Diagenetic changes in evaporites deposits of Kosovo polje, Knin : master's thesis

Evaporiti u Dinaridima uglavnom se sastoje od gipsa i anhidrita i asocirani su u s karbonatima, klastitima i splilitiziranim magatskim stijenama. Prema palinološkim analizama (Šušnjara i dr., 1992) i analizama sumpornih izotopa u gipsu i anhidritu (Šiftar, 1986) dinaridski evaporiti taloženi su tijekom mlađeg perma, u lagunarnom, sabkha – tipu okoliša. Cilj ovog diplomskog rada je utvrditi tip i stupanj dijagenetskih promjena u evaporitnom ležištu Kosovo polje, Knin. Na temelju makroskopske determinacije slijeda naslaga i mikroskopske analize iz dvanaest bušotina izrađeni su geološki stupovi s generalno podijeljenim zonama na gipsnu, gips–anhidritnu prijelaznu zonu i anhidritnu zonu. Kemijske i XRD analize dale su podatke o sastavu krovine za četiri reprezentativna uzorka. U okviru ovog diplomskog rada fluidne inkluzije opisane su i determinirane samo petrografski. Odnosima mikrostruktura gipsa i anhidrita te pratećim dolomitom utvrđen je slijed dijagenetskih procesa u evaporitima istraživanog područja te je dana pretpostavka o načinu kretanja supersaturiranih slanih otopina na temelju reliktnih kalupa halita i tankih proslojaka organske tvari ispunjene krupnokristalastim karbonatom i sitnokristalastim halitom.Abstract: Evaporite rocks within Dinarides consist of gypsum and anhydrite and are associated with various types carbonate, clastics and spilitized igneous rocks. According to palinological analysis (Šušnjara et al., 1992) and sulfur isotopes analysis within gypsum and anhydrite (Šiftar, 1986), Dinaridic evaporites are deposited during Upper Permian time, in lagoonal, sabkha–type environment. The aims of this diploma thesis is to determine types and stages of diagenetic changes within evaporite deposit of the Kosovo polje, Knin. Geological columns are constructed based on macroscopic and microscopic observations. Generally, there are three zones: gypsum zone, transition gypsum-anhydrite zone and anhydrite zone. Chemical and XDR analysis are performed at four representative samples of theoverlying rocks . Fluid inclusion are determinate petrographicaly. Relation between microstructure of gypsum and anhydrite and accompanying various types dolomite shows digenetic sequence. Existence of supersaturated solution is related to diagenetic processes, according to relict halite molds and thin layers of organic matter filled with coarse crystalline carbonate and finely crystalline halite