Strata-Bound and Stratiform Iron Sulfides, Sulfur, and Galena in the Miocene Evaporites, Ranga, Red Sea, Egypt (With Special Emphasis on Their Diagenetic Crystallization Rhythmites)

  • M. M. El Aref


The sulfides and sulfur minerals of the Ranga occurrences form three geometric types: (a) strata-bound rhythmic type of pyrite/marcasite associated with cryptalgal calcite, barite, and quartz; (b) stratiform to strata-bound rhythmic type of sulfur associated with anhydrite, calcite, and bitumen; and (c) strata-bound authigenic galena growing in karst cement. The systematic investigations lead to conclude that the iron sulfides and sulfur of the rhythmic types are of syndiagenetic origin, deposited with their gangue associations by generations of fractional crystallization in shallow marine environments. Crystallization processes, corresponding with diagenetic differentiation satisfy the petrographic observations carried out on the karst cement minerals including the authigenic galena crystals. Considering these observations there is no need to assume an unknown outside source which “mineralized” the country rock epigenetically.


Iron Sulfide Shallow Marine Environment Argillaceous Limestone Algal Crust Diagenetic Stage 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1984

Authors and Affiliations

  • M. M. El Aref
    • 1
  1. 1.Geology DepartmentCairo UniversityGizaEgypt

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