The cored Konrad 101 borehole (Cenomanian–Lower Coniacian, Lower Saxony): calibration of surface and subsurface log data for the lower Upper Cretaceous of northern Germany

Niebuhr, Birgit; Wiese, Frank; Wilmsen, Markus

doi:10.1006/cres.2001.0283

Cited by 19 publications

(15 citation statements)

References 21 publications

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“…European‐wide correlation of δ 13 C carb records. From left to right: Anderten (this study), Konrad 101 (stratigraphy after Niebuhr et al ., ), Wunstorf (Mitchell et al ., ), Speeton (UK; Mitchell et al ., ; Jarvis et al ., ), Mont Risou (Vocontian Basin, south‐east France; Gale et al ., ; Bornemann et al ., ; Reichelt, ) and Monte Petrano (Umbria–Marche Basin, Italy; Gambacorta et al ., >0 m; Giorgioni et al ., <0 m). Note that the ACB has been moved in the Gambacorta et al .…”

Section: Resultsmentioning

confidence: 99%

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The Albian–Cenomanian transition and Oceanic Anoxic Event 1d – an example from the Boreal Realm

et al. 2017

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The upper Albian to lower Cenomanian interval in the Hanover area (Germany) is characterized by a well-developed lithological transition from upper Albian monotonous (marly) claystones of several hundred metres thickness, which become enriched in biosilica in the topmost Albian, to increasingly CaCO 3 -rich marls and limestones in the lower and middle Cenomanian. This study presents a new 165 m thick composite record spanning the latest Albian to mid-early Cenomanian (ca 103Á0 to 97Á5 Ma) based on two core drillings at Anderten in the central Lower Saxony Basin (east of Hanover), which is a sub-basin of the North German Basin. Due to the lack or delayed occurrences of Tethyan biostratigraphic markers for the late Albian and early Cenomanian in the Boreal Realm, the definition of the Albian-Cenomanian boundary, as based on the lowest occurrence of Thalmanninella globotruncanoides, is not applicable. In order to overcome this issue, an integrated biostratigraphic-chemostratigraphic approach has been employed. In addition to biostratigraphy (calcareous nannofossils, ostracods, planktonic foraminifera and inoceramids), the Anderten succession has been studied using sedimentary geochemistry (CaCO 3 , total organic carbon, d 13 C and d 18 O), c-ray logging and X-ray fluorescence core scanning. This approach enabled successful correlation of the composite Anderten record to European reference sections in England, south-east France and Italy, as well as to further low-resolution records from the Lower Saxony Basin (Wunstorf and Konrad 101 core). This work has made it possible to identify the d 13 C carb expression of: (i) the Oceanic Anoxic Event 1d; (ii) the Albian-Cenomanian boundary interval; and (iii) potentially the Lower Cenomanian Event(s). Chemostratigraphic age assignments are supported by biostratigraphic results. Calcareous nannofossils indicate an extended Upper Cretaceous 0 (UC0) zone (upper Albian) up to Upper Cretaceous 2 (UC2; upper lower Cenomanian), and the occurrence of the ostracod Physocythere steghausi supports an early Cenomanian age for most of the upper part of the composite record. Notably, influxes of the planktonic foraminifer Thalmanninella aff. reicheli 44 have previously been described from this area and the first appearance of this taxon is usually used to define the base of the middle Cenomanian Substage. However, findings from the Anderten cores and elsewhere suggest that this taxon has an apparently earlier first appearance, questioning previous age assignments from the Boreal Realm solely based on planktonic foraminifera. Due to both moderately well-preserved microfossils and high sedimentation rates, the drilled succession of Anderten is considered as a potential Boreal reference section for the Albian-Cenomanian transition.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the ACBI was identified including the δ 13 C expression of the OAE 1d in the Konrad 101 drill core from Salzgitter south of Brunswick. At this drill site, the isotopically approximated ACB is again well in line with the position of the ultimus/Aucellina transgression (Niebuhr et al ., ).…”

Section: Discussionmentioning

confidence: 97%

The Albian–Cenomanian transition and Oceanic Anoxic Event 1d – an example from the Boreal Realm

et al. 2017

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“…Only in distal sections of the northern Münsterland or the central Lower Saxony Basin (Hannover area), a clayey sediment package ("Bemeroder Schichten", Kemper 1984) documents sedimentation during the Albian-Cenomanian boundary sea-level lowstand (Niebuhr et al 1999;Wilmsen 2003). In proximal and partly also in medial settings, a complex of brown sandstones, glauconitic sandstones, glauconitic marlstones, Niebuhr et al 2001 andWilmsen and and glauconitic marly limestones follows above the transgression horizon, often with a basal clay-ironstone conglomerate (Bärtling 1920;Hiss 1982c). This up to 10 m thick lithological unit, commonly referred to as the Essen Greensand, is a highly diachronous deposit.…”

Section: Standard Sectionmentioning

confidence: 99%

The Cenomanian of northern Germany: facies analysis of a transgressive biosedimentary system

Wilmsen¹,

Niebuhr²,

Hiß

2005

Facies

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A facies analysis of the epicontinental marine Cenomanian sediments of northern Germany shows the presence of 17 facies types (FTs, including several subtypes) which can be assigned to three facies associations: 1) an inner shelf facies association (FT 1-8) with high amounts of terrigenous material and/or high-energy depositional features, 2) a middle shelf facies association (FT 9-15) of predominantly calcareous sediments with moderate amounts of generally fine siliciclastics, and 3) an outer shelf facies association (FT 16-17) of low-energy, fine-grained, pure limestones. These three facies associations roughly correspond to the well-known lithological units of the Cenomanian of northern Germany, i.e., the Essen Greensand/Cenomanian Marls complex, the Pläner Limestones, and the Poor rhotomagense Limestones. The sediments were deposited on a northward-dipping homoclinal ramp with more-or-less shoreline-parallel facies belts. The sediment composition on this ramp-like shelf was a function of the varying importance of three different sediment sources: 1) terrigenous input from the south (Rhenobohemia), generally fining/decreasing in a proximal-distal (i.e., S-N) direction; 2) production of skeletal grains, mainly by macrobenthic organisms; and 3) settling of planktic carbonate (mainly calcispheres and calcareous nannofossils). In response to decreasing water energy with increasing water depth, the seaward decreasing terrigenous influence, and increasing planktic carbonate production, increasingly finer and more calcareous sediments were deposited in a proximal-distal transect. This rather straightforward picture was slightly modified by highest carbonate accumu-M. Wilmsen ( ) · B. Niebuhr

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“…and winnowing of an unconsolidated to partly lithified chalk by a bottom current. The decimetre-scale to metre-scale variations in density and porosity values observed in the log curves can originate from various mechanisms (see Niebuhr & Prokoph, 1997;Scholle et al, 1998;Bramwell et al, 1999;Stage 1999Stage , 2001Niebuhr et al, 2001;Damholt & Surlyk, 2004 for detailed discussions). The thick overlying succession of facies BHC/LC in the lower channel unit reflects vertical aggradation of pelagic chalk within the channel ( Table 2).…”

Section: Facies Association Of the Lower Channel-fill Unitmentioning

confidence: 99%

Channel development in the chalk of the Tor Formation, North Sea

Gennaro

Wonham

2014

From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin

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The cored Konrad 101 borehole (Cenomanian–Lower Coniacian, Lower Saxony): calibration of surface and subsurface log data for the lower Upper Cretaceous of northern Germany

Cited by 19 publications

References 21 publications

The Albian–Cenomanian transition and Oceanic Anoxic Event 1d – an example from the Boreal Realm

The Albian–Cenomanian transition and Oceanic Anoxic Event 1d – an example from the Boreal Realm

The Cenomanian of northern Germany: facies analysis of a transgressive biosedimentary system

Channel development in the chalk of the Tor Formation, North Sea

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