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Cosmogenic burial dating

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The announcement was made at the University of the Witwatersrand in Johannesburg following the publication of their paper, titled: New cosmogenic burial ages for Sterkfontein Member 2 Australophithecus and Member 5 Oldowan, in the prestigious scientific journal, Nature, on 1 April 2015.The researchers announced: DATING Sterkfontein has been internationally famous since 1936 for its key hominid and palaeontological discoveries and since the 1950s for its early archaeological finds. supervised AMS measurements and methods development. Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface. One sample shown as an open symbol lies below the isochron and has been reworked from an older deposit. A single outlier lies far above the line and has been excluded from analysis. This turns out to be a very useful nuclide pair because quartz is so common — nearly all sedimentary deposits contain quartz that has been exposed for a time and then buried as the deposit accumulated.Dating sediment burial over million-year time scales is crucial in many areas of the Earth sciences and archeology, but is often difficult using traditional techniques.

This post is about cosmogenic-nuclide burial dating, and how to make it better.

However, two difficulties are typically encountered: 1) old deposits or strongly affected by cosmogenic nuclide inheritance often appear to be saturated, and 2) a full propagation of uncertainties often yields poorly constrained ages.

Here we show how to combine surface-exposure-dating and burial-dating techniques in the same profile to get more accurate age results and to constrain the extent of pre-depositional burial periods.

When one of these particles strikes an atom it can dislodge one or more protons and/or neutrons from that atom, producing a different element or a different isotope of the original element.

In rock and other materials of similar density, most of the cosmic ray flux is absorbed within the first meter of exposed material in reactions that produce new isotopes called cosmogenic nuclides.