Journal article
Optical dating of loessic hillslope sediments constrains timing of prehistoric rockfalls, Christchurch, New Zealand
R Sohbati, J Borella, A Murray, M Quigley, JP Buylaert
Journal of Quaternary Science | WILEY | Published : 2016
DOI: 10.1002/jqs.2895
Abstract
Developing a robust chronology for mass-movement events is of crucial importance to understanding triggering mechanisms and assessing hazards. We constrain the emplacement time of four palaeorockfall boulders near Christchurch, New Zealand, using optically stimulated luminescence (OSL) of quartz and infrared stimulated luminescence dating (IRSL) of K-feldspar from loessic hillslope deposits underlying and upslope of individual boulders. The quartz OSL and K-feldspar pIRIR290 ages are all consistent with the stratigraphy and in excellent agreement with each other, indicating that all the boulders that overlie the in situ loess must have been emplaced <13 ka ago. A comparison of luminescence a..
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Funding Acknowledgements
R.S. would like to thank Carlsberg Foundation for financial support (Grant No. 2012_01 _0838) during this project. Joy Mailand-Hansen is thanked for sample preparation. The New Zealand Earthquake Commission is acknowledged for provision of finances under a Capability Grant and a PhD scholarship to J.B. Frontiers Abroad also provided financial support for this research. J.P.B. thanks the Danish Council for Independent Research - Natural Sciences (FNU) for financial support (Steno Grant No. 11-104566). We would also like to thank Dr Peter Almond and an anonymous reviewer for their constructive comments on the manuscript.