Abstract
In this research, a review was done on Permo-Triassic deposits in Central Iran including Abadeh, Hambast, and Elika formations. Following an overview about the circumstances of Central Iran Basin during Permotriassic time interval, the respective formations are introduced, and then, history of paleontology studies on these deposits will be depicted. Through analysis and comparison of previous studies, the following ages were estimated for the aforementioned formations: Early Dzhulfian for Abadeh Formation, Late Dzhulfian-Dorashamian for Hambast Formation, and Early Triassic (Scythian) for Elika Formation. Also, Permotriassic boundary in Central Iran is continuous, bearing the proposed sedimentation and fossil content. It is noteworthy that due to volcanic events at the boundary of these deposits in Central Iran, one might infer that occurrence of the aforementioned activities has been among the major causes of the respective extinction.
Highlights
It is highly significant to study deposits of Permo-Triassic boundary because this boundary indicates many events in the geological history and transition from Paleozoic into Mesozoic
In Iran Permo-Triassic deposits are observed continuously and together with sedimentation within a geosyncline during Late Permian resulting from gradual closure of Paleo-Tethys [3]. This geosyncline has a northwestern-south-eastern trend and is parallel with the main Zagros Fault, extending from Dzhulfa Region in northwestern area of Iran up to Hambast Mountain Range in Central Iran Late Permian deposits in Iran which are recognized as Abadeh and Hambast Formations [4] and Early Triassic deposits are equivalent to Elika Formation: - Abadeh Formation with the age of Early Dzhulfian and thickness of 334 meters comprises units 4 and 5 in
Permian deposits were assigned to Early Dzhulfian-Late Dorashamian based on stratigraphic distribution of conodonts, and, the initial Triassic sediments were attributed to Early Triassic (Scythian) due to presence of Claria. - Kouzer [12]-[14] studied taxonomy of Permo-Triassic conodonts of Shahreza and Abadeh (Central Iran). - Through studying conodonts and macrofossils of Permo-Triassic deposits in northeast of Abadeh, Ghaedi [15] proposed that the extinction phenomenon has occurred at the beginning of Triassic and not the end of Permian at least in this region that is aproximately similar to the age of extinction, recognized in the regions of interest
Summary
In Iran Permo-Triassic deposits are observed continuously and together with sedimentation within a geosyncline during Late Permian resulting from gradual closure of Paleo-Tethys [3] This geosyncline has a northwestern-south-eastern trend and is parallel with the main Zagros Fault, extending from Dzhulfa Region in northwestern area of Iran up to Hambast Mountain Range in Central Iran Late Permian deposits in Iran which are recognized as Abadeh and Hambast Formations [4] and Early Triassic deposits are equivalent to Elika Formation: - Abadeh Formation with the age of Early Dzhulfian and thickness of 334 meters comprises units 4 and 5 in. - Hambast Formation with Early Dzhulfian-Dorashamian age and thickness of 36.5 meters in the type section is representative of carbonate deposits with terrigenous interbeds Deposits of this formation that incorporate units 6 and 7 of the study are conducted by Taraz [4]. The previous paleontological studies must be reviewed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
