TY - JOUR
T1 - Holocene sediments and vertical tectonic downwarping near wairoa, Northern Hawke's Bay, New Zealand
AU - Ota, Yoko
AU - Berryman, K. R.
AU - Brown, L. J.
AU - Kashima, Kaoru
N1 - Funding Information:
We thank: N oZ9mi Iso, Masumi Miyoshi, Kenichiro Yamashina, and Takahiro Miyauchi for assistance in the field; Alan Beu for identification of the small broken shell fragments; Margaret Harper for assistance in identification of the diatom assemblage; Hawke's Bay Regional ~ater Board, Napier, and Ron Allnatt for well logs; John Power, Bnckell, Moss & Partners Consulting Engineers for supplying drillhole logs and samples; and Charlie McGill for radiocarbon dating. Weare also grateful to Alan Hull for discussion and Brad Pillans for critical reading of our fIrst draft and to two anonymous reviewers for helpful suggestions. ~ work was supported by funding through a grant-in-aid for overseas scientific survey from the Ministry of Education, Science and Culture, Japan (Project numbers 60041029 and 61043025) and by New Zealand Geological Survey.
PY - 1989/7/1
Y1 - 1989/7/1
N2 - Depositional environments for Holocene terrestrial, estuarine, and marine sediments on the Wairoa River floodplain at Wairoa and coastal plain east of Wairoa, were determined from an analysis of stratigraphy, lithologies, and diatom assemblages obtained from auger holes and foundation and water-well drillholes. The sediments were deposited during the postglacial sea-level rise which started sometime prior to c. 9200 years ago and ended at c. 4000 years ago, when the shoreline was at least 2 km landward of the present position, and a ria-like morphology had developed at the innermost edge of the present-day coastal plain. The postglacial marine sediments usually occur slightly below the present sea level (down to -4 m a.m.s.l.) indicating net tectonic subsidence during the Holocene. Other evidence suggests that this tectonic subsidence may extend back into the middle Pleistocene.
AB - Depositional environments for Holocene terrestrial, estuarine, and marine sediments on the Wairoa River floodplain at Wairoa and coastal plain east of Wairoa, were determined from an analysis of stratigraphy, lithologies, and diatom assemblages obtained from auger holes and foundation and water-well drillholes. The sediments were deposited during the postglacial sea-level rise which started sometime prior to c. 9200 years ago and ended at c. 4000 years ago, when the shoreline was at least 2 km landward of the present position, and a ria-like morphology had developed at the innermost edge of the present-day coastal plain. The postglacial marine sediments usually occur slightly below the present sea level (down to -4 m a.m.s.l.) indicating net tectonic subsidence during the Holocene. Other evidence suggests that this tectonic subsidence may extend back into the middle Pleistocene.
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U2 - 10.1080/00288306.1989.10425713
DO - 10.1080/00288306.1989.10425713
M3 - Article
AN - SCOPUS:0024831064
SN - 0028-8306
VL - 32
SP - 333
EP - 341
JO - New Zealand Journal of Geology, and Geophysics
JF - New Zealand Journal of Geology, and Geophysics
IS - 3
ER -
