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Regional Subaerial Unconformities in Shallow-Marine Carbonate Sequences of Istria: Sedimentology, Mineralogy, Geochemistry and Micromorphology of Associated Bauxites, Palaeosols and Pedo-Sedimentary Complexes

The Istrian peninsula represents the NW part of the spacious Adriatic Carbonate Platform. This part of the platform is composed of a succession of carbonate deposits more than 2000 m thick of Middle Jurassic (Bathonian) to Eocene age, and is overlain by Palaeogene (Eocene) Foraminiferal limestones, Transitional beds (Globigerina marls) and flysch deposits (Fig. 1). The most important geological structure of the Istrian peninsula is the Western Istrian anticline (POLŠAK & ŠIKIĆ, 1973 ; MARINČIĆ & MATIČEC, 1991), as shown on Fig. 1. According to VELIĆ et al. (1995a) carbonate and flysch deposits of Istria can be divided into four large-scale sequences. The 1st, 2nd and 3rd large-scale sequences are composed of carbonates, each terminated by important, long-lasting emersions, i.e. type 1 sequence boundaries (TIŠLJAR et al., 1998). They are divided into several laterally continuous units exhibiting gradual changes, typical of the facies diversity on carbonate platforms (Fig. 2).

sedimentology, mineralogy, geochemistry, micromorphology, boxites, paleosols, pedo-sedimentary complekses, subaerial unconformities in shallow-marine carbonate sequences of Istria

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