Cosmogenic isotope surface exposure dating Mobile sites for adult video chat

Posted by / 16-Nov-2019 02:00

Cosmogenic isotope surface exposure dating

Ice cover blocks the penetration of cosmic radiation, halting production of such isotopes; their abundance in a rock therefore gives a measure of the time since ice retreated: the ‘exposure age’.

This technique involves measuring the abundance of isotopes that are produced within rock surfaces when they are exposed to cosmic radiation.In the article on radiocarbon dating we have already introduced one cosmogenic isotope, Si and which has a half-life of 717,000 years.Because the isotopes we're using have a short half-life, it follows that if a rock has been buried for a few million years the quantities of these isotopes will be negligible.Thus nunataks act as a ‘dipstick’ for the former height of the ice sheet surface.Exposure ages measured on the erratics can provide an extremely detailed record of the progress of ice sheet thinning.

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Thus we will be able to tell how rapidly that part of the West Antarctic Ice Sheet (WAIS) has thinned, and when the thinning started and stopped.

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