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Liassic sedimentation in Scania, Southern Sweden: Hettangian—Sinemurian of the Helsingborg area

  • Grzegorz Pieńkowski
Article

Summary

During the Hettangian and Sinemurian ages (Lower Jurassic) in Southern Sweden terrigenous, continental, marginal-marine and marine sediments approximately 370 m in thickness were deposited. A detailed analysis of depositional cyclicity, distribution of facies and directions of the sediment transport was carried out. The distribution of fauna, ichnofauna and flora as well as the petrography were analysed. These studies enabled the reconstruction of the palaeoenvironments through time.

Sedimentation of the earliest Jurassic started with fluvial sediments outcropping east of Helsingborg in the Billesholm area. A well-preserved sequence of avulsion-controlled fluvia sedimentation is described. Towards the east the fluvial deposits grade into a lacustrine facies richer in mudstones. These continental sediments are overlain by a marginal-marine association of deltaic facies and superimposed nearshore-offshore facies. The occurrence of these facies is related to the lower Hettangian brackish-marine transgression with a predominace of marginal-marine facies throughout the lower/middle Hettangian. Reconstruction of the deltaic environments with an interaction between fluvial and basinal factors led to the development of characteristic complex deltaic cycles. Regressive trends during the upper Hettangian were responsible for the formation of deltaic-coastal plain facies. A barrierlagoonal area with intra-lagoonal washover channels is present in the transition between the middle and the upper part of the Hettangian profile. At the beginning of the Lower Sinemurian, a stepwise marine transgression started with tidal sediments. The middle part of the Sinemurian is represented by an open marine facies. The upper part of Sinemurian exhibits some regressive trends, the next transgression follows in the uppermost Sinemurian. The development of transgressiveregressive trends in the Scania area bears close similarities to trends in central and northern Poland, the Danish Basin and the island of Bornholm. This development and the palaeontological data suggest that the relative changes of sea level in the Polish Swedish basin must have been approximately coeval during the Earliest Jurassic. A relative sea-level curve of the earliest Jurassic in southern Sweden shows similarities to the revised Exxon curve. Sequence stratigraphy for the earliest Jurassic in Scania indicates three type 2 sequences, three transgressive system tracts and three highstand system tracts. Deposits related to the transgressive and maximum flooding events can be used for correlation, indicating periods of a rapid facies shifting and basin extension. Based on palaeoenvironmental data and sequence stratigraphy, the present interpretation of a change in the position of Hettangian/Sinemurian boundary in Scania is proposed. Tectonic control of transgressive-regressive trends in the Lower Liassic appears to be of subordinate significance in comparison to eustatic control.

Keywords

Marine/Marginal Marine/Continental Basin Siliciclastic Facies Epeiric Basin Eustatic Control Sequence Stratigraphy Scania (Sweden) Jurassic-Liassic (Hettangian-Sinemurian) 

Lias-Sedimentation in Schonen, Südschweden: Hettang/Sinemur im Gebiet von Helsingborg

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© Institut für Paläontologie, Universität Erlangen 1991

Authors and Affiliations

  • Grzegorz Pieńkowski
    • 1
  1. 1.Geological InstituteWarszawaPoland

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