Schmidt hammer exposure-age dating (SHD) of late Quaternary fluvial terraces in New Zealand

作者：Stahl Timothy^*; Winkler Stefan; Quigley Mark; Bebbington Mark; Duffy Brendan; Duke Daniel

来源：Earth Surface Processes and Landforms, 2013, 38(15): 1838-1850.

DOI：10.1002/esp.3427

• Schmidt hammer
• exposure-age dating
• fluvial terrace
• outwash plain

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 similar to 22% of the surface age suggest that Schmidt hammer exposure-age dating (SHD) is a reliable calibrated-age dating technique for fluvial terraces.

• 出版日期2013-12