New Zealand Journal of Geology and Geophysics abstracts
A gravity survey of the Wharekauhau Thrust, Palliser Bay,
New Zealand
ALASTAIR F. MCCLYMONT
School of Earth Sciences
Victoria University of Wellington
P.O. Box 600
Wellington, New Zealand
Abstract A gravity survey undertaken at Wharekauhau, Palliser
Bay, New Zealand, determines the geometry of the Wharekauhau Thrust. Gravity
observations made along two profile lines perpendicular to the strike of the
fault, enable two-dimensional models of the thrust and Miocene-Quaternary basin
sediments to be constructed. Observed gravity is best modelled by a thrust
dipping 25 +/- 10deg. to the northwest over the depth interval 0-1 km. A
second fault of steeper but unresolvable dip is modelled in the region of the
Wharepapa River, across which Miocene-Quaternary sediments are downthrown
c. 100 m to the east. The basin sediments produce a 25 mgal
residual gravity low relative to the surrounding greywacke basement rock, which
suggests a thickness of 1800 +/- 500 m, similar to previously published
estimates.
Keywords Wharekauhau Thrust; Wairarapa Fault; gravity
survey
New Zealand Journal of Geology & Geophysics, 2000, Vol. 43:
303-306
0028-8306/00/4302-0303 $7.00/0 (c) The Royal Society of New Zealand
2000
Short communication
PDF file of entire paper: medium quality (368K); (scanned from paper original: notes about this process)
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