Journal article
Schmidt hammer exposure-age dating (SHD) of late Quaternary fluvial terraces in New Zealand
T Stahl, S Winkler, M Quigley, M Bebbington, B Duffy, D Duke
Earth Surface Processes and Landforms | Published : 2013
DOI: 10.1002/esp.3427
Abstract
Schmidt hammer (SH) R-values are reported for surface clasts from numerically dated Holocene and Pleistocene fluvial terraces in the South Island of New Zealand. The R-values are combined with previously obtained weathering rind, radiocarbon, terrestrial cosmogenic nuclide and luminescence terrace ages to derive SH R-value chronofunctions for greywacke clasts from four distinct locations. Our results show that different weathering rates affect the form of the SH R-value versus Age curve, however a fundamental dependency between the two remains constant over timescales ranging from 102 to 105years. Power law scaling constants suggest changes in clast weathering rates are primarily affected by..
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Funding Acknowledgements
This work was partially funded by a University of Canterbury Doctoral Scholarship, University of Canterbury Mason Trust grant, and New Zealand Earthquake Commission funding. The authors would like to thank the numerous landowners for allowing them access to their properties and their general interest in the work. Useful discussions with Eric Bilderback, Sam McColl, Jocelyn Campbell, Hazel Albertyn and the geomorphology groups at the University of Canterbury, Victoria University of Wellington, and Australasian Quaternary Association helped in writing this paper. Thorough reviews by Rick Shakesby and an anonymous reviewer significantly improved the presentation of the manuscript.