Abstract
Abstract The off-shore region between Mt Egmont and the Kaipara Harbour entrance forms the off-shore portion of the Egmont—Kaipara Sand System. The late post-glacial input of sand from landward sources into this system is less than 7% of the volume of post-glacial dunes which forms its coastal deposits. The only other source for the dune sand is the sea floor. Hence it is not surprising that the mineralogy of the sea floor and dune sands is the same. Furthermore, five separate periods of progradation are recognised that are correlated with five periods of sea-level fluctuations which have occurred during the post-glacial fall in sea-level from a local maximum of +2.1 m, 4425 years ago. The volume of progradation is approximately proportional to the net fall in sea level during each fluctuation. Departures from this proportionality are due mainly to insufficient time for equilibrium to be established between sea floor and new sea level. Sea level is currently rising and is promoting deposition on the sea f...
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