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Geology; September 1995; v. 23; no. 9; p. 835-838; DOI: 10.1130/0091-7613(1995)023<0835:SPBITE>2.3.CO;2
© 1995 Geological Society of America
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Siliceous plankton bloom in the earliest Tertiary of Marlborough, New Zealand

C. J. Hollis1, K. A. Rodgers2 and R. J. Parker2

1 Institute of Geological and Nuclear Sciences, P.O. Box 30-368, Lower Hutt, New Zealand
2 Department of Geology, University of Auckland, Private Bag 92019, Auckland, New Zealand

In marked contrast to mass extinctions and productivity crises in much of the world' oceans at the Cretaceous-Tertiary boundary, siliceous plankton thrived in earliest Paleocene seas of Marlborough, New Zealand. Five bathyal sections show no radiolarian mass extinction across a well-defined Cretaceous-Tertiary boundary but, instead, an abrupt increase of diatoms relative to radiolarians, a general increase in both groups, and an influx of spumellarians. A pronounced increase in modal quartz and SiO2 within a 9–25-m-thick basal Paleocene interval indicates high biosiliceous productivity, the silica being derived primarily from diatoms. Enhanced upwelling in response to climatic cooling, or more efficient nutrient cycling related to sea-level changes, may explain this plankton bloom over the first 1 m.y. of the Tertiary.




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