Fabric development and the smectite to illite transition in Upper Cretaceous mudstones from the North Sea: an image Analysis Approach

2005 ◽  
Vol 249 (1) ◽  
pp. 103-114 ◽  
Author(s):  
R. H. Worden ◽  
D. Charpentier ◽  
Q. J. Fisher ◽  
A. C. Aplin
Keyword(s):  
Image Analysis ◽  
North Sea ◽  
Upper Cretaceous ◽  
Analysis Approach ◽  
The North ◽  
The North Sea

scholarly journals Stratigraphy of Maastrichtian Foraminiferida from the United Kingdom; the Maastrichtian of Norfolk

2003 ◽  
Vol 82 (3) ◽  
pp. 233-245 ◽  
Author(s):  
M. Hart ◽  
T. Swiecicki
Keyword(s):  
United Kingdom ◽  
North Sea ◽  
Upper Cretaceous ◽  
North Coast ◽  
Flood Basalts ◽  
Glacial Sediments ◽  
The North ◽  
The United Kingdom ◽  
The North Sea ◽  
Atlantic Margin

AbstractOnshore Maastrichtian strata in the United Kingdom are limited to a few small, isolated blocks of chalk floating within glacial sediments on the Norfolk coast. Isolated outcrops of Campanian and Maastrichtian chalks used to be available around Norwich but the majority of these exposures are now badly degraded. Offshore, in the North Sea Basin, there are complete chalk successions that range throughout the Upper Cretaceous and Lower Cenozoic. There is a limited succession of Maastrichtian chalks exposed on the north coast of Northern Ireland below the Cenozoic flood basalts. In the Western Approaches Basin, Maastrichtian and Danian chalks are known from exploration wells and core samples. West of the United Kingdom a number of DSDP/ODP boreholes have penetrated the Upper Cretaceous succession.Beginning in the Cenomanian, in southeast England, the whole of the Upper Cretaceous is within the chalk facies, possibly one of the longest intervals of relatively stable environment in the geological record. The Foraminiferida of the chalk have been studied for more than a hundred years and therefore the fauna is exceptionally well known and fully documented. Fifty years ago, the benthonic Foraminiferida were identified as having the potential to provide a viable zonation of the chalk facies and we now have precise, cross-basinal correlation using these taxa.The planktonic fauna is restricted by both palaeolatitude and water depth. The latter appears to be the most influential as the faunas from onshore are more limited than those recorded from the deeper waters of the North Sea Basin and the Atlantic Margin. Even with this restricted fauna, however, it is still possible to develop a general correlation with the standard Tethyan zonation based on planktonic taxa.

scholarly journals Mid-Paleocene palaeogeography of the Danish area

2002 ◽  
Vol 49 ◽  
pp. 171-186
Author(s):  
Ole R. Clausen ◽  
Mads Huuse
Keyword(s):  
North Sea ◽  
Upper Cretaceous ◽  
Marked Change ◽  
Tectonic Uplift ◽  
The North ◽  
Central Trough ◽  
Regional Tectonic ◽  
The North Sea

At the Danian/Selandian transition the North Sea Basin experienced a marked change, from deposition of almost pure carbonate during the Upper Cretaceous and Danian to deposition of greensand, marl and clay during the Selandian. Erosional features at the Top Chalk surface and the occurrence of an overlying conglomerate (transgressive lag deposit) indicates that large parts of the Danish area were subaerially exposed at the Danian/Selandian transition, probably due to regional tectonic uplift. Tectonically induced inversion of fault trends in the Central Trough and the Sorgenfrei- Tornquist Zone and differential relative subsidence between the Ringkøbing-Fyn High and the Norwegian-Danish Basin strongly affected the distribution of the lower Selandian sediments. Three palaeogeographic maps are presented to illustrate the various stages of the early Selandian transgression in order to demonstrate the mid-Paleocene evolution of the Danish area.

scholarly journals A new method for bulk palynological processing of oil-contaminated chalks

1991 ◽  
Vol 10 (2) ◽  
pp. 202-202 ◽  
Author(s):  
Ingerlise Nørgaard ◽  
Anne-Marie Rasmussen ◽  
Poul Schiøler ◽  
Svend Stouge
Keyword(s):  
North Sea ◽  
Hydrofluoric Acid ◽  
Acid Treatment ◽  
Upper Cretaceous ◽  
Treatment Process ◽  
Reaction Vessel ◽  
Geological Survey ◽  
Large Sample Size ◽  
The North ◽  
The North Sea

Abstract. INTRODUCTIONThe application of palynomorphs in well-site dating and correlation within the Upper Cretaceous—Danian Chalk Group of the North Sea, is currently being investigated at the Geological Survey of Denmark. Due to the relatively low abundance of palynomorphs in the chalks, a large sample size (100–300g) is often needed to obtain representative microfloras. Palynological preparation of large chalk samples does, however, create processing problems, especially if the samples derive from oil bearing intervals. The aim of this note is to describe a method developed at the Geological Survey of Denmark to overcome these processing problems.PROBLEMS IN THE PREPARATION OF LARGE CHALK SAMPLES.The problems during the preparation process comprise the following factors: The dissolution of carbonates from 100—300g sized chalk samples with hydrochloric acid causes a vigorous reaction that developes vast amounts of foam. The foam development is usually controlled by spraying alcohol or the more hazardous acetone into the reaction vessel; these solvents reduce the vigorous expansion of the foam by reducing the surface tension of the acid. This procedure, however, demands constant surveillance of the acid treatment, because the effect of the solvents is of short duration. Furthermore, the initial vigorous reaction restricts the use of stronger, more effective hydrofluoric acid concentrations to later parts of the acid treatment process, where the reaction is more calm. In the Danish sector of the North Sea, the main producing reservoir is situated in the Chalk Group. Core samples from the Chalk Group are therefore usually usually oil bearing . . .

scholarly journals Stratigraphie architecture of the Upper Cretaceous and Cenozoic along the southern border of the North Sea Basin in Belgium

2004 ◽  
Vol 83 (3) ◽  
pp. 155-171
Author(s):  
N. Vandenberghe ◽  
S. Van Simaeys ◽  
E. Steurbaut ◽  
J.W.M. Jagt ◽  
P. J. Felder
Keyword(s):  
North Sea ◽  
Late Cretaceous ◽  
Upper Cretaceous ◽  
Control Mechanisms ◽  
Time Intervals ◽  
The North ◽  
Tectonic Events ◽  
Geological Information ◽  
The North Sea ◽  
Southern Border

AbstractThe Late Cretaceous and Cenozoic sedimentary record in the Campine Basin along the southern border of the North Sea Basin is analysed in terms of sequence stratigraphy. All available biostratigraphic, and in some cases, magnetostratigraphic data are used to constrain the sequence chronostratigraphy. The relative geographic extent of the strata is used as an indication of the relative sea level. Tectonic and eustatic components could be distinguished in several cases using regional geological information. Generally, sequences consist of transgressive and highstand systems tracts only and have flat, abrasion-type lower boundaries. Lowstand deposits are only identified as infill of erosional space, which generally implies marked tectonic uplift. Several eustatic and tectonic events can be correlated with similar events known elsewhere in the North Sea Basin. The time intervals spanned by the different sequences vary considerably, pointing out different control mechanisms.

scholarly journals Seismic geomorphology and origin of diagenetic geobodies in the Upper Cretaceous Chalk of the North Sea Basin (Danish Central Graben)

2018 ◽  
Vol 30 (5) ◽  
pp. 895-925 ◽  
Author(s):  
F. W. H. Smit ◽  
F. S. P. van Buchem ◽  
J. C. Holst ◽  
M. Lüthje ◽  
K. Anderskouv ◽  
...  
Keyword(s):  
North Sea ◽  
Upper Cretaceous ◽  
The North ◽  
Seismic Geomorphology ◽  
The North Sea

scholarly journals Stratigraphic architecture of the Upper Cretaceous and Cenozoic along the southern border of the North Sea Basin in Belgium

2004 ◽  
Vol 83 (3) ◽  
pp. 155-171 ◽  
Author(s):  
N. Vandenberghe ◽  
S. Van Simaeys ◽  
E. Steurbaut ◽  
J.W.M. Jagt ◽  
P.J. Felder
Keyword(s):  
North Sea ◽  
Upper Cretaceous ◽  
Control Mechanisms ◽  
Time Intervals ◽  
The North ◽  
Tectonic Events ◽  
Stratigraphic Architecture ◽  
Geological Information ◽  
The North Sea ◽  
Southern Border

AbstractThe Late Cretaceous and Cenozoic sedimentary record in the Campine Basin along the southern border of the North Sea Basin is analysed in terms of sequence stratigraphy. All available biostratigraphic, and in some cases, magnetostratigraphic data are used to constrain the sequence chronostratigraphy. The relative geographic extent of the strata is used as an indication of the relative sea level. Tectonic and eustatic components could be distinguished in several cases using regional geological information. Generally, sequences consist of transgressive and highstand systems tracts only and have flat, abrasion-type lower boundaries. Lowstand deposits are only identified as infill of erosional space, which generally implies marked tectonic uplift. Several eustatic and tectonic events can be correlated with similar events known elsewhere in the North Sea Basin. The time intervals spanned by the different sequences vary considerably, pointing out different control mechanisms.

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