A new stratigraphic framework for the Miocene – Lower Pliocene deposits offshore Scandinavia: A multiscale approach,Geological Journal

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A new stratigraphic framework for the Miocene – Lower Pliocene deposits offshore Scandinavia: A multiscale approach
Geological Journal ( IF 1.4 ) Pub Date : 2020-10-19 , DOI: 10.1002/gj.3982
Karen Dybkjær ₁ , Erik Skovbjerg Rasmussen ₁ , Tor Eidvin ₂ , Kari Grøsfjeld ₃ , Fridtjof Riis ₂ , Stefan Piasecki ₄ , Kasia K. Śliwińska ₁

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Here, we present an updated stratigraphic subdivision of the Oligocene to Pleistocene succession (880–610 m) in the newly proposed type well for the Molo Formation, the industrial 6407/9‐5 well, located on the continental shelf in the eastern Norwegian Sea. Furthermore, new data from the Danish North Sea wells Nora‐1, Vagn‐2, and Tove‐1 are presented. The studied succession in the 6407/9‐5 well is composed of five sedimentary units separated by hiati. The dating of these five units is based on correlation to the stratigraphically more complete Neogene succession in the (Danish) central North Sea area. In this study, a robust stratigraphic framework of these five units, based on a combination of dinoflagellate cysts (dinocyst) stratigraphy and seismic data, is established. The Oligocene succession is referred to the NSO zonation of Van Simaeys et al., Review of Palaeobotany and Palynology, 2005, 134, 105–128, while the Miocene–Pliocene succession is referred to the dinocyst zonation of Dybkjær and Piasecki, Review of Palaeobotany and Palynology, 2010, 161, 1–29. In well 6407/9‐5 the two lowermost units, located below the Molo Formation, comprise a Rupelian (Lower Oligocene) succession up to 803 m, and an Aquitanian/Burdigalian (Lower Miocene) succession from 803 to 787 m, respectively. Both of these units are referred to the Brygge Formation. The Molo Formation is separated from the underlying Brygge Formation by an unconformity. Furthermore, and in contrast to previous studies, our study shows that the Molo Formation (787–703 m) has an unconformity within it. The lower part of the formation (787–724 m) is dated to late Tortonian (Late Miocene), and referred to the Hystrichosphaeropsis obscura dinocyst Zone. The upper part (724–703 m) is dated to Zanclean (Early Pliocene), and referred to the Melitasphaeridium choanophorum dinocyst Zone. The uppermost unit studied (703–670 m) in the well is referred to the Gelasian (Lower Pleistocene) and is included in the Naust Formation. The regional correlation of this stratigraphy with the complete succession in the Danish North Sea reveals that the hiati found in the Miocene succession on the Norwegian Sea shelf are controlled by tectonism, while the internal depositional patterns of the Molo Formation were controlled by eustatic sea‐level changes.

中文翻译：

中新世-下新世新的地层框架–斯堪的纳维亚半岛近海沉积物：一种多尺度方法

在这里，我们介绍了新提议的渐新世至更新世演替的地层细分（880-610 m），该新提议的莫洛组类型井为工业6407 / 9-5井，位于挪威东部海域陆架上。此外，还提供了来自丹麦北海Nora-1，Vagn-2和Tove-1井的新数据。在6407 / 9-5井中，已研究的演替是由5个沉积单元组成的，这些沉积单元被海堤分离。这五个单元的年代是基于与（丹麦）北海中部地层上较完整的新近纪演替的相关性。在这项研究中，建立了这五个单元的稳固地层学框架，并结合了鞭毛藻囊（地壳）地层学和地震数据。《古植物学与孢粉学评论》，2005年，第134页，第105-128页，而中新世—上新世的继承被称为Dybkjær和Piasecki的单囊藻地带，《古植物学与孢粉》评论。，2010，161，1-29。在6407 / 9-5井中，位于莫洛组下面的两个最下部单元分别包括一个长达803 m的Rupelian（下渐新世）演替和一个从803至787 m的Aquitanian / Burdigalian（下中新世）演替。这两个单位都称为布吕格组。莫洛组由于不整合而与下伏的布吕格组分离。此外，与以前的研究相反，我们的研究表明，莫洛组（787-703 m）内部存在不整合面。地层的下部（787-724 m）可追溯到晚Tortonian（晚中新世），并被称为Hystrichosphaeropsis obscura dinocyst Zone。上部（724–703 m）年代为Zanclean（上新世早期），并被称为Melitasphaeridium choanophorum藻囊区。井中研究的最上部单元（703–670 m）被称为Gelasian（下更新世），被包括在Naust组中。该地层与丹麦北海完全演替的区域相关性表明，在挪威海陆架中新世演替中发现的海ati由构造运动控制，而莫洛组的内部沉积模式则受喜人海平面控制。变化。

更新日期：2020-10-19

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