speed dating questions to ask a guy - Uranium series dating of quaternary deposits
These techniques can be grouped as numerical, relative dating, and correlation.
Research involved both surface- and subsurface-based investigations of geochronology, hydrology, and paleoclimate using natural isotopes of strontium and the uranium-series disequilibrium chain for tracing hydrologic pathways and for isotopic dating a wide range of hydrogenic deposits. Council Post-doc, USGS, Branch of Isotope Geology (1990 to 1991)1) Geochemical, isotopic (Pb, Sr, Nd), and geochronological investigation of granulite nodules from southern Superior Province kimberlites. to Dec., 1989)Collected Sr and Nd isotope compositions on whole rocks and mineral separates of Apollo 17 mare basalts and interpreted results with respect to eruptive ages and mantle differentiation events. P., 1984, Fluorapatite from the King Lithia mine, Custer County, South Dakota.
Major tasks included (1) providing paleoenvironmental histories and the timing of seismic events by dating surface deposits at numerous faults across the site, (2) understanding the paleohydrologic significance of secondary minerals in the deep unsaturated zone (UZ) in terms of the timing and amounts of percolation flux, sources of fracture water, and impacts of climate change on deep UZ flow, (3) determine the degrees of Pleistocene water-rock interaction to evaluate UZ-flow processes such as flow focusing in fault zones and fractures, capillary barrier effects, extent of past water-table rises beneath the repository, (4) defining flow paths in the regional saturated-zone ground-water system, and (5) studying the history and nature of Pleistocene discharge deposits in nearby areas to determine how the regional ground-water system responded to Pleistocene climate change. 2) High-precision, single-zircon U-Th-Pb geochronological study of mafic intrusive rocks of the 1.1 Ga Duluth Complex that led to major rethinking of magma generation and differentiation processes during Midcontinent Rifting. AWARDS USGS Superior Service Award – August 2005 – for development and application of innovative U-series disequilibrium analyses PROFESSIONAL AFFILIATIONSGeological Society of America American Geophysical Union Geochemical Society International Association of Geochemistry Publications: Wilson, M.
The growth of U, can be used over a time range from a few hundred to half a million years.
Calcite precipitated from running or dripping water in springs and caves, as well as marls and soil-deposited calcretes may be spatio-temporally associated with archaeological materials; they can be dated by U measurements with a precision of ±5–10% of the age (by alpha counting) or ±1% (by mass spectrometry).
Hasandaǧı, Acıgöl and Göllüdaǧı) known as the late Quaternary and their widespread volcanoclastic products.
Recent studies have suggested at least 11 events at around Acıgöl Caldera for the last 180 ka and 2 events at Hasandaǧı Stratovolcano for the last 30 ka.Projects I am currently or recently (last 4 years) involved in include: • Geologic Mapping Studies at Buffalo National River, AR (Funding source: USGS-GEC SC) • Greater Platte River Basins and N. Plains Geologic Framework Studies, CO & NE (USGS-GEC SC) • Cenozoic Landscape Evolution of the Southern Rocky Mountains, NW & CO (USGS-GEC SC) • Underground Test Area (UGTA) Environmental Restoration Project, NV (DOE) • Pleistocene water-table fluctuations and aquifer contributions at Wind Cave National Park, SD (NPS) • Snowmastodon Studies, Snowmass, CO (Denver Museum of Nature & Science) • Uranium-series dating of megafauna sites in the western U. (Center for American Paleolithic Research) • Hydrologic Processes at Pahranagat National Wildlife Refuge, NV (USFWS) • Rates and Evolution of Peat Accretion through Time, Sacramento-San Joaquin Delta, CA (USGS-CA WSC) • Radiogenic isotope tracers as a tool to understand groundwater flow, mixing, and hydrologic connectivity in the Upper Geyer Basin, Yellowstone National Park (NPS) • Th/U ages supporting Hanford Site‐wide probabilistic seismic hazard analysis, WA (DOE) • Missouri caves paleoseismic study (USGS – Earthquake Hazards Program) Research Hydrologist, USGS, Yucca Mountain Project Branch, (1992 to 2010) Primary research responsibilities focused on geochemical and isotopic characterization of the Nation’s proposed high-level radioactive waste repository at Yucca Mountain, Nevada. Uranium decays through a number of radioactive daughter isotopes, some of which have half-lives comparable to the time scale of prehistoric archaeology.The growth of these isotopes in naturally occurring materials at archaeological sites can be used to determine the age of sites. Tenn.; Sr-Nd isotopes of Apollo 17 basalts 1990-1992: Postdoc, USGS, Branch of Isotope Geology: Lower crustal nodules from Michigan kimberlites; High-precision U-Pb dating of Duluth Complex single zircons 1992-2010: USGS, Yucca Mtn. B., 1985, Carbonate alteration minerals in the Salton Sea geothermal system, California, USA.Tags: Adult Dating, affair dating, sex dating