Mesozoic carbonate rudites, megabreccias and associated deposits from central Greece

Abstract

In the Kokkinovrakhos Formation of central Greece, poorly sorted, grain supported, lithoclastic carbonate rudites, megabreccias and olistoliths are associated with accumulations of fine‐grained laminated carbonates. The laminae frequently exhibit grading and are interpreted as turbidity current deposits. The coarser grained rudites and megabreccias were also redeposited but were probably transported downslope by sliding and rolling, i.e. they are rock‐fall deposits. Olistoliths were emplaced into deeper water by sliding. The fine‐grained sediments of the laminated facies appear to have accumulated in pockets on an uneven sea floor during episodes of minimal rock fall activity. The sedimentary association is similar to that described from some modern fore‐reef environments and is possibly characteristic of accumulations of sediment on, or near to, steep slopes adjacent to carbonate platforms, when episodes of tectonic activity lead to the shearing off and transport downslope of masses of well‐cemented shallow marine carbonates.

Site 685

“…This type of deposit is most common adjacent to scarps that may be related to margin foundering or block-faulting (Johns, 1978). Breccias of this sort can also be associated with largeblock olistostromes, forming talus around blocks (Naylor, 1982).…”

Generic assessment of steep-slope seabed environments; identification of sediment cover and evaluation of swath sonar systems for OTEC site mapping

“…Mud is the predominant sediment on slopes off non-carbonate shelves and off carbonate shelves that lack a barrier reef. The slope (especially the upper slope) seaward of a barrier reef, however, can consist primarily of reef rubble (Johns, 1978;Mullins and Neuman, 1979). Rock outcrops are also common on steep slopes off narrow shelves adjacent to mountainous coasts (Bouma, 1979).…”

Απόθεση - Διαγένεση - Εξέλιξη Πορώδους Των Ιωκαινικών Σχηματισμών Της Προαπούλιας Ζώνης Στη Νήσο Ζάκυνθο

“…Έτσι για παράδειγμα, οι αποθέσεις των ροών θραυσμάτων συχνά καλύπτονται από ένα κανονικά διαβαθμισμένο στρώμα τουρβιδιτικής προέλευσης, προτείνοντας ότι η καθαρή ελαστική συμπεριφορά, όπως αυτή της τουρβιδιτικής ροής, μπορεί να έχει σημαντικό ρόλο στην υποστήριξη των συστατικών τους κατά τη μεταφορά και ιδιαίτερα στα ανώτερα τμήματα της ροής (Davies 1977, Krause and Oldershow 1979, Nardin et al 1979, Lowe 1982, Mullins and Cook 1986). (Carrasco 1977, Enos 1977, Johns 1977, Playford 1980, Kepper 1981, Crevello and Schlager 1980, Schlager and Ginsburg 1981, Eberli 1987, Garcia-Mondejar 1990, Schlager et al 1991, Spence and Tucker 1997.…”