Stratigraphy of the Upper Jurassic to lowermost Cretaceous in the Rødryggen-1 and Brorson Halvø-1 boreholes, Wollaston Forland, North-East Greenland
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Stratigraphy of the Upper Jurassic to lowermost Cretaceous in the Rødryggen-1 and Brorson Halvø-1 boreholes, Wollaston Forland, North-East Greenland. / Alsen, Peter; Piasecki, Stefan; Nøhr-Hansen, Henrik; Pauly, Sebastian; Sheldon, Emma; Hovikoski, Jussi.
In: GEUS Bulletin, Vol. 55, 8342, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Stratigraphy of the Upper Jurassic to lowermost Cretaceous in the Rødryggen-1 and Brorson Halvø-1 boreholes, Wollaston Forland, North-East Greenland
AU - Alsen, Peter
AU - Piasecki, Stefan
AU - Nøhr-Hansen, Henrik
AU - Pauly, Sebastian
AU - Sheldon, Emma
AU - Hovikoski, Jussi
N1 - Publisher Copyright: © 2023, GEUS - Geological Survey of Denmark and Greenland. All rights reserved.
PY - 2023
Y1 - 2023
N2 - Two shallow cores drilled in northern Wollaston Forland, North-East Greenland, provide a combined section covering the upper Kimmeridgian (Upper Jurassic) – Barremian (Lower Cretaceous) and comprising the Bernbjerg, Lindemans Bugt, Palnatokes Bjerg and Stratumbjerg Formations. A new lithostratigraphic unit, the Storsletten Member, is defined within the Lindemans Bugt For-mation. The black mudstone-dominated intervals are dated primarily by dinoflagellate cysts and ammonites, whereas the calcareous mudstones of the Palnatokes Bjerg Formation – sandwiched between the black mudstones – are dated by calcareous nannofossils. The stratigraphy demon-strates an almost complete succession in the Rødryggen-1 core, representing a deeper position in the basin, where the hiatus at the latest Jurassic rift climax predicted in previous models for the eastern Wollaston Forland Basin is absent. In contrast, the Brorson Halvø-1 core represents a position closer to a block crest where unconformities developed. In combination, the cores provide a key biostratigraphic reference section for the Jurassic–Cretaceous boundary interval in the Arctic.
AB - Two shallow cores drilled in northern Wollaston Forland, North-East Greenland, provide a combined section covering the upper Kimmeridgian (Upper Jurassic) – Barremian (Lower Cretaceous) and comprising the Bernbjerg, Lindemans Bugt, Palnatokes Bjerg and Stratumbjerg Formations. A new lithostratigraphic unit, the Storsletten Member, is defined within the Lindemans Bugt For-mation. The black mudstone-dominated intervals are dated primarily by dinoflagellate cysts and ammonites, whereas the calcareous mudstones of the Palnatokes Bjerg Formation – sandwiched between the black mudstones – are dated by calcareous nannofossils. The stratigraphy demon-strates an almost complete succession in the Rødryggen-1 core, representing a deeper position in the basin, where the hiatus at the latest Jurassic rift climax predicted in previous models for the eastern Wollaston Forland Basin is absent. In contrast, the Brorson Halvø-1 core represents a position closer to a block crest where unconformities developed. In combination, the cores provide a key biostratigraphic reference section for the Jurassic–Cretaceous boundary interval in the Arctic.
KW - ammonite stratigraphy
KW - calcareous nannofossil stratigraphy
KW - Jurassic–Cretaceous boundary
KW - palynostratigraphy
KW - Storsletten Member
U2 - 10.34194/geusb.v55.8342
DO - 10.34194/geusb.v55.8342
M3 - Journal article
AN - SCOPUS:85180727846
VL - 55
JO - GEUS Bulletin
JF - GEUS Bulletin
SN - 2597-2162
M1 - 8342
ER -
ID: 379033580