Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Lithostratigraphy and petrology studies of Shurijeh Formation in Cheshmeh Gilass area, northwestern Mashhad

Document Type : Original Research Paper

Authors
Department of Geology, Faculty of Science, University of Ferdowsi, Mashhad, Iran
Abstract
The Kopet-Dagh Basin is located in the north and northeast of Iran. From Jurassic through Miocene, the sedimentation went on relatively uninterruptedly in this basin. The area of study is located in the Cheshmeh Gilass Mountains which is situated about 50 km. northwest of Mashhad. The purpose of this study is to identify different lithofacies, as well as, ultimately to interpret the depositional history of the Shurijeh Formation in this area.
The Shurijeh Formation (Neocomian; Kalantari, 1969), is about 490 meters thick in this area, and conformably overlies the Mozduran Formation (Upper Jurassic) and also conformably underlies the Tirgan Formation (Aptian). This interval is mainly composed of red bed siliciclastic sediments and mostly fine to medium-grained rocks (shales and sandstones), that have been deposited in fluvial environments. Carbonates (micritic limestone and dolomite) and evaporate (gypsum) lithofacies of this formation indicates that, they were deposited in a closed basin (probably lake) under arid to semi-arid climatic conditions.
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Volume 8, 29-30
Autumn & Winter 1999, vol. 8, No. 29-30
Winter 1999
Pages 86-103