Calcareous nannofossils from the Gurpi Formation (Lower Santonian-Maastrichtian), faulted Zagros range,western Shiraz,Iran |
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Authors: | F Hadavi S Senemari |
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Institution: | 1.Department of Geology, Faculty of Science,Ferdowsi University,Mashhad,Iran;2.Department of Mining, Faculty of Engineering,Imam Khomeini International University,Qazvin,Iran |
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Abstract: | The Gurpi section in western Shiraz, faulted Zagros range of southwestern Iran, contains one of the most complete Early Santonian
to Late Maastrichtian sequences. The lack of a good fundamental paleontological study is a strong motivation for investigating
calcareous nannofossils in southwestern Iran. The Gurpi Formation is mainly made up of grey shale. As a result of this study,
23 genera and 47 species of nannofossils have been identified for the first time. This confirms the existence of biozones
CC14–CC26, which suggests the age of Early Santonian to Late Maastrichtian. All Early Santonian to Late Maastrichtian calcareous
nannofossil biozones from CC14 (equivalent to the Micula decussate Zone) to CC26 (equivalent to the Nephrolithus frequens Zone) are discussed. Additionally, the zonal subdivision of this section based on calcareous nannofossils, is correlated
with planktonic foraminiferal zones (Dicarinella asymetrica Zone to Abathomphalus mayaroensis Zone). We can also learn about the predominant conditions of the studied sedimentary basin that was in fact a part of the
Neotethys basin with the existence of index species of calcareous nannofossils indicating a warm climate and high depths of
the basin in low latitudes. |
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