Facies analysis, sedimentary environments and sequence stratigraphy of Sachun formation in Zarghan section (folded Zagros zone)
Subject Areas :Soolmaz Arzaghi 1 , Khosro Khosro tehrani 2 , Massih Afghah 3
1 - دانشجوی کارشناسی ارشد، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران
2 - استاد گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران
3 - استادیار گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد شیراز
Keywords: Sachun Formation, Zagros, Carbonate facies, Evaporite Facies, Ramp Platform, Sequence, Stratigraphy,
Abstract :
The Sachun Formation is one of the lithostratigraphy units in south-west of Iran. This Formation inZarqan section with thickness of 259.6 meters consists of various layers of colored shale/ marl, evaporateand carbonate sediments. It sandewiched between Tarbur and Jahrom Formations. Its lower contact withthe underlying Tarbur Formation is unconformable, but its upper contact with overlying JahromFormation is conformable.Recognized facies of this formation sediments in Zarqan Section ( foldedZagros zone) comprise carbonate, evaporate and terigenou which divided in two facies belt of tidal flatand lagoon. Totally 11 facies and sub-facies have been recognized; 5 tidal falt, 4 lagoon and 2 terrigenousfacies. Abundance of shallow facies against lack of deep facies indicates that the Sachun Formation havedeposited in a ramp platform. Due to Sequence stratigraphy study of this formation in Zarqan section, onesedimentary sequence has been determined with a type one sequence boundry in its lower contact withTarbur Formation.
