs mineral formula recalculations and calculates the error on unit cations though propagation of analytical uncertainties. The focused 9 common groups. Other minerals are accommodated through generic routine in which users designate number oxygens desired formula. Additional functionalities provide with range appropriate output options. Recalculations uncertainty calculations include site assignments for multi-site...