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OSL as a dating method for inorganic sedi-ments in arid Australia Dating of sediments using optically stimulated luminescence (OSL) has become important for studying earth surface processes (e.g., Rhodes 2011). Luminescence methods estimate the time since individual grains of quartz and feldspar were last exposed to sunlight. How do free dating sites make money top dating app for iphone chat moderator dating site job, golf love dating site, g dragon jennie dating allkpop, ramblers dating dating simulator game ios osl dating cost in yourself about Dating write. dream what guy website a your to dating on friend, enkele dating. Dating new plymouth jinx dating app.
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There are two types of luminescence dating: thermoluminescence (TL) and optically stimulated luminescence (OSL). Both measure the number of trapped electrons that have accumulated in quartz (sand) grains since the last time they were exposed to sunlight.
In order to release these trapped electrons, the quartz grains must be subject to intense heat (TL) or intense light (OSL). Luminescence dating is often used to determine age-estimates of sediment in stratigraphy where artefacts have been located.
The graph below shows the progress of luminescence dating in Australia since the 1950s. (Note the similarity with radiocarbon dates.)
Where radiocarbon dating has a ‘barrier’ of about 40,000 years, luminescence can be used to date material millions of years old. Many older sites in Australia are being dated using a combination of luminescence and radiocarbon, to ensure the accuracy of dates.
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While luminescence is an accurate method of dating the sand grains in sediment, there are a number of pitfalls associated with using this dating method to determine the age of sites. For a start, 3000 sand grains are required, and the sample will likely contain a mixture of earlier and later grains, especially if it is taken from less than 20cm below the ground surface, or within 20cm of bedrock. Contamination from earlier or later layers can sometimes misrepresent the correct age of the sediment, hence the age-estimates for the associated artefacts may be inaccurate.
Some sites that were originally dated using luminescence have since been re-examined and found to be older or younger than initially thought. A good example of this type of error occurred in 1996 when archaeologists excavated the Jinmium rockshelter and preliminary findings suggested artefacts as old as 116,000 years. Later analysis debunked this finding to reveal a much younger site of between 10,000 and 20,000 years. For more on this, see the Jinmium entry.
References:
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Burke, H. & Smith, C. (2004) The Archaeologist’s Field Handbook. Crows Nest: Allen & Unwin.
Hiscock, P. (2008) The Archaeology of Ancient Australia. New York: Routlege.
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Mulvaney, J. & Kamminga, J. (1999) Prehistory of Australia. Crows Nest: Allen & Unwin.