A condensed chalk–marl succession on an Early Cretaceous intrabasinal structural high, Danish Central Graben: Implications for the sequence stratigraphic interpretation of the Munk Marl Bed
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The Deep Adda-1 well in the Danish Central Graben, North Sea, provides a record of mid-Cretaceous sedimentation on the eastern flank of the intrabasinal Adda–Tyra inversion high. An upper Hauterivian – lower Barremian core in the Tuxen Formation spans the lower boundary of the laminated organic-rich Munk Marl Bed (MMB), a key marker bed in North Sea Cretaceous stratigraphy. Multidisciplinary sedimentological–biostratigraphic–palaeoecological data document the abrupt environmental shift at this boundary. The upper Hauterivian – lowermost Barremian lower Tuxen Formation (nannozones BC10 – lowermost BC14), beneath the MMB, represents a well-ventilated, current-swept setting supporting a diverse benthic fauna and characterized by a condensed succession with hardgrounds, at one level defining a biostratigraphic hiatus, and stacked, thin shallowing-upward parasequences. The succeeding lower Barremian MMB (nannozone BC14) attests to poorly oxygenated bottom waters and a total lack of epi- and infauna; the calm, inhospitable sea floor was intermittently disturbed by muddy turbidity currents and debris flows. The base-MMB surface is a complex fractured hardground indicative of relative sea-level fall and protracted winnowing of the cemented sea floor. The Deep Adda-1 core thus records a sea-level excursion that accompanied the onset of early Barremian oxygen depletion in concert with additional potential forcing factors such as coeval volcanism and watermass warming.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 106234 |
| Tidsskrift | Sedimentary Geology |
| Vol/bind | 440 |
| Antal sider | 24 |
| ISSN | 0037-0738 |
| DOI | |
| Status | Udgivet - 2022 |
Bibliografisk note
Funding Information:
The research leading to these results has received funding from the Danish Offshore Technology Centre (Technical University of Denmark) under the Tight Reservoir Development Lower Cretaceous programme. We gratefully acknowledge the Danish Underground Consortium (TotalEnergies E&P Denmark, Noreco & Nordsøfonden) for granting the permission to publish this work. We would also like to thank TotalEnergies in particular for access and generous support at their core facilities, and GEUS personnel Carsten Guvad, Annette Ryge, Charlotte Olsen and Jette Halskov for professional laboratory and graphical support. The 3D Imaging Center at the Technical University of Denmark is gratefully acknowledged for providing access to X-ray tomography equipment. We thank Marcos Aurell and Emad Nagm for their pertinent, constructive reviews which significantly improved the paper.
Funding Information:
The research leading to these results has received funding from the Danish Offshore Technology Centre (Technical University of Denmark) under the Tight Reservoir Development Lower Cretaceous programme. We gratefully acknowledge the Danish Underground Consortium (TotalEnergies E&P Denmark, Noreco & Nordsøfonden) for granting the permission to publish this work. We would also like to thank TotalEnergies in particular for access and generous support at their core facilities, and GEUS personnel Carsten Guvad, Annette Ryge, Charlotte Olsen and Jette Halskov for professional laboratory and graphical support. The 3D Imaging Center at the Technical University of Denmark is gratefully acknowledged for providing access to X-ray tomography equipment. We thank Marcos Aurell and Emad Nagm for their pertinent, constructive reviews which significantly improved the paper.
Publisher Copyright:
© 2022 Elsevier B.V.
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