New Zealand Journal of Geology and Geophysics abstracts
Tilting of active folds and faults in the Manawatu region, New Zealand:
evidence from surface drainage patterns
JAMES JACKSON
Bullard Laboratories
Madingley Road
Cambridge CB3 OEZ, United Kingdom
RUSS VAN DISSEN
KELVIN BERRYMAN
Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand
Abstract We examine the drainage system on four anticlinal
ridges in Manawatu that affect a mid-Quaternary (c. 300 000 yr
old) marine horizon. The folds are all located above buried, west-dipping,
reverse faults in the basement that are c. 15-20 km long and capable
of generating earthquakes of c. MW 6.5-7.0. The drainage systems
allow us to distinguish a regional tectonic tilt from the normal plunge of an
anticline axis towards its end. We estimate tilt rates of around 4 <->
10-8 rad/yr towards the south averaged over the last
c. 300 000 yr. The regional tilting is related to the
development and southward migration of the Pliocene-Pleistocene depocentre in
the offshore South Wanganui Basin.
Keywords geomorphology; drainage; faulting; active
tectonics
New Zealand Journal of Geology & Geophysics, 1998, Vol. 41:
377-385
0028-8306/98/4104-0377 $7.00/0 (c) The Royal Society of New Zealand
1998
PDF file of entire paper: medium quality (2794K); (scanned from paper original: notes about this process)
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