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Geological Society, London, Special Publications; 1989; v. 46; p. 133-139;
DOI: 10.1144/GSL.SP.1989.046.01.13
© 1989 Geological Society of London

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The formation of goethitic ooids in condensed Jurassic deposits in northern Switzerland

A. U. Gehring

Geological Institute, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland

Goethitic ooids from condensed sequences close to the Middle/Upper Jurassic boundary in the Swiss Jura mountains were analysed for texture and chemistry. The sequences are characterized by discontinuities of sedimentation and reworking, which indicate a marine aerobic depositional environment. The ooids consist mainly of isometric goethite particles with apatite and clay mineral flakes. The coexistence of these mineralogical phases can be explained by different adsorption processes due to electrostatic forces or ligand exchange reactions. Both types of processes are discussed and illustrated schematically.





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