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Schmidt hammer exposure‐age dating (SHD) of late Quaternary fluvial terraces in New Zealand
Author(s) -
Stahl Timothy,
Winkler Stefan,
Quigley Mark,
Bebbington Mark,
Duffy Brendan,
Duke Daniel
Publication year - 2013
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3427
Subject(s) - schmidt hammer , geology , weathering , fluvial , quaternary , radiocarbon dating , cosmogenic nuclide , holocene , clastic rock , river terraces , geomorphology , glacial period , denudation , paleontology , sediment , geochemistry , tectonics , structural basin , materials science , compressive strength , physics , cosmic ray , astrophysics , composite material
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 10 2 to 10 5 years. Power law scaling constants suggest changes in clast weathering rates are primarily affected by climatic (precipitation and temperature) and sedimentologic variables (source terrane petrology). Age uncertainties of ~22% of the surface age suggest that Schmidt hammer exposure‐age dating (SHD) is a reliable calibrated‐age dating technique for fluvial terraces. Copyright © 2013 John Wiley & Sons, Ltd.