Cosmogenic isotope dating

It also serves as a repository for data generated by the group, descriptions of our lab procedures, technical information and calculation methods.

cosmogenic isotope dating-57

Concentrations of cosmogenic nuclides produced Cl) are routinely measured in minerals or whole rock samples to determine the exposure age of a wide range of landforms, many of which could not otherwise be dated directly.

For example, beach berms, moraines, terraces, alluvial fans, landslides, lavas, fault scarps, meteorite craters, felsenmeer, and tors ranging in age from 10 terrestrial cosmogenic nuclide (TCN) dating methods.

Our work has two specific goals: to evaluate the effects of episodic geomorphic events in modulating cosmogenic inventories in surface rocks in polar deserts and to generate an alpine glacier chronology that will serve as a robust record of regional climate variation over the last several million years.

A key objective is to produce a unique sampling strategy that yields consistent exposure-age results by minimizing the effects of episodic geomorphic events that obfuscate cosmogenic-nuclide chronologies.

The SUERC Ar/Ar laboratory has three magnetic sector mass spectrometers which it operates for the NERC-funded national facility.

As far as is currently known, TCNs have not yet been exploited directly in Scottish archaeological contexts, but there is great potential for their application, given the research capacity and analytical capability that are available in Scotland (see below).The ages are uncorrected for temporal variations in production rates and may underestimate the true ages by 5–7%.The former age, although implying early deglaciation for this area of the British ice sheet, is not incompatible with minimum deglaciation ages from other contexts and locations in northwest England.Along with our colleagues Kate Swanger, Doug Kowalewski, and Joerg Schaefer, we are examining the role of physical and chemical weathering in modifying the inventory of cosmogenic nuclides in exposed rocks.In our collaborative NSF grant, entitled , we seek to investigate the impact of Earth-surface processes on the application of cosmogenic exposure dating in Antarctica by combining multi-nuclide techniques, detailed field experiments, rock-mechanic studies, and climate modeling.TCNs) as a result of the interactions between secondary cosmic radiation and minerals in that lattice, and the Ar-Ar technique is a development of the technique that relies on the decay of K to Ar to date volcanic rocks and weathering products.

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