Cosmogenic surface exposure dating

Cosmogenic nuclide dating can also be used in this context to understand past ice-sheet thicknesses and changes in subglacial thermal regime.

Sampling strategy is the most important factor in generating a reliable exposure age.

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canadians datingsites - Cosmogenic surface exposure dating

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Trimlines can therefore also be used to reconstruct past ice sheet thickness.

However, this can be difficult, as thermal boundaries within the ice sheet may mean that it is more erosive lower down than higher up, and that cold, non-erosive ice on the tops of mountains may leave in tact older landscapes.

Once exposed to the atmosphere, the boulder will begin to accumulate cosmogenic nuclides.

Assuming that the boulder remains in a stable position, and does not roll or move after deposition, this boulder will give an excellent As well as using cosmogenic nuclide dating to work out the past extent of ice sheets and the rate at which they shrank back, we can use it to work out ice-sheet thicknesses and rates of thinning[5, 6].

Because cosmic rays become attenuated with depth through the rock, scientists are only interested in collecting the upper few centimetres of a rock’s surface.

Rock samples may be collected with a hammer and chisel or with a rock saw. One of the largest errors in cosmogenic nuclide dating comes from a poor sampling strategy.

When it reaches the terminus of the glacier, the boulder will be deposited.

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