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03-Jun-2017 10:51

Glacial geologists use this phenomenon to date glacial landforms, such as erratics or glacially transported boulders on moraines[7] or glacially eroded bedrock.

Dating glacial landforms helps scientists understand past ice-sheet extent and rates of ice-sheet recession.

It is an excellent way of directly dating glaciated regions.

It is particularly useful in Antarctica[1], because of a number of factors[2]: Cosmogenic nuclide dating is effective over short to long timescales (1,000-10,000,000 years), depending on which isotope you are dating.

Researchers suggested that the accumulation of these isotopes within a rock surface could be used to establish how long that surface was exposed to the atmosphere.

Assuming a constant rate of production, the number of atoms of Be-10 and Al-26 that accumulate in a rock surface will be proportional to the length of time the rocks were exposed to cosmic ray bombardment and the respective rates of radioactive decay for each isotope.

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We focus on applying this approach to till-paleosol sequences, but the basic idea of forming an Be burial isochron with a set of samples that share the same burial age, but differ in other aspects of their exposure history, applies to other stratigraphic settings as well.The method yields ages for four tills in Missouri that are stratigraphically consistent, agree with paleomagnetic age constraints, and show that ice advanced into Missouri near 1.25 Ma, near 0.8 Ma, and twice between ca. Cosmogenic isotopes are created when elements in the atmosphere or earth are bombarded by high energy particles (-mesons and protons, collectively known as cosmic rays) that penetrate into the atmosphere from outer space.Some cosmic ray particles reach the surface of the earth and contribute to the natural background radiation environment.

KEYWORDS cosmogenic radionuclide dating; glaciation; Himalayas; Late Quaternary; South. surface exposure dating, are useful for reconstructing the timing.… continue reading »

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Absolute radiometric dating. radionuclides like 26Al, 60Fe, 53Mn, and.… continue reading »

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