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Agglutinated Foraminiferal Stratigraphy of Middle Jurassic to Basal Cretaceous Shales, Central Spitsbergen

  • Jenö Nagy
  • Magne Löfaldli
  • Sven A. Bäckström
  • Halvor Johansen
Chapter
Part of the NATO ASI Series book series (ASIC, volume 327)

Abstract

Foraminiferal distribution data have been used for stratigraphic zonation of a c. 230 m thick sedimentary series comprising the Agardhfjellet and basal Rurikfjellet formations (Callovian to Ryazanian) in central Spitsbergen. The dominant lithologies are organic-rich shales, but siltstones and silty shales with intermediate and low organic content also occur.

The faunas consist almost exclusively of agglutinated taxa, with significant amounts of calcareous forms restricted to a single (Ryazanian) horizon. Altogether, 44 agglutinated and 10 calcareous (Lagenid) species are recorded. The faunal succession is subdivided into eight zones. Age assignments of these are based on regional correlations of foraminiferal occurrences, and macrofaunal associations.

The proposed foraminiferal zones include: (1) Trochammina rostovzevi Zone — Callovian; (2) Recurvoides disputabilis Zone — Oxfordian; (3) Haplophragmoides canuiformis Zone — Lower and Upper Kimmeridgian; (4) Trochammina rosacea Zone — uppermost Kimmerid-gian and Lower Volgian; (5) Ammodiscus zaspelovae Zone — Middle Volgian; (6) Trochammina aff. abrupta Zone — Middle and Upper Volgian; (7) Recurvoides obskiensis Zone — Upper Volgian and lowermost Ryazanian; (8) Gaudryina aff. milleri Zone — Ryazanian.

Spitsbergen and other areas of the Boreal Realm (western Siberia, the northern North Sea, Sverdrup Basin and western Canada) show an increased development of agglutinated assemblages in Middle Jurassic to Early Cretaceous time. Regionally reduced availability of calcium carbonate associated with locally stagnant conditions are considered critical for this development.

Keywords

Lower Cretaceous Middle Jurassic Silty Shale Jurassic Deposit Boreal Realm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1990

Authors and Affiliations

  • Jenö Nagy
    • 1
  • Magne Löfaldli
    • 2
  • Sven A. Bäckström
    • 3
  • Halvor Johansen
    • 1
  1. 1.Department of GeologyUniversity of OsloBlindernNorway
  2. 2.Stratlab A/SSkjettenNorway
  3. 3.SAGA Petroleum AS.SandvikaNorway

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