Dating signal

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In this article we test for the first time the potential of single-grains of K-rich feldspar to date well-bleached and poorly bleached sediments using a post-IR IRSL (p IRIR) protocol.

We measure natural dose distributions using K-rich feldspars from four coastal samples applying the p IRIR protocol with a preheat of 200 °C and a p IRIR stimulation temperature of 180 °C; each sample had an independent age control obtained from quartz OSL and radiocarbon dating.

The analysis of the well-bleached samples shows that only the brightest 30% of the grains give p IRIR single-grain ages in agreement with the age control; this effect may arise from the suggested correlation between blue emission and potassium content of individual grains.

Comparison of single-grain quartz and feldspar dose distributions from the poorly bleached samples shows that quartz is relatively better bleached; nevertheless, selection of a reliable ‘minimum’ feldspar dose was achieved using two different statistical models.► We test the potential of feldspar single-grain to date sediments. ► In our samples p IRIR single-grain dose cannot be known better than ∼16.5%.

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Last modified 24-Feb-2016 06:19