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Cosmogenic 10Be and 26Al dating of paleolake shorelines in Tibet. Download PDF. Recommend Documents.

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Darryl E. Granger, Multiple cosmogenic nuclides with different decay rates can be used to date exposure and burial of rocks over the timescales of radioactive decay.

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We use the cosmic-ray-produced radionuclides 26 Al and 10 Be to date Plio-Pleistocene glacial sediment sequences. These two nuclides are produced in quartz at a fixed ratio, but have different decay constants. This method, however, requires simplifying assumptions about the 26 Al and 10 Be concentrations in the sediment at the time of burial.

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The Xujiayao-Houjiayao site in Nihewan Basin is among the most important Paleolithic sites in China for having provided a rich collection of hominin and mammalian fossils and lithic artifacts. Based on biostratigraphical correlation and exploratory results from a variety of dating methods, the site has been widely accepted as early Upper Pleistocene in time. Two quartz samples from a lower cultural horizon give a weighted mean age of 0.

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Roderick J. Sewell, Timothy T. Barrows, S.

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Aluminium26 Al, is a radioactive isotope of the chemical element aluminiumdecaying by either of the modes beta-plus or electron captureboth resulting in the stable nuclide magnesium The half-life of 26 Al is 7. This is far too short for the isotope to survive to the present, but a small amount of the nuclide is produced by collisions of argon atoms with cosmic ray protons.

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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. Surface exposure dating is used to date glacial advances and retreatserosion history, lava flows, meteorite impacts, rock slides, fault scarpscave development, and other geological events. It is most useful for rocks which have been exposed for between 10 years and 30, years [ citation needed ].

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The Xujiayao-Houjiayao site in Nihewan Basin is among the most important Paleolithic sites in China for having provided a rich collection of hominin and mammalian fossils and lithic artifacts. Based on biostratigraphical correlation and exploratory results from a variety of dating methods, the site has been widely accepted as early Upper Pleistocene in time. Two quartz samples from a lower cultural horizon give a weighted mean age of 0.

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