16. Distribution of Calcareous Nannoplankton in Oligocene to Holocene Sediments of the Red Sea and the Indian Ocean Reflecting Paleoenvironment

  1. J.R. Heirtzler,
  2. H.M. Bolli,
  3. T.A. Davies,
  4. J.B. Saunders and
  5. J.G. Sclater
  1. Carla Müller

Published Online: 23 MAR 2013

DOI: 10.1029/SP009p0371

Indian Ocean Geology and Biostratigraphy

Indian Ocean Geology and Biostratigraphy

How to Cite

Müller, C. (1977) Distribution of Calcareous Nannoplankton in Oligocene to Holocene Sediments of the Red Sea and the Indian Ocean Reflecting Paleoenvironment, in Indian Ocean Geology and Biostratigraphy (eds J.R. Heirtzler, H.M. Bolli, T.A. Davies, J.B. Saunders and J.G. Sclater), American Geophysical Union, Washington, D. C.. doi: 10.1029/SP009p0371

Author Information

  1. Geolog.-Paläontolog. Institut, Johann-Wolfgang Goethe–Universität, Senckenberg-Anlage 32-34, 6000 Frankfurt a/M, West Germany

Publication History

  1. Published Online: 23 MAR 2013
  2. Published Print: 1 JAN 1977

ISBN Information

Print ISBN: 9780875902081

Online ISBN: 9781118664919

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Summary

Results of the nannoplankton investigations of Oligocene to Holocene sediments from 52 sites, drilled in the Indian Ocean (Fig. 1, Fig.2) during the Deep Sea Drilling Project (Leg 22 to Leg 29) are presented.

Nannofossils are the main constituent of the pelagic sediments, especially the Cenozoic chalks and oozes, covering the ridges and deep basins of the Indian Ocean. Their distribution and preservation in the sediments recovered from the different sites is closely related to depositional conditions reflecting the paleoenvironment which in turn is strongly connected with the tectonic evolution of the Indian Ocean.

Nannoplankton assemblages of low- and mid-latitude regions of the Indian Ocean are similar. A decrease in frequency of some groups (discoasters, ceratoliths, sphenoliths) can be observed in mid-latitudes. However, most index fossils occur also there. This makes it possible to use the same zonation in nearly all parts of the Indian Ocean. Assemblages of high-latitudes or areas influenced by the Circumpolar Current (Crozet Basin) are distinguished by low species diversity, thus a modified zonation must be used.