Z Khosravi; S.M Hosseini-Nezhad
Abstract
The carbonate and terrigenous sedimentary sequence of the Padeha and Bahram formations (late Givetian- late Frasnian) with a total thickness of 126 m have a gradational and conformable contact at Baghin region of W Kerman in Central Iran. The terrigenous facies are mainly consisting of sandstone and ...
Read More
The carbonate and terrigenous sedimentary sequence of the Padeha and Bahram formations (late Givetian- late Frasnian) with a total thickness of 126 m have a gradational and conformable contact at Baghin region of W Kerman in Central Iran. The terrigenous facies are mainly consisting of sandstone and shale deposited in the beach environment. The carbonate rocks including dolomite and limestone have tidal flat, lagoon and barrier (shoal) facies. Based on the index conodonts and brachiopods the late Givetian- late Frasnian age is suggested for this studied section. The conclusions of petrographical studies indicated a shallow carbonate platform of ramp type for these sediments. The stratigraphical study of the Bahram formation at the studied area resulted in identifying 3 sedimentary sequences of the third order, which according to the microfacies and conodonts consist of the following items. The first sequence begins with transgression at the base of the Lower falsiovalis – Upper falsiovalis zone (TST), with continuation of transgression, it reaches the maximum flooding level (mfs) indicated by the coral bindstone facies in a shoal environment and then is followed by the relevant HST parasequences. The second sequence begins at transitans – punctata zone, and finally the TST parasequences with ooid grainstone in a shoal environment reaches the maximum flooding level (mfs) at the Lower rhenana zone and ceases, and then is followed by the HST parasequences. The third sedimentary sequence begins at the base of Upper rhenana-? linguiformis zone, its maximum flooding surface (mfs) is in the middle of the Upper rhenana -?linguiformis zone and is identified by the spiculate wackestone facies in an open sea environment, and it is followed by the HST parasequences. These sequences are limited by the sequential boundaries of SB1 and SB2 types.
H Gholamalian; S Ghoreishi Maremy; M Parvaneh Nezhad Shirazi
Abstract
The Bahram Formation equivalent sequence in the Gerik section (eastern Zarand) displays middle Frasnian to early Famennian age on the basis of conodont investigation. Twenty-eight species and subspecies were identified. Seven biozones were recognized on the basis of vertical distribution of these taxa ...
Read More
The Bahram Formation equivalent sequence in the Gerik section (eastern Zarand) displays middle Frasnian to early Famennian age on the basis of conodont investigation. Twenty-eight species and subspecies were identified. Seven biozones were recognized on the basis of vertical distribution of these taxa along the stratigraphic column; older than Upper hassi Zone, Upper hassi – jamieae zones, ?Lower rhenana Zone, Upper rhenana – linguiformis zones, Lower triangularis, Middle triangularis - Lower crepida zones, Middle – Upper crepida zones. Index conodont species those are recovered from the biostrome horizon in the lower part of section proved the middle Frasnian age (Upper hassi – jamieae zones). From view of conodont fauna, lithostatigraphy and age; the Gerik section is comparable with other successions of the Bahram Formation in Kerman, Tabas and Esfahan areas and shows a shallow sedimentary environment.
M.R Kebriaee- Zadeh
Abstract
Hojedk section is located 62 km north of Kerman. In this section Padeha Formation with Middle Devonian age overlies Bahram Formation conformably, and it is covered with Jamal Formation (Late Permian) with a disconformity boundary. The study of Bahram Formation brachiopoda resulting into 32 species and ...
Read More
Hojedk section is located 62 km north of Kerman. In this section Padeha Formation with Middle Devonian age overlies Bahram Formation conformably, and it is covered with Jamal Formation (Late Permian) with a disconformity boundary. The study of Bahram Formation brachiopoda resulting into 32 species and subspecies consists of: Schizophoria striatula, Schizophoria cf. iowaensis, Devonoproductus sp., Productella cf. subaculeata, Strophodonta sp., Cyphoterorhynchus koraghensis, Cyphoterorhynchus koraghensis interpositus, Ripidiorhynchus elburzensis, Ripidiorhynchus kermanensis, Ripidiorhynchus minutissimus, Paropamisrhynchus kotalensis, Lateralatirostrum esfehensis, Spinatrypina chitralensis, Spinatrypina bodini, Spinatrypina cf. robusta , Desquamatia (Desquamatia) sp., Desquamatia (Serateypa) sp., Athyris chitralensis, Athyris sp., Anathyris e. g. helmersenii, Gypidula sp., Cyrtospirifer verneuili echinosus, Cyrtospirifer kermanensis, Cyrtospirifer schelonicus, Cyrtospirifer sp., Uchtospirifer multiplicatus, Uchtospirifer multiplicatus minor, Tenticospirifer cyrtinaformi, Tenticospirifer cf. tenticulum, Indospirifer sp., Rigauxia hutkensis, Cranaena cf. rigauxi, Based on the biostratigraphical value of the recognized brachiopoda, the age of Bahram Formation in the Hojedk section is determined Early- Late Frasnian.
