Facies and sedimentary environment of cretaceous units at north west of Dihuk – Tabas region(Shotori mountain range)

An investigation was made on the facise and sedimentary environment of upper cretaceous rocks at north west of shotor mountatin range at dihuk-tabasregion.this studi has alsi covered carving lime sidments mainly being micritic and sparits with fossl(bioclast)markings,such as:Echinoderm,alga,lamelibransch,brachiopodoand sparation of 10 carbing facies as follow:Group of open marine facies that include 1-Bioclastic mudstone,2-Bioclastic wackstone,3_Biocastic packstone,group of barrier facies that inclde4_Bioclastic packstone,5_Grainstone packsone,Group of lagoon facies that incude,6_Bioclastic packstone7_peloid wackston,Grouup of continetal facies that include8_Litharenite, 9_sub_litharenite and 10_Gerywacki.By interpretation and analysis of these microfaciies and their related environnment we shall be able to recognize the old geographical (palaeobiogeographic) condition in this region wich has provento have been a ramp type carbonate platform with a nearly uniform slope (homodinal ramp).transversal distaces vertical to the strata.the specimens wich were made into thin cut pieces underwent precise lithological studies thereby their different elements were distinguished and separted. By synthesizing the folk (1973) and aunhum(1962)approache, the facies were given titles.This paper is a part of a research on lithological attributes,sedimentary facies and environmental aspects of the formation of cretaceous sediments and rocks at the region under investiation.

کلیدواژه ها:

Sedimentology ، Mount Shotori ، Dihuk - Tabas Lithology ، Facies ، Sedimentary environment