Cyclic Sedimentation in a Large Wave- and Storm-Dominated Anoxic Lake; Kap Stewart Formation (Rhaetian-Sinemurian), Jameson Land, East Greenland

  1. Henry W. Posamentier3,
  2. Colin P. Summerhayes4,
  3. Bilal U. Haq5 and
  4. George P. Allen6
  1. G. Dam1 and
  2. F. Surlyk2

Published Online: 15 APR 2009

DOI: 10.1002/9781444304015.ch21

Sequence Stratigraphy and Facies Associations

Sequence Stratigraphy and Facies Associations

How to Cite

Dam, G. and Surlyk, F. (1993) Cyclic Sedimentation in a Large Wave- and Storm-Dominated Anoxic Lake; Kap Stewart Formation (Rhaetian-Sinemurian), Jameson Land, East Greenland, in Sequence Stratigraphy and Facies Associations (eds H. W. Posamentier, C. P. Summerhayes, B. U. Haq and G. P. Allen), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304015.ch21

Editor Information

  1. 3

    Plano, Texas, USA

  2. 4

    Godalming, UK

  3. 5

    Washington, DC, USA

  4. 6

    St Remy les Chevreuses, France

Author Information

  1. 1

    Geological Survey of Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

  2. 2

    Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

Publication History

  1. Published Online: 15 APR 2009
  2. Published Print: 17 NOV 1993

ISBN Information

Print ISBN: 9780632035489

Online ISBN: 9781444304015

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Keywords:

  • cyclic sedimentation in large wave and storm-dominated anoxic lake - Kap Stewart Formation (Rhaetian-Sinemurian), Jameson Land, East Greenland;
  • sediments of Kap Stewart Formation - open-lacustrine, delta-front, delta-plain, alluvial-plain and delta-abandonment facies associations;
  • coarse-grained symmetrical ripples - interbedded with fine grained storm sandstones and open-lacustrine mudstones;
  • delta-front fades association;
  • wave- and storm-dominated shoreface;
  • delta-plain fades association;
  • alluvial-plain facies association;
  • geometry and internal organization of delta-front sandstones;
  • provenance, current and wave-ripple patterns

Summary

During Rhaetian–Sinemurian times a large wave- and storm-dominated lake was situated in the Jameson Land Basin, East Greenland. Sandy and pebbly alluvial material was transported into the lake from source areas to the east, west and north. Lake deposits consist of alternating black unfossiliferous mudstones and sheet sandstones. Anoxic conditions dominated at the lake bottom during deposition of the muds and the relatively deep-water column probably was stratified. The sandstones were deposited during progradation of wave- and storm-dominated deltas in a water depth less than 15 m. A high-resolution sequence-stratigraphic interpretation of the succession suggests that the mudstones were deposited in periods of rising and large highstands of lake level, whereas progradation of the deltaic sheet sandstones took place during forced regressions, caused by significant falls. The lake thus experienced abundant high-frequency and fairly high-amplitude changes in level. These high-frequency lake-level changes may reflect Milankovitch-type climatic cycles. The high-frequency cycles can be grouped into a number of low-frequency cycles. These cycles show the same number of large-scale high- and lowstand points as published eustatic sea-level curves for the Rhaetian–Sinemurian, and it is suggested that the long-term trends in lake level mirrored and probably were controlled by eustasy. The lake-level curve is accordingly interpreted to show a high-periodicity climatically induced signal superimposed on a long-periodicity eustatic signal. A sequence-stratigraphic analysis of the Kap Stewart Formation shows that it consists of two third-order sequences with a maximum duration of 15 to 20 Ma.