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Sedimentation in Hawke Bay
Pantin, H.M. (1966). Sedimentation in Hawke Bay. NIWA Biodiversity Memoir, 28. New Zealand Oceanographic Institute: [s.l.]. 7-70 pp.
Deel van: New Zealand Oceanographic Institute Memoir. New Zealand Department of Scientific and Industrial Research: Wellington. ISSN 0083-7903
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| Abstract |
The surface sediments in Hawke Bay are divided into five groups: offshore gravel zones, sand belt, mud belt, central zone, and sediments associated with the Lachlan Ridge. These distinctions are made primarily on grain size. Over much of the Bay a relatively coarse sediment layer, sampled by coring, appears as a subsurface reflector on echo-sounding records. This layer underlies the relatively fine sediments of the mud belt and outcrops in the central zone. Shell material from the central zone has been 14C-dated as approximately 10,000 years B.P. The subsurface reflector shows the effect of faulting. The sand belt separates the mud belt from the shoreline and the distribution of these two zones appears to be governed by present-day sedimentation. The central zone and parts of the Lachlan Ridge are at present non-sedimentation areas. Other parts of the Lachlan Ridge are areas of slow sedimentation. Clastic minerals in the sediments of the Bay are mainly derived from the Mesozoic greywacke suite of the North Island or from the Taupo volcanic sequence, Quaternary in age, which covers a wide area in the region of Lake Taupo and includes ash layers extending as far as the coast of Hawke Bay. Tertiary sedimentary rock fragments are common only on the Lachlan Ridge. Authigenic glauconite is present on the Lachlan Ridge and in part of the sand belt. The mineral occurs as ovoids, subangular grains, pumice vesicle infillings, and foraminiferal infillings. Yellowish pumice infillings, which occur in the central zone and on parts of the Lachlan Ridge, apparently owe their colour to primary authigenic limonite. Secondary authigenic limonite, formed by the oxidation of glauconite, is found in the same areas as the latter mineral. |
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