An investigation was made on the facies and sedimentary environment of upper cretaceous rocks at North West of Gorgan region. This study has also covered carving lime sediments mainly being micritic and sparits with fossil or bioclast markings, such as: Echinoderm, Alga, Lamelibransch, Brachiopodo, Berizoa. Field and microscopic studies led to recognition and separation of 10 carbonate and carving facies as follow: Group of open marine facies that include: Bioclastic Mudstone, Bioclastic Wackstone, Bioclastic Packstone. Group of barrier facies that include: Bioclastic Grainstone, Grainstone Packstone. Group of lagoon facies that include: Bioclastic Packstone, Peloid Wackstone. Group of continental facies that include: Litharenite, Sub-litharenite, Gerywacki. By interpretation and analysis of these microfacies and their related environment we shall be able to recognize the old geographical or palaeobiogeographic condition in this region which has proven to have been a ramp type carbonate platform with a nearly uniform slope or homodinal ramp.
کلید واژگان :Facies , Sedimentology , Lithology , Sedimentary Environment. , Gorgan
ارزش ریالی : 300000 ریال
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