New Zealand Journal of Geology and Geophysics abstracts

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Late Neogene sedimentation adjacent to the tectonically evolving North Island axial ranges: insights from Kuripapango, western Hawke’s Bay

Greg H. Browne

Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand
email: g.browne@gns.cri.nz

Abstract  Kuripapango-Blowhard is a relatively small region in western Hawke’s Bay, but one that displays a stratigraphically diverse Neogene sedimentary record. Earliest sedimentation on greywacke basement consisted of late Miocene (?Tongaporutuan–Kapitean) conglomerate, sandstone, and calcareous sandstone of the Blowhard Formation (new). Deposition of siliciclastic and mixed carbonate sediments of the Mangatoro, Te Waka, Kaumatua, and Sentry Box Limestone Formations continued through to late Pliocene (Nukumaruan) time. These sediments are divided into a broadly transgressive to regressive succession that is up to 2 km thick. The lithologies indicate a strong link between sediment supply and active tectonism through time. An initial pulse of uplift is suggested during the late Miocene, followed by widespread subsidence and relative tectonic quiescence. A later, and temporally distinctive period of late Pliocene tectonic uplift in the region has continued to the present day. Contrasts in the sedimentary record in adjacent fault-bounded blocks suggest different sedimentary histories related to whether the fault blocks were uplifted and eroded, or were subsiding and were depocentres for sediment.

Keywords  sedimentation; tectonic uplift; Blowhard Formation (new); Spiral Conglomerate Member (new); Waikarokaro Member (new); Mangatoro Formation; Te Waka Limestone; Kaumatua Formation; Sentry Box Limestone; Kaweka Range; Ruahine Range; Kuripapango; Hawke’s Bay; new stratigraphic names

G03039; Received 9 April 2003; accepted 31 October 2003; Online publication date 1 December 2004
New Zealand Journal of Geology & Geophysics, 2004, Vol. 47: 663–674
0028–8306/04/4704–0663© The Royal Society of New Zealand 2004

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