Z2 (Stassfurt) Formation ZEZ2

 

Basin development Fringe development, southern offshore Fringe development, southern onshore
Premise In the Netherlands the unit was first described by Visscher (1955) and it was formally introduced by NAM and RGD (1980) as Zechstein 2 Formation. It is renamed here and amended to include part of the former Fringe Zechstein Formation of NAM and RGD (1980) .
Derivatio nominis Derived from the German stratigraphic nomenclature, where it is applied to the second evaporite cycle Richter-Bernburg (1955) .
Type section Location map See figure (pdf)
  Well Rossum-Weerselo-3 (pdf)
  Location N 52°21’03.5
E 06°54’38.2
  Depth 1331 to 1407 m
  Length 76 m along hole
  Reference NAM and RGD (1980) (sub-basin setting)
Additional section Location map See figure (pdf)
  Well Uithuizermeeden-1 (pdf)
  Location N 53°26’58.9
E 06°48’29.2
  Depth 2548 to 2828 m
  Length 280 m along hole
  Reference NAM and RGD (1980) .(main-basin setting)
  Well P09-01A (pdf)
  Location N 52°32’19.4
E 03°44’52.2
  Depth 4437 to 4500 m
  Length 63 m along hole
  Reference (carbonate/sandstone facies).
  Well Q16-02 (pdf)
  Location N 52°07’05.3
E 04°07’15.3
  Depth 3836 to 3851 m
  Length 15 m along hole
  Reference (sandstone facies).
  Well Buurmalsen-1 (pdf)
  Location N 51°54’18.7
E 05°18’49.2
  Depth 1992 to 2020 m
  Length 28 m along hole
  Reference (claystone/evaporite facies).
Definition The second evaporite cycle of the Zechstein Group, consisting of a carbonate - anhydrite - salt - anhydrite sequence. In the basin-margin setting the formation comprises claystones and sandstones.
Upper Boundary The upper boundary lies below the Grey Salt Clay Member of the Z3 (Leine) Formation, and may be formed by the top of the Z2 Basal Anhydrite Member, the Z2 Salt Member, the Z2 Roof Anhydrite Member or one of the clastic Z2 fringe members.
Lower Boundary The formation comprises the strata between the Z1(Werra) and the Z3 (Leine) Formations. The base of the formation in the basin and sub-basin areas is located at the top of the uppermost anhydrite of the Z1 Upper Anhydrite or Z1 Upper Anhydrite Member respectively. At the fringe of the basin, its lower boundary has been placed at the base of the Red-Brown Salt Clay Member.
Distribution Widespread halite deposition in the main basin and the sub-basins characterize the Z2 (Stassfurt) Formation. The pre-existing topography is responsible for huge variations in thickness. This topography was to a large extent levelled out by the deposition of this formation.
Age Thuringian, Late Permian.
Subdivision  
  In the main basin, the cycle comprises very thick rock salt deposits. In the fringe area, the formation predominantly consists of either sandstones or a sequence of claystone - anhydrite - claystone. A basal claystone unit, the Red-brown Salt Clay Member, is developed only in the sub-basins and on the fringe. The subdivision is as follows:
  ZE Zechstein Group
  ZEZ2 Z2 (Stassfurt) Formation
  ZEZ2T Z2 Roof Anhydrite Member
  ZEZ2H Z2 Salt Member
  ZEZ2A Z2 Basal Anhydrite Member
  ZEZ2C Z2 Carbonate Member
  ZEZ2S Z2 Sandstone Member
  ZEZ2M Z2 Middle Claystone Member
  ZEZ2C Z2 Carbonate Member
  ZEZ2R Red-brown Salt Clay Member
  ZEZ2M Z2 Middle Claystone Member
  ZEZ2F Z2 Fringe Anhydrite Member
  ZEZ2R Red-brown Salt Clay Member
References See References Permian

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].