Paleoenviroment of the Dalichai Formation in Darjazin section, North of Semnan based on palynomorphs and Microfacies

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Naderiyan Maryam; ZAREI ELAHE; Mohammad Khani Khadijeh

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Journal: GEOSCIENCES Year:2020 | Volume:30 | Issue:117 Page(s): 287-294

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Title

Paleoenviroment of the Dalichai Formation in Darjazin section, North of Semnan based on palynomorphs and Microfacies

Author(s)

Naderiyan Maryam | ZAREI ELAHE | Mohammad Khani Khadijeh | Issue Writer Certificate

Keywords

PaleoenviromentQ2

Dalichai FormationQ2

PalynomorphQ2

MicrofaciesQ2

Abstract

The Dalichai Formation in Darjazin section in NE Semnan with a thickness of 631 meters consisting of an alternation of bulish-gray was studied. This formation overlies the Shemshak formation disconformity with conglomerate bed and it has gradually been covered by the thick-beded limestones of the Lar formation. In order to study Paleoenviroment of the Dalichai Formation the authors examined many different factors including Microfacies and palynological data (abundance and diversity of Dinocyst, proximate to chorat Dinocyst, palynofacies analysis and "selective preservation of organic matter"). A high percentage of brown wood and sporomorphs and the dominance of cavate and proximate dinocysts such as Nannoceratopsis gracilis, and pareodinia ceratophora and fluorescent amorphous organic matter, as well as Miliolid benthic foraminifera are evidence of suboxic to anoxic condition, which favored accumulation and preservation of organic matter in open marine lagoon, in the lower part of Dalichai Formation. A decrease in the brown wood and abundance and species richness of marine Palynomorph (mainly chorate dinocysts) reflects more offshore settings in the upper part of Dalichai Formation. On the other hand, Appearance and increase of planktonic foraminifera and Radiolar and posidonia indicate development of strong marine transgression and deposition in an open marine environment.

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APA: Copy

Naderiyan, Maryam, ZAREI, ELAHE, & Mohammad Khani, Khadijeh. (2020). Paleoenviroment of the Dalichai Formation in Darjazin section, North of Semnan based on palynomorphs and Microfacies. GEOSCIENCES, 30(117 ), 287-294. SID. https://sid.ir/paper/385481/en

Vancouver: Copy

Naderiyan Maryam, ZAREI ELAHE, Mohammad Khani Khadijeh. Paleoenviroment of the Dalichai Formation in Darjazin section, North of Semnan based on palynomorphs and Microfacies. GEOSCIENCES[Internet]. 2020;30(117 ):287-294. Available from: https://sid.ir/paper/385481/en

IEEE: Copy

Maryam Naderiyan, ELAHE ZAREI, and Khadijeh Mohammad Khani, “Paleoenviroment of the Dalichai Formation in Darjazin section, North of Semnan based on palynomorphs and Microfacies,” GEOSCIENCES, vol. 30, no. 117 , pp. 287–294, 2020, [Online]. Available: https://sid.ir/paper/385481/en

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