Late Neogene Sedimentation in the Black Sea

  1. Albert Matter and
  2. Maurice E. Tucker
  1. Kenneth J. Hsü and
  2. Kerry Kelts

Published Online: 29 JUN 2009

DOI: 10.1002/9781444303698.ch7

Modern and Ancient Lake Sediments

Modern and Ancient Lake Sediments

How to Cite

Hsü, K. J. and Kelts, K. (1978) Late Neogene Sedimentation in the Black Sea, in Modern and Ancient Lake Sediments (eds A. Matter and M. E. Tucker), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303698.ch7

Author Information

  1. Geological Institute, Swiss Federal Institute of Technology, Zürich, Switzerland

  1. Contribution No. 106 of the Laboratory of Experimental Geology, Swiss Federal Institute of Technology, Zürich, Switzerland.

Publication History

  1. Published Online: 29 JUN 2009
  2. Published Print: 24 NOV 1978

ISBN Information

Print ISBN: 9780632002344

Online ISBN: 9781444303698

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Keywords:

  • Black Sea-a part of the ancient Tethys;
  • late Neogene chemical sediments;
  • Laminated chalks- characterized by dark laminae rich in organic matter;
  • Cyclic deposition of chalk;
  • deposition of biogenic calcitic sediments

Summary

Deep-sea drilling penetrated a largely lacustrine sequence more than 1 km thick in the Black Sea. The oldest sediments are Late Miocene black shales, deposited in a brackish water-body, which was a part of the Paratethys lac-mer. The middle (and the bulk) of the penetrated section, ranging from Late Miocene to early Pleistocene in age, was laid down during a time of periodic chemical sedimentation, when calcite, magnesian calcite, aragonite, dolomite, and siderite were precipitated. The youngest sediments are middle to late Quaternary and are largely terrigenous.

The Black Sea was a lake during much of the late Neogene; only rarely was the Black Sea, as it is now, marine brackish, when sea water from the Mediterranean could enter. Calcite chalks were deposited in a deep freshwater lake environmentally similar to the Holocene Lake Zürich. Aragonite and magnesian calcite were laid down in the Black Sea at times when it was brackish-marine or hypersaline. Dolomite muds were precipitated during a period when the Black Sea changed from a brackish lac-mer into a shallow salt lake. Stromatolitic dolomite was formed diagenetically in a sabkha-like environment. Siderite occurred when deep-weathering of low-lying coastal plains resulted in a high influx of dissolved iron to the Black Sea.