Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Biostratigraphy and litho stratigraphy of Late Cretaceous sequences in Maracan Section , North of Khoy, North west of Iran

Document Type : Original Research Paper

Authors
Mahin mohamadi 1
R. Shabanian 2
H. M. Alizadeh 3
1 Payame Noor University, Head office, Tehran, Iran
2 Assistant Professor, Department of Geology, Payam Noor University, Iran
3 M.Sc., Department of Geology, Payam Noor University, Iran
10.22071/gsj.2020.104131
Abstract
This research has aimed to study the biostrtigraphy and lithostratigraphy of late cretaceous deposits  in south of Maracan village , with 320 m thickness.This sequence overlaid the lower cretaceous deposits and have been covered  by Quaternary sedimentary and magmatic rocks. Based on field study and lithological diversity 8 lithic zone have been investigated.  102 samples have been picked up systematically from this sequence. This study lead to determining 41 species from 15 genera of planktonic foraminifera.The  systematic and classification of fauna are based on The (Postuma 1971) , (Caron1985) , (Loeblich and Tappan 1988) and (Permoli Silva And Verga 2004).  .Based on their range chart the bio zonation model for this deposit with 9 Bio Zones as bellow  have been suggested  and have compared with cretaceous global standard bio zones (Robazynsky and Caron 1985) and (Permoli Silva and Verga, 2004)
Dicarinella concavata  Interval  Zone (Robazynsky and Caron, 1995)
Dicarinella asymetrica Total  range  Zone(Robazynsky and Caron, 1995) 
Globotruncanita elevata IntervalrangeZone(Robazynsky and Caron, 1995)  
Globotruncana ventricosa IntervalZone  (Robazynsky and Caron, 1995)
Rodotruncana  calcarata Total  range  Zone(Robazynsky and Caron, 1995)  
Globotruncanella  havnensis  Partial Range Zone (Robaszynski  and Caron, 1985)
Globotruncana aegyptiaca Interval  Zone (Robazynsky and Caron, 1995)
Gansserina gansseri   Interval  Zone (Robazynsky and Caron, 1995)
Abathamphalus mayaroensis  Total  range  Zone(Robazynsky and Caron, 1995) 
The suggested age for th.is sequence based on planktonic foraminifera is upper coniantian to upper Maestrichtian  and belong to deep shelf area . Based on the morphology of planktonic foraminifera and their keei we suggest deep sea environment for these  deposits. 
Keywords
Biostratigraphy
Lithostratigraphy
Late Cretaceous
Maracan
Planktonic Foraminifera
Biozonation

Subjects

References
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Scientific Quarterly Journal of Geosciences
Volume 29, Issue 114 - Serial Number 114
Volume 29, Serial Number 114, Winter 2019
Autumn 2019
Pages 51-60