Cosmogenic dating inheritance

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Surface exposure dating

Cosmogenic nuclide dating

Jan Dzierzek, Marek Zreda. Determining the age of glacial and glaciofluvial deposits is necessary to better understand the deglaciation of northeastern Poland. Cosmogenic 36 Cl, accumulated in boulders and matrix, suggests that inheritance and erosion affect cosmogenic inventories and must be taken into account when calculating exposure ages of landforms. A simple approach to detect and distinguish between the two effects, by comparing the inventories of 36 Cl in boulders and matrix, allows us to compute appropriate corrections to apparent uncorrected ages and to determine model corrected exposure ages of the deposits. Model ages of glacial and glaciofluvial deposits fall into one of three time intervals. The oldest erratics, ky Kruszki and Bachanowo 1 , date the advance of the Weichselian ice sheet.

Cosmogenic nuclide dating

Collecting rock samples in Scotland must be done responsibly — even in areas without statutory designation or other conservation protection. Before visiting a site, you should ask the landowner for permission to take samples. You may also need to apply for a permit to collect samples if the land is part of a National Nature Reserve or other protected area. As far as possible, choose sampling sites located away from footpaths or that are not readily visible. Avoid iconic boulders and boulders with historical or cultural connections e.
Terrestrial cosmogenic nuclide TCN exposure dating has become the most dominant technique for constraining glacial chronologies. This is particularly true for the Tibetan Plateau because of its low frequency of organic material limiting the possibilities to use radiocarbon dating and high altitude favouring TCN dating with high cosmogenic nuclide production rates , with, consequently, a large number of TCN samples processed. However, multiple samples from one glacial deposit commonly yield a wide range of TCN ages which complicates their interpretation. Two principal possibilities can cause a wide range of ages to result from one glacial deposit. First, TCN ages may exceed the true age by a varying number of years as a result of pre-depositional cosmogenic nuclide inheritance.
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