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Cosmogenic dating basalt

This study focuses on acquiring an age estimate for the Ice Springs Volcanic Field located in Millard County, Utah.

The Ice Springs Volcanic Field is part of the Black Rock Desert and is home to four cinder cones: Crescent, Miter, Pocket, and Terrace, each of which erupted lava flows over time.

When one of these particles strikes an atom it can dislodge one or more protons and/or neutrons from that atom, producing a different element or a different isotope of the original element.

In rock and other materials of similar density, most of the cosmic ray flux is absorbed within the first meter of exposed material in reactions that produce new isotopes called cosmogenic nuclides.

AB - The Payún Matru volcanic field encompasses more than 12,000km2 in the west-central Argentine province of Mendoza.

Given the large uncertainties associated with dating young lava flows, the K→Ar age and our cosmogenic ages are in reasonable agreement; however, they do not overlap within uncertainties and suggest possible systematic discrepancies between the two methods of up to 20% in this instance.The lava emplacement history of Ice Springs has been debated since Hoover (1974) first proposed his theory of emplacement.A key piece of information that could aid in finalizing an emplacement history is an age estimate for Ice Springs.Only one official age for Ice Springs has been documented by Valastro et al.(1972), who used radiocarbon dating to analyze a piece of root fragment found from underneath a lava flow, and found an age of 660 /- 170 years.At Earth's surface most of these nuclides are produced by neutron spallation.Using certain cosmogenic radionuclides, scientists can date how long a particular surface has been exposed, how long a certain piece of material has been buried, or how quickly a location or drainage basin is eroding.We sampled primary lava flow features (tumuli, pahoehoe and aa flow surfaces) from two different basaltic lava flows and one fluvial strath for cosmogenic He.Exposure ages for primary lava flow features covering a large area just east of where Route 40 crosses the Río Grande range from 41 to 43ka with external uncertainties on the order of 7%.These particles interact with atoms in atmospheric gases, producing a cascade of secondary particles that may in turn interact and reduce their energies in many reactions as they pass through the atmosphere.By the time the cosmic ray cascade reaches the surface of Earth it is primarily composed of neutrons.

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  1. The northwestern part of the field, called Los Volcanes, includes multiple basaltic lava flows and numerous cinder cones and scoria fields. We sampled primary lava flow features tumuli, pahoehoe and aa flow surfaces from two different basaltic lava flows and one fluvial strath for cosmogenic 3He exposure age dating in.

  2. Cation of surface exposure dating to many funda- mental paleoclimate problems. In order to im- prove scaling schemes, numerous calibration sites spanning a wide range of time scales, latitudes and elevations are required. Basaltic lava £ows containing olivine or clino- pyroxene are ideal surfaces for cosmogenic 3He.

  3. Mar 6, 2013. As a result of focusing on stable nuclides, we adopt basalt as an example rock, given that phenocrysts in basalt e.g. olivine, pyroxene are common targets for stable cosmogenic nuclide exposure dating. e.g. Kurz, 1986; Margerison et al. 2005; Blard and Farley. 2008; Gayer et al. 2008; Dunai, 2010.

  4. These new ages have local significance for the geo- chronology of the Zuni-Bandera volcanic field; however, their larger significance is in their applicability to dating Quaternary basalts and quantifying erosion rates. Keywords dating Quaternary basalts, U-Th-Ra disequilibria, 3He and. 36Cl cosmogenic ages, erosion rates.

  5. Noble gas isotope laboratory. Isotope Geosciences. PhD position in cosmogenic nuclide research Determining the production rate of cosmogenic isotopes using basalt lavas from Ascension Island, Atlantic Ocean. Project Accurately determining when, and how frequently, volcanoes have erupted is imperative for.

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