The pre-breakup stratigraphy and petroleum system of the Southern Jan Mayen Ridge revealed by seafloor sampling

Stéphane Polteau* (Corresponding Author), Adriano Mazzini, Geir Hansen, Sverre Planke, Dougal A. Jerram, John Millett, Mansour M. Abdelmalak, Anett Blischke, Reidun Myklebust

*Corresponding author for this work

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Abstract

The Jan Mayen Microplate Complex (JMMC) in the NE Atlantic is interpreted to mostly consist of continental fragments with possible interstitial embryonic oceanic crust. A complex Cenozoic rifting history accompanied by extensive extrusive and intrusive volcanism have made the geological characterization of the JMMC challenging especially due to poor seismic imaging beneath the breakup basalt succession. The presence of continental crust in the JMMC is inferred by seismic and magnetic data, but ground truthing evidence have yet to be provided. Here, we present the results from a seafloor sampling campaign undertaken in 2011 on the Southern Jan Mayen Ridge complex. Seabed samples were recovered using a gravity corer and a dredge along a 1000 m high escarpment with a 19° slope. Sampling locations were selected based on the interpretation of seismic profiles that suggest the presence of possible pre-breakup successions outcropping along this steep escarpment. Results include a sequence of samples with age diagnostic palynomorph assemblages ranging from Permian/Triassic to Eocene, and including igneous samples related to the Early Eocene breakup volcanism. Importantly, the samples were retrieved from hard substrate in an erosional gully lacking overburden sediments and have ages arranged in younging upward sequential order, supporting their near in-situ position. The sampling results were integrated into a lithostratigraphic pseudo-well that can be used to constrain the evolution and breakup of the JMMC. Additionally, evidence for active migration of Jurassic sourced hydrocarbons comprise the first indication of a working hydrocarbon system, with important implications for the petroleum prospectivity of the Dreki area. Finally, these results confirm that the Southern Jan Mayen Ridge is indeed a sliver of continental crust.

Original languageEnglish
Pages (from-to)152-164
Number of pages13
JournalTectonophysics
Volume760
Early online date30 Apr 2018
DOIs
Publication statusPublished - 5 Jun 2019

Keywords

  • Breakup
  • Jan Mayen microplate complex
  • Jurassic
  • NE Atlantic
  • Petroleum system
  • Pre-breakup
  • Seafloor sampling
  • Sub-basalt

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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    Polteau, S., Mazzini, A., Hansen, G., Planke, S., Jerram, D. A., Millett, J., Abdelmalak, M. M., Blischke, A., & Myklebust, R. (2019). The pre-breakup stratigraphy and petroleum system of the Southern Jan Mayen Ridge revealed by seafloor sampling. Tectonophysics, 760, 152-164. https://doi.org/10.1016/j.tecto.2018.04.016