Resumen de Elemental sulfur of bacterial origin in the lacustrine evaporites of the Polatli-Sivrihisar Neogene Basin (Central Anatolia, Turkey)
This study reports occurrences of disseminated elemental sulfur in gypsum of the late Miocene Sakarya Formation in Polath-Sivrihisar Basin, located in the Central Anatolia Neogene Basins. Thin-section and scanning-electron microscope studies indicate that the sulfur minerals have three main morphologies including lacy, combined spheroidal-lobous, and flabellate-grape-like structures. Studies on the elemental sulfur occurrences suggest that the sulfur was formed by reduction of Sakarya Formation gypsum through the metabolic activities of sulphate-reducing bacteria. This observation is also supported by the trace-element concentrations obtained on both the gypsum and the elemental sulfur samples.
