Microfacies and sedimentary environment of carbonate member of Qaleh Dokhtar formation at Kuh-e-Birg section (south of Sarayan, southern Khorasan)
Subject Areas :
Ayesheh
Salmani
1
(دانش آموخته رشته زمین شناسی،دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران)
Gholamreza
mirab-Shabestari
2
(استادیار دانشگاه بیرجند)
Mohammad-Hosein
Adabi
3
(استاد دانشگاه شهید بهشتی)
S-Ali
Aghanabati
4
(استادیار دانشگاه آزاد اسلامی واحد تهران شمال)
Keywords: microfacies, Qaleh Dokhtar Formation, Kuh-e-Birg, East of Iran, Carbonate Platform,
Abstract :
The purpose of this research is identification of various microfacies and determination of sedimentaryenvironment of carbonate part of Qaleh Dokhtar Formation (Middle to Upper Jurassic) based on the fieldobservations and laboratory studies. The studied area is located at the Birg Mountain, south of Saryan city,Southern Khorasan province.The thickness of the studied sequence is 188m which mostly consists of spong spicule-bearing bioclasticwackestone, intraclastic/oolitic wackestone, peloidal packstone, intraclastic packstone, intraclastic/bioclasticwackestone and algal wackestone. According to the petrographic studies, skeletal fragments of Ghaleh DokhtarFormation consist shell fragment, brachiopod, spong spicule, .algae, corals, and foraminifera and also peloids,intraclasts and oncoids as non skeletal particles. Totally, seven microfacies belts were recognized which could bereferred to open marine, barrier and lagoon belts of a rimmed-shelf carbonate platform.
