1887
Volume 17, Issue 1
  • E-ISSN: 1365-2117

Abstract

Abstract

The sediments of the Upper Cretaceous to lower Palaeogene Chalk Group were deposited through a wide range of depositional processes. Chalk was originally formed by settlement of coccolithophorid skeletal remains from suspension in the water column, with bottom currents redistributing the sediment shortly after deposition. Locally, tilting of the sea‐floor resulted in mass‐movement of chalk at scales varying from decimetre‐thick turbidites to slumps and slide sheets that were up to hundreds of metres thick. Syn‐depositional tectonic activity, therefore, constituted an important control on chalk facies. To study this relation in more detail, a three‐dimensional (3D)‐seismic stratigraphical analysis was carried out, comparing two study areas that experienced contrasting syn‐depositional tectonic evolutions. The Vlieland offshore area, which underwent gradual subsidence and westward tilting during deposition of the Chalk Group, is characterised by parallel and continuous reflections thought to represent pelagic chalk deposits. In the Dutch Central Graben, which was tectonically inverted during the Late Cretaceous to early Palaeogene, discontinuous and irregular seismic reflections that indicate large‐scale reworking of sediment are found. The improved image quality of 3D‐ vs. 2D‐seismic data allowed us to study the detailed geometry of allochthonous chalk bodies and aided the identification and tracing of the often subtle intra‐Chalk Group unconformities, resulting in a subdivision of the Chalk Group into seven seismic sequences.

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2005-02-28
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