R Shabanian; N Farajnezhad
Abstract
Permian deposits crop out in the North East QarehZiaaeddin (Illanlu section) consisting Dorud, Ruteh, Nesen and Elli Bashi formation respectively. In this section, the Ruteh Formation composes about 751.3m of dark to grey, medium to massive limestone. The Nesen Formation contains approximately 627.3m ...
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Permian deposits crop out in the North East QarehZiaaeddin (Illanlu section) consisting Dorud, Ruteh, Nesen and Elli Bashi formation respectively. In this section, the Ruteh Formation composes about 751.3m of dark to grey, medium to massive limestone. The Nesen Formation contains approximately 627.3m of shaly limestone, shale and marl and finally the Elli Bashi formation contains about 22.7m grey thin nodular limestone, Red limestone and colored shale. The lower boundary of marine sequence is marked disconformably by Dorud Formation and upper boundary is conformable and continuous with Early and middle Elika Formation. On the basis of stratigraphical distribution of microfossils chiefly foraminifera five Assemblage biozoneswere distinguished includingTetrataxis-Globivalvulina-Nankinella Assemblage Biozone (Kubergandian), Langella-Geinitzina Assemblage Biozone (Early to Middle Murghabian), Paraglobivalvulina-Pachyphloia Assemblage Biozone (Late Murghabian to Midian), Codonofusiella-Palaeotextolaria Assemblage Biozone(Midian), Frondina-Hemigordius-Cribrogenerina Assemblage Biozone (Dzhulfian). The identified microfossils suggest Kubergandian to Dorashamian ages (Middle to Late Permian) for carbonate sequences of Permian at the study area. On the basis of lithological changes 15 lithozone were also recognized.With regards to lithological and paleontological characteristics and sequence thickness of marine sequence the Illanlu section is proposed as standard section for Middle and Late Permian stages.
M Sadeghi; K Rashidi; R Shabanian
Abstract
Succession of Permian system in Pir-Eshagh stratigraphic section has been mesured totally about 1400 m, which it's base consists mainly of Dorud formation with thickness of about 100 m which in turn has been overlain by Ruteh and Nesen formations with thickness of 1100 and 200 m respectively. Lower boundary ...
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Succession of Permian system in Pir-Eshagh stratigraphic section has been mesured totally about 1400 m, which it's base consists mainly of Dorud formation with thickness of about 100 m which in turn has been overlain by Ruteh and Nesen formations with thickness of 1100 and 200 m respectively. Lower boundary of this succession overlay unconformablyon the Devonian volcanic rocks and the upper parts continuously and concordantly is changed to yellow lamellar limestone, Elika formation that deposited in lower and middle Triassic. For identification of various calcareous genus and species of algae in these sediments,we systematically selected 220 thin sections from the lower bound up to the upper bound based on the lithological changes perpendicular to the strike of layers. In this study, we identified 7 genus and 9 types of dasycladaceae green algae Mizzia sp., Mizzia velebitana, Mizzia cornuta,Macroporella cf. nuda, Macroporella sp., Epimastopora sp., Epimastopora symetrica, Paraepimastopora longutuba, Epimastopora likana, Epimastoporella japonica, Tabasoporella tulipaformis, Gyroporella sp., Gyroporella nipponica, and 2 genus and 5 types of gymnocodiacea algae family Permocalculus sp., Permocalculus cf. dikenliderensis, Permocalculus fragilis, Permocalculus plumosus, Permocalculus tenellus, Gymnocodium sp., Gymnocodiumbellerophontis at Ruteh and Nesen formations. Also, Tabasoporella tulipaformis algae belonging to the dasycladaceae family which has been introduced from the Jamal formation, for the first time was identified and reported from the carbonated units in the northwest of Iran.
R Shabanian; N Ghanizadeh; M Mohammadi; N Roohi
Abstract
In this study, 60 samples have been studied from Carboniferous deposits of Khames stratigraphical section, 10 Km southeast of Khalkhal. The marine sequence of Khames stratigraphical section is about 163.5 m. thick and consists of gray to black Limestone and dolomitic limestone. The lower boundary of ...
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In this study, 60 samples have been studied from Carboniferous deposits of Khames stratigraphical section, 10 Km southeast of Khalkhal. The marine sequence of Khames stratigraphical section is about 163.5 m. thick and consists of gray to black Limestone and dolomitic limestone. The lower boundary of the under study section marked with yellowish limestones of Cretaceous and dark Sills with Faulted contact. The upper boundary of the Carboniferous strata is covered with Pliocene Polygenetic conglomerate disconformably. The Carboniferous unit studied here has not been named so far, so in this research, we have attempted to identify the stratigraphical position of the mentioned sequence. In this research 30 genera and 25 species of benthic foraminifera were identified similar to those reported from carboniferous strata of Qezelqaleh, Bagher Abad, Mobarak and Sardar formations suggesting a Late Visean to Early Bashkirian age for the Khames Carboniferous marine sequence.
