Coastal Restoration Trust of New Zealand

Coastal Dune Ecosystem Reference Database

Facies depositional setting, mineral maturity and sequence stratigraphy of a Holocene drowned valley, Tamaki estuary, New Zealand Journal Paper

Abraham, G.M.S.; Nichol, S.L.; Parker, R.J.; Gregory, M.R.
Journal / Source
Estuarine, Coastal and Shelf Science
Tamaki Estuary, lithofacies, sequence stratigraphy, mineral maturity, estuaries, Auckland
Tamaki Estuary in northern New Zealand is a mixed-energy estuary that comprises three facies zones: (1) a wave- and tide-influenced inlet with sandspit; (2) a tide-dominated, funnel-shaped zone with wide intertidal flats and sandy tidal bars, and (3) a mixed fluvial influenced and tidal meandering upper zone. Each zone preserves a Holocene record of sedimentation that was reconstructed using six cores ranging between 3- and 6-m depth. Sample analyses included textural and mineralogical composition, organic and carbonate content, and radiocarbon dating of in situ shells. The Tamaki Estuary valley fill consists of transgressive marine sands and tidal bar sands in the lower estuary, mud and sand facies in the middle estuary, and mud and peat facies in the upper estuary. These facies were deposited in a marine
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