Lacustrine sediment traps and their effect on continental shelf sedimentation—South Island,New Zealand |
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| Authors: | Lionel Carter Robert M Carter |
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| Institution: | (1) Division of Water Science, New Zealand Oceanographic Institute, Private Bag, Kilbirnie, Wellington, New Zealand;(2) Geology Department, James Cook University, 4811 Townsville, Queensland, Australia |
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| Abstract: | Seismic data and cores from the Waitaki continental shelf, New Zealand, indicate a major reduction in terrigenous deposition
about 10,000 years ago when the accumulation of extensive marine sand wedges ceased. This change reflects the impact of lacustrine
traps on the main sediment supplier to the shelf, the Waitaki River. Prior to 10,000 years BP, lakes Ohau, Pukaki and Tekapo
were glaciated and glacio-fluvial detritus was fed directly to the river and shelf where marine deposition was ca. 6.8×106 t/yr. Following deglaciation, the newly created lakes acted as efficient sediment traps that denied the river 22.2×106 t/yr. Accordingly, modern shelf deposition is around 0.04×106 t/year. |
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