Maleki Porazmiani, Saeed, Ghasemi-Nejad, Ebrahim, Farmani, Taghi. (1399). Palynology and sequence stratigraphy of the Albian-Cenomanian strata from the Koppeh-Dagh Basin, northeastern Iran. , 10(2), 351-365. doi: 10.22059/geope.2020.291183.648507
Saeed Maleki Porazmiani; Ebrahim Ghasemi-Nejad; Taghi Farmani. "Palynology and sequence stratigraphy of the Albian-Cenomanian strata from the Koppeh-Dagh Basin, northeastern Iran". , 10, 2, 1399, 351-365. doi: 10.22059/geope.2020.291183.648507
Maleki Porazmiani, Saeed, Ghasemi-Nejad, Ebrahim, Farmani, Taghi. (1399). 'Palynology and sequence stratigraphy of the Albian-Cenomanian strata from the Koppeh-Dagh Basin, northeastern Iran', , 10(2), pp. 351-365. doi: 10.22059/geope.2020.291183.648507
Maleki Porazmiani, Saeed, Ghasemi-Nejad, Ebrahim, Farmani, Taghi. Palynology and sequence stratigraphy of the Albian-Cenomanian strata from the Koppeh-Dagh Basin, northeastern Iran. , 1399; 10(2): 351-365. doi: 10.22059/geope.2020.291183.648507

Palynology and sequence stratigraphy of the Albian-Cenomanian strata from the Koppeh-Dagh Basin, northeastern Iran

Geopersia
مقاله 21، دوره 10، شماره 2 - شماره پیاپی 22287825، بهمن 2020، صفحه 351-365    اصل مقاله (2.87 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22059/geope.2020.291183.648507
نویسندگان
Saeed Maleki Porazmiani* 1؛ Ebrahim Ghasemi-Nejad2؛ Taghi Farmani2
1Department of Geology, College of Science, University of Tehran ,Thran ,Iran
2Department of Geology, College of Science, University of Tehran, Tehran,Iran
چکیده
The Albian-Cenomanian strata of the Koppeh-Dagh Basin were investigated for their marine palynomorphs and palynofacies contents and used for palaeoclimatic, palaeoenvironmental and sequence stratigraphical purposes. Various palynofacies criteria such as Palynological Marine Index (PMI), chorate/proximate, proximochorate and cavate ratio (C/PPC) and outer neritic/inner neritic index (ON/IN) were applied as alternative indicators to monitor the proximal-distal trends. Higher values of the former proxies versus low continental/marine ratio (CONT/MAR) were documented during periods of relative rise of sea-level. Increasing values of the marine palynological proxies such as the PMI, C/PPC and ON/IN were consistent with maximum flooding surfaces (MFS). A relatively diverse dinoflagellate cyst assemblage was reported at MFS, whereas, during the periods of relative sea-level fall, the dinocyst diversity decreased and coincided with those above-mentioned marine palynological ratios that reinforced terrestrial conditions. Palaeovegetation reconstruction showed the predominance of the pteridophyte spores. This palynoflora indicates a humid and warm climate during the Albian-Cenomanian time. Three deducted depositional sequences correspond with those suggested in previous studies based on surface and subsurface geological data. Sea-level changes correspond well with those reported from other parts of the Tethys.
کلیدواژه‌ها
palynology؛ Sequence stratigraphy؛ Albian-Cenomanian؛ Tethys؛ Koppeh-Dagh Basin
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