Writers : Bordbar, A.; Nabi Gorgij, M.; Moussavi Harami, R.; Najafi, M.
Refference : 29th symposium on geosciences
Publishing Year : 1389

Abstract :

Upper Cretaceous deposits in the NW of Nehbandan (Basiran section), consists of 275m conglomerate, alternation of conglomerate-sandstone, sandy limestone -marl and limy marl, marl with intercalation of limestone-sandy limestone thin-bedded and medium-bedded to massive limestone. This succession was deposited in the East margin of Lut Block. Upper Cretaceous deposits overlying, disconformably Jurassic sandstone and shale deposits, and in the some area covered lower Cretaceous deposits with erosion disconformities and overlain by Paleocene conglomerate deposits with angular unconformity. Microfacies analysis led to the recognition of 10 microfacies that are related to 5 belts; tidal flat, lagoon, shoalT shallow open marine and deep open marine environments. With respect to gradual shallow water fades changes, absence of barrier reef, sliding and slumping structure, cortoids, oncoids, pisoids and aggregate grains, that are abundant in rimmed shelves, several evidences shows that carbonate succession of the Basiran section are deposited in the ramp environment. Also due to the great diversity and abundance of larger benthic foraminifera, this carbonate ramp is referred to a Foram- Dominated Carbonate Ramp System.

Subject List : sedimentary Environment