New Zealand Journal of Geology and Geophysics abstracts

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Short communication
Early Pliocene landward submarine slumping, Lachlan Basin, Hawke Bay, New Zealand

Brian D. Ricketts*
Campbell S. Nelson

Department of Earth Sciences
University of Waikato
Private Bag 3105
Hamilton, New Zealand

*Present address: Department of Geology, University of Auckland, Private Bag 92 019, Auckland, New Zealand.
email: b.ricketts@auckland.ac.nz

Abstract  Early Pliocene slumping is identified in a seismic profile that traverses offshore Lachlan Basin in Hawke Bay, eastern North Island. The slump is identified by a package of chaotic discontinuous reflections that overlies a basal Pliocene unconformity and is bounded above, laterally, and below by coherent, continuous reflections. It is upwards of 0.25 s thick (c. 200 m) and has a profile extent of c. 12 km. The slump was generated from the western flank of Lachlan Ridge, a thrust-cored structure that was actively growing at this time. Mass transport of sediment was landward, opposite that for the younger Kidnappers Slide and other major slope failure complexes in the region.

Keywords  Lachlan Basin; Hawke Bay; growing anticline; accretionary prism; slope failure; slumping; seismic stratigraphy; Pliocene

G03064; Received 17 November 2003; accepted 5 March 2004; Online publication date 7 September 2004
New Zealand Journal of Geology & Geophysics, 2004, Vol. 47: 431-435
0028-8306/04/4703-0431 © The Royal Society of New Zealand 2004

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