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International Journal of Earth Sciences

, Volume 94, Issue 5–6, pp 941–955 | Cite as

Microstructural evolution of deformation-modified primary halite from the Middle Triassic Röt Formation at Hengelo, The Netherlands

  • Zsolt SchléderEmail author
  • János L. Urai
Original paper

Abstract

The microstructure of halite from the subhorizontal, bedded Main Röt Evaporite Member at Hengelo, The Netherlands (AKZO well 382, depth interval of 420–460 m), was studied by transmitted and reflected light microscopy of gamma-irradiation decorated samples. Primary microstructures compare favourably with those found in recent ephemeral salt pans. Large, blocky, fluid-inclusion-poor halite grains and elongated chevrons are interpreted to have formed in the saline lake stage, while void-filling clear halite is interpreted to have formed during the desiccation stage of the salt pan. In addition, in all layers the grains are rich in deformation-related substructures such as slip bands and subgrains indicating strains of a few percent. The study of gamma-irradiation decorated thin sections shows that the main recrystallization mechanism is grain boundary migration. Grain boundary migration removes primary fluid inclusions and produces clear, strain-free new grains. Differential stresses as determined by subgrain size piezometry were 0.45–0.97 MPa. The deformation of the salt layers is probably related to Cretaceous inversion in the area.

Keywords

Hengelo (The Netherlands) Triassic bedded rock salt Synsedimentary structures Deformation microstructures Recrystallization 

Notes

Acknowledgements

The authors thank Wim Paar (Akzo Nobel company) for providing the salt core samples, Manfred Thomé at the Jülich Forschungszentrum for carrying out the gamma-irradiation and H. W. den Hartog (University of Groningen) for helpful discussion on gamma-irradiation. This work was performed as a part of the SPP 1135 project (nr. UR 64/5-1-2), and was financed by the DFG (Deutsche Forschungsgemeinschaft). The manuscript benefited from thorough reviews by Timothy Diggs and Chris Spiers.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Geologie-Endogene DynamikRWTH AachenAachenGermany

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