New Zealand Journal of Geology and Geophysics abstracts
The application and implications of rock weathering-rind dating to a large rock
avalanche, Craigieburn Range, Canterbury, New Zealand
JOHN F. ORWIN
Department of Geography
University of Canterbury
Private Bag 4800
Christchurch, New Zealand
Abstract Weathering-rind dating of a rock-avalanche deposit
in the Ryton valley, Craigieburn Range, Canterbury, New Zealand, previously
considered to be of one event, revealed two events, one at approximately A.D.
1422 (+/-96 years) and one at approximately A.D. 1632 (+/-55 years). Two
distinct source areas were identified, with the younger avalanche deposit
mantling part of the older deposit. Correlation with other rock avalanche
events in the Southern Alps suggests that between A.D. 1400 and 1500 there was
a large magnitude seismic event causing widespread, coseismic rock avalanching.
Further correlation with other rock avalanche dates in this region should
contribute to continued refinement of paleoseismicity in the Canterbury region.
Keywords rock avalanche(s); Ryton valley; weathering rinds;
dating; earthquakes
New Zealand Journal of Geology and Geophysics, 1998, Vol. 41: 219-223
0028-8306/98/4103-0219 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (1288K); (scanned from paper original: notes about this process)
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