prvi kongres hrvatskih znanstvenika iz domovine i inozemstva - HATZ

PRVI KONGRES HRVATSKIH ZNANSTVENIKA IZ DOMOVINE I INOZEMSTVAZagreb - Vukovar, 15. - 19. studenog 2004.P - 4CLAY MINERALS WITHIN THE CARBONATE SEQUENCES INTINJAN AREA (Istria, Croatia)Barudžija, Uroš; Tadej, Neven; Aljinović; Dunja; Vrkljan, MajaFaculty of Mining, Geology, and Petroleum Engineering, University of Zagreb, CroatiaClayey limestones in the Upper Albian shallow-marine carbonate sequences from Tinjanarea in Istria (Croatia) were investigated. Two layers of clayey limestone (70-90 wt.% ofcalcite) overlay the sequences containing carbonate breccias, interlaminatedpelsparites/ostracodal micrites and cyanobacterial limestones as well as "quartzdiagenetic sediments" (BARUDŽIJA, 2003). Insoluble residues of clayey limestonespredominantly contain illite and/or mixed-layer illite/smectite dominated by illite layers,illite/smectite with higher amount of smectite layers than previous and randomlyinterstratified minerals. Some of other phyllosilicates, probably smectites, are alsopresent. Insoluble residues also contain quartz (10-20wt. %), feldspars (up to 5wt. %) andamorphous material. Since the appearance of the layers with clayey limestones in UpperAlbian sequences in Istria is closely connected with the appearance of "quartz diageneticsediments" (DURN et al., 2003), this mineral assemblage can be indicative of the origin oftheir parent material.Presented on:2nd Mid-European Clay ConferenceMiškolc, Hungary, 20-24.09.2004.Principal Investigator : Dr.sc. Josip TišljarProject No. 01950346