Lutine Formation SGLU


Premise The formation is included in the Scruff Group. It comprises the Clay Deep and Schill Grund members. These members are transferred from the Kimmeridge Formation into the new Lutine Formation, because both were separated chronostratigraphically and geographically from the Kimmeridge Clay Formation. In addition, the characteristic thin dolomite streaks of the Kimmeridge Clay Formation are missing in the Lutine Formation and the latter shows higher GR-log values. The Scruff Greensand Formation separates the Clay Deep and Schill Grund members.
Derivatio nominis Named after the HMS Lutine, a frigate of the Royal British Navy, (although originally a French naval ship, launched at Toulon in 1779) that was wrecked in 1799 in a shallow channel called the IJzergat, which has completely silted up, between the Dutch Wadden islands of Vlieland and Terschelling.
Type section Location map See figure (pdf)
  Well B18-02 (pdf)
  Location N 54°05’35.4"
E 04°47’48.6"
  Depth 2225 to 2315 m
  Length 90 m along hole
  Reference Munsterman et al. (2012)
Additional section Location map See figure (pdf)
  Well F18-02 (pdf)
  Location N 54°04’25.3
E 04°43’48.5
  Depth 2042 to 2079 m
  Length 37 m along hole
  Reference Munsterman et al. (2012)
Definition In the northern part of the Dutch Central Graben the formation consists of brownish- grey to black bituminous claystones (Clay Deep Member). South of blocks F11/F12 the colour changes into olive-grey to grey-brown and the clays become more silty to very fine sandy and less bituminous (Schill Grund Member).
Upper Boundary The upper boundary coincides with the Sequence 3 / Sequence 4 transition sensu Abbink et al. (2006). It is associated with the Late Kimmerian unconformity. The formation is unconformably overlain by the Rijnland, Chalk or Lower North Sea groups. In the northern Dutch Central Graben this boundary is shown by upward decreasing values on the GR and the resistivity logs. In the southern Central Graben  and  Terschelling Basin the top may be more difficult to differentiate on petrophysical  logs.
Lower Boundary In the northern Central Graben the Lutine Formation rests unconformably on the Scruff Greensand or Kimmeridge Clay formations. Occasionally the Lutine Formation may interfinger with the Scruff Greensand Formation. The bituminous shales show a less spiky appearance on the wire-logs (due to the absence of thin dolomite streaks), and higher values on the GR and resistivity readings than the underlying Kimmeridge Clay Formation. The boundary with the glauconitic Scruff Greensand Formation in the southern part of the Central Graben and Terschelling Basin is conformable.
Distribution The Lutine Formation is widely present in the Central Graben (except in blocks F08 and F14), Step Graben, Schill Grund Platform and Terschelling Basin (see Fig.). The formation grades partially into the Scruff Greensand Formation and Zurich Formation towards the south (southern Central Graben and Vlieland Basin). In the north the lateral equivalents of  the Lutine Formation are the ‘Hot Unit’ of the Farsund Formation (Danish sector) and the Mandal Formation (Norwegian sector of the Central Graben; Michelsen & Wong, 1991) (see pdf).
Age Sequence 3 sensu Abbink et al. (2006): Ryazanian. The age of the base is diachronous;. it has an Early Ryazanian age (runctoni Ammonite Zone) in the northernmost part of the Central Graben (B18 and F03 blocks) and is dated around the Early/Late Ryazanian boundary (kochi/icenii Ammonite zones, or younger) in the south.
Depositional Setting Basin circulation stagnated in the northernmost part of the basin, which resulted in dysoxic to anoxic basin-floor conditions and in the deposition and preservation of bituminous claystones. To the south relatively shallower, open marine circumstances occurred with (near) normal basin-floor ventilation. Overall the claystones are more silty or finely sandy and only slightly bituminous.
Subdivision Two members are newly differentiated:
  SG Scruff Group
  SGLU Scruff Greensand Formation
  SGLUS Stortemelk Member
  SGLUC Scruff Spiculite Member
References See References Upper Jurassic/ Lower Cretaceous

D.K. Munsterman, R.M.C.H. Verreussel, H.F. Mijnlieff, N. Witmans, S. Kerstholt-Boegehold & O.A, Abbink (2012), Revision and update of the Callovian-Ryazanian Stratigraphic Nomenclature in the northern Dutch Offshore, i.e. Central Graben Subgroup and Scruff Group. Netherlands Journal of Geosciences-Geologie en Mijnbouw, 91 (4):555-590.
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