Osl dating australia


Preliminary results of an optically stimulated luminescence dating study in the western Murray Basin in semi-arid south-eastern Australia are presented.The ultimate objective of the dating study is a reconstruction of dune formation indicative of palaeoclimatic changes in this region.So far, one site has been dated using the single-aliquot regenerative (SAR) dose protocol for quartz.A high scatter in individual palaeodoses was observed, which is unexpected in supposedly well bleached aeolian deposits.



The OSL ages indicate an extremely rapid initial phase of sedimentation (i.e.1600 m within a few hundred years, approximately 5 ka ago) followed by a constant rate of progradation for the past 4 ka of 0.39 m/a, with a high level of association between distance across the embayment fill and luminescence age for this time interval.An average rate of dune development of one dune every 80 yr from 3900 yr ago to the present day is apparent.The OSL ages for the late Holocene indicate that the present beach state is largely in equilibrium with sediment supply.

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OSL dating can be used to determine the time since naturally occurring minerals, such as quartz and feldspar, were last exposed to light within the last few hundreds of thousands of years.



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