Statistical distributions of cosmogenic exposure dates

Modeling the statistical distributions of cosmogenic exposure dates from moraines

Geomorphic process modeling allows us to evaluate different methods for estimating moraine ages from cosmogenic exposure dates, and may provide a means to identify the processes responsible for the excess scatter among exposure dates on individual moraines. Cosmogenic exposure dating is an elegant method for estimating the ages of moraines, but individual exposure dates are sometimes biased by ...

Comment on "Absence of cooling in New Zealand and the adjacent ocean during the Younger Dryas chronozone".

Barrows et al. (Reports, 5 October 2007, p. 86) presented cosmogenic exposure dates and data from an ocean sediment core that challenge evidence for glacier advance in New Zealand during the Younger Dryas event. We use modeling of geomorphic processes to argue that their cosmogenic exposure dates are inconclusive.

EARTHQUAKE FOCAL DEPTHS AND SOURCE PARAMETERS IN THE ZAGROS MOUNTAINS Patrick Applegate Richard Alley REFINING MORAINE AGE ESTIMATES FROM COSMOGENIC EXPOSURE DATES USING THE MAXIMUM LIKELIHOOD METHOD Brett

Estimation of slip rates in the southern Tien Shan using cosmic ray exposure dates of abandoned alluvial fans

Cosmic ray exposure dates (based on in situ–produced 10Be), in combination with measured heights of fault scarps that cut three abandoned fans, imply a slip rate of less than ~2 mm/yr on the bounding thrust fault along a segment of the southern flank of the Tien Shan of central Asia. This rate, somewhat lower than those for the segment farther west and for the northern margin of the belt, impli...

Deciphering boulder mobility and erosion from cosmogenic nuclide exposure dating

[1] Large boulders are prominent features in many geomorphic systems and are frequently targeted for cosmogenic exposure dating. Presently, there are little data or theory predicting exposure age, erosion rate, and mobilization frequency of boulders in environments such as channels, talus slopes, or moraines. Here we explore the potential for cosmogenic isotope analysis to constrain the transpo...