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By Tadeusz Marek Peryt
Attribute examples of evaporite basins, generally of reasonable measurement, are mentioned when it comes to style (playas, continental sabkhas, barred basins), deposits, fossils, relics and pseudomorphs of gypsum came upon, and complicated of diagenesis, e.g. within the purple Sea Miocene the place reef complexes predate the deposition of huge evaporites. versions, the sabkha version and the deep desiccation basin version, are either hired to provide an explanation for the formation of evaporite basins. in lots of circumstances either types has to be mixed as many evaporites have been shaped in subaqueous environments.
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Example text
They are: single idiomorphic quartz (up to I cm) i coarse quartz mosaic ; radiating fibrous quartz crystals fibrous minerals as quartzine and lutecite ; interlocking aggregates of idiomorphic and petaloid quartz associated with spherules or crusts of fibrous varieties. In the anhydritic nodules, the quartz encloses various quantities of anhydrite relics, sometimes so numerous that the crystal boundaries are difficult to distinguish. In tectonic laminated anhydrite with elongated and parallel arranged crystals, the authigenic quartz encloses anhydritic relics which display an irregular or a felted texture typical of early diagenetic anhydrite (Fig.
The example of the Visean anhydMte emphasizes the great importance of the recognition of the anhydrite deformational fabrics as they are similar to sedimentary features and therefore misinterpretations can result. 46 DIA6ENETIC EVOLUTION Important diagenetic changes observed in Visean evaporitic beds in boreholes as well as in outcrops are influenced by multiple controls during the complex depositional evolution of the series ; among them, we can note: depositionat pore-fluid composition, pressure and temperature changes during burial, tectonic deformation, and finally the rote of groudwater with the exhumation of the series This chapter describes the sequence of crystal authigenesis and diagenetic replacements in order to elucidate the impact of each parameter and to recognize them in the residual series after the tectonic deformation and the dissolution.
Day, R. Deletoille,M. Destarac, G. Tortel, Mr L. Ganon for the quality of their assistance in manuscript drafting, reading, typing, photography and thin section making. , 1985. - Geophysique. S. Encyclopaedia Unlversalls, Universalia 1985, p. 273-277. P. , 1981. - Structures anclennes transverses dans le bassln houlller du Nord-Pas-de-Calais. Ann. Soc. geol. , C I, p. tl 7-123. , 1983. - Synthese structurale et paleogeographique du bassln houiller du Nord. Hem. , n ° 123, 68 p. , Hance L. , 1980.