Early Jurassic–Early Cretaceous Calcareous Nannofossil Biostratigraphy and Geochemistry, Northeastern Iraqi Kurdistan: Implications for Paleoclimate and Paleoecological Conditions

Early Jurassic- to Early Cretaceous-age calcareous nannofossils from the Sarki, Sehkanyian, Sargelu, Naokelekan, Barsarin and Chia Gara formations are investigated for the first time from the Warte area, northeastern Iraqi Kurdistan. A range of isotopic and inorganic geochemical analyses are carried...

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Bibliographic Details
Published in:Geosciences (Basel) 2022-02, Vol.12 (2), p.94
Main Authors: Omar, Nagham, McCann, Tom, Al-Juboury, Ali I., Ustinova, Maria A., Sharezwri, Arkan O.
Format: Article
Language:English
Subjects:
Age
Aluminum
Aridity
Biostratigraphy
calcareous nannofossils
Climatic conditions
Copper
Cretaceous
Earth science
Geochemistry
Iraq
Isotopes
Jurassic
Oxygen
Oxygen isotopes
Paleoclimate
Paleoclimatology
Paleoecology
stable isotopes
Stratigraphy
Strontium
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Summary:Early Jurassic- to Early Cretaceous-age calcareous nannofossils from the Sarki, Sehkanyian, Sargelu, Naokelekan, Barsarin and Chia Gara formations are investigated for the first time from the Warte area, northeastern Iraqi Kurdistan. A range of isotopic and inorganic geochemical analyses are carried out in order to reconstruct the paleoecological and paleoclimatic conditions during which the Sarki, Sehkanyian, Sargelu, Naokelekan, Barsarin and Chia Gara formations were deposited. The age of the Sargelu Formation was determined as Bajocian–Callovian based on the first occurrence of Cyclagelosphaera margerelii, Watznaueria britannica, W. fossacincta, W. manivitiae, Watznaueria barnesiae and Watznaueria ovata. Geochemical proxies (Sr, Ca, Al, Rb/Sr, Sr/Cu and Sr/Ba) for paleoclimate and paleoecological conditions, along with oxygen isotopes (δ18O) data, suggest that warm and arid climatic conditions were predominant during the Early Jurassic–Early Cretaceous period.
ISSN:2076-3263
2076-3263
DOI:10.3390/geosciences12020094