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

Auteur(s) et Affiliation(s)

STAHL, T.

Dept. of Geological Sciences, Univ. of Canterbury, Christchurch, Nouvelle-Zelande

WINKLER, S.

Dept. of Geological Sciences, Univ. of Canterbury, Christchurch, Nouvelle-Zelande

QUIGLEY, M.

Dept. of Geological Sciences, Univ. of Canterbury, Christchurch, Nouvelle-Zelande

BEBBINGTON, M.

Volcanic Risk Solutions, Massey Univ., Palmerston North, Nouvelle-Zelande

DUFFY, B.

Dept. of Geological Sciences, Univ. of Canterbury, Christchurch, Nouvelle-Zelande

DUKE, D.

Dept. of Geological Sciences, Univ. of Canterbury, Christchurch, Nouvelle-Zelande

Description :
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 4 distinct locations. The results show that different weathering rates affect the form of the SH R-value versus Age curve. 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.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 15, p. 1831-1850, nombre de pages : 20, Références bibliographiques : 2 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais