PALE OENVIRONMENTAL RECONSTRUCTION OF THE ABDERAZ FORMATION IN SANGANEH SECTION BASED ON PALYNOLOGICAL (DINOFLAGELLATE CYSTS) AND OSTRACODS EVIDENCES

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YOUSEFI MOGHADAM F.; ALLAMEH M.; HOSSEININEZHAD S.M.; BAKHSHANDEH L.

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Journal: GEOSCIENCES Year:2016 | Volume:25 | Issue:98 Page(s): 117-126

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Title

PALE OENVIRONMENTAL RECONSTRUCTION OF THE ABDERAZ FORMATION IN SANGANEH SECTION BASED ON PALYNOLOGICAL (DINOFLAGELLATE CYSTS) AND OSTRACODS EVIDENCES

Author(s)

YOUSEFI MOGHADAM F. | ALLAMEH M. | HOSSEININEZHAD S.M. | BAKHSHANDEH L. | Issue Writer Certificate

Keywords

PALE OENVIRONMENTQ2

PALYNOLOGICAL EVIDENCEQ2

OSTRACODAQ1

DINOFLAGELLATEQ2

AB-DERAZ FORMATIONQ2

Abstract

Abderaz Formation is one of the Lithostratigraphic units of upper Cretaceous whose age is determined as Turonian-Santonian in Kopet-Dagh sedimentary basin of northeast Iran. Its major lithology in Sanganeh section contains Marl, Marly limestone, and gray shales and light green shale along with three bands of chalky limestones. This formation thickness in Sanganeh section is measured 530 meter out of which 41 samples were systematically taken. In order to interpret the PALE OENVIRONMENT and sequence stratigraphy, this formation in Sanganeh section was analyzed using palynological facies and conformity of Ostracods and DINOFLAGELLATEs. Having examined the frequency ratio (abundance) of two groups of OSTRACODA (Platycopids to Podocopids), it was observed that the most abundant oceanic dissolved oxygen is seen in marly layers near calcareous band of chalky limestones and the least abundant is seen in layers far from those bands. In addition, based on the abundance of genera such as Paracypris, Brachycthere, and Bairdia mostly seen near calcareous band of chalky limestones and OSTRACODA with ornamented carapce and thicker layers such as Veenia, Pterygocythereis seen in marly layers near chalky limestones, it can be stated that it is shallower near calcareous band of chalky limestones and moving toward marly and shale layers it becomes deeper. Analyzing 82 Palynological slides resulted in identification of three Palynofacies of V, IV, II, in this formation. The results obtained from statistical studies of palynological factors including AOM to Marine palynomorph ratio, abundance of foraminifera test lining, and Peridinioid/Gonyaulacoid ratio for determining the amount of oxygen in the environment indicate that often there were low levels of oxygen in this formation however, there were times when oxic condition was dominant. Also in order to discuss relative sea level changes by Palynological facies, two factors were used; first one being dinocysts of specific inner neritic to outer neritic ratio and chorate/ proximate, proximochorate and cavate cysts (C/PPC) ratio.The results gained from studies on OSTRACODA confirm the results obtained from palynological studies and show that the Abderaz Formation is deposited in an open marine from Inner neritic to outer neritic in a disoxic to suboxic environment.

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APA: Copy

YOUSEFI MOGHADAM, F., ALLAMEH, M., HOSSEININEZHAD, S.M., & BAKHSHANDEH, L.. (2016). PALE OENVIRONMENTAL RECONSTRUCTION OF THE ABDERAZ FORMATION IN SANGANEH SECTION BASED ON PALYNOLOGICAL (DINOFLAGELLATE CYSTS) AND OSTRACODS EVIDENCES. GEOSCIENCES, 25(98), 117-126. SID. https://sid.ir/paper/32254/en

Vancouver: Copy

YOUSEFI MOGHADAM F., ALLAMEH M., HOSSEININEZHAD S.M., BAKHSHANDEH L.. PALE OENVIRONMENTAL RECONSTRUCTION OF THE ABDERAZ FORMATION IN SANGANEH SECTION BASED ON PALYNOLOGICAL (DINOFLAGELLATE CYSTS) AND OSTRACODS EVIDENCES. GEOSCIENCES[Internet]. 2016;25(98):117-126. Available from: https://sid.ir/paper/32254/en

IEEE: Copy

F. YOUSEFI MOGHADAM, M. ALLAMEH, S.M. HOSSEININEZHAD, and L. BAKHSHANDEH, “PALE OENVIRONMENTAL RECONSTRUCTION OF THE ABDERAZ FORMATION IN SANGANEH SECTION BASED ON PALYNOLOGICAL (DINOFLAGELLATE CYSTS) AND OSTRACODS EVIDENCES,” GEOSCIENCES, vol. 25, no. 98, pp. 117–126, 2016, [Online]. Available: https://sid.ir/paper/32254/en

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