Optical bleaching front in bedrock revealed by spatially-resolved infrared photoluminescence

Scientific Reports
E L SellwoodM Jain

Abstract

Optically stimulated luminescence (OSL) dating of sediment, based on the accumulation of trapped charge in natural crystals since their last exposure to daylight, has revolutionised our understanding of the late Quaternary period. Recently, a complementary technique called luminescence rock surface dating (RSD), which uses differential spatial eviction of trapped charges in rocks exposed to daylight, has been developed to derive exposure and burial ages, and hard-rock erosion rates. In its current form, the RSD technique suffers from labour intensive sample preparation, uncertainties in the depth and dose rate estimates, and poor resolution of the luminescence-depth profile. Here, we develop a novel, 2D luminescence imaging technique for RSD of large rock slabs (3 × 5 cm) to overcome these challenges. We utilize the recently discovered infrared photoluminescence (IRPL) signal for direct, non-destructive imaging of the luminescence-depth profile in a sub-aerially exposed granitic rock, with an unprecedented spatial resolution of ~140 µm. We further establish a correlation between luminescence and geochemistry using micro X-ray fluorescence (µXRF) spectroscopy. Our study promises a substantial advancement in luminescence imaging ...Continue Reading

References

Nov 19, 2002·Die Naturwissenschaften·Steffen GreilichGünther A Wagner
Dec 21, 2004·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Dieter F Regulla
Jan 22, 2005·Science·Tom P GuildersonTom A Brown
Aug 29, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Mayank JainMartin Thalbitzer Andersen
Aug 27, 2014·Proceedings of the National Academy of Sciences of the United States of America·Joel L PedersonGary Cox
May 29, 2015·Nature Methods·Tobias PietzschPavel Tomancak
Sep 28, 2017·Scientific Reports·Amit Kumar PrasadMayank Jain

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Methods Mentioned

BETA
X-ray

Software Mentioned

MATLAB Image Processing Toolbox
OSL
BigWarp
ImageJ
IRPL

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