Evaluation of Late Campanian‒Early Maastrichtian surface water nutrients of the Gurpi Formation, Gurpi anticline: evidence from calcareous nannofossils

Mahanipour, A; Najafpour, A; Dastanpour, M

doi:10.22071/gsj.2017.44069

Evaluation of Late Campanian‒Early Maastrichtian surface water nutrients of the Gurpi Formation, Gurpi anticline: evidence from calcareous nannofossils

Document Type : Original Research Paper

Authors

A Mahanipour ¹

A Najafpour ²

M Dastanpour ³

¹ Assistant Professor, Department of geology, Faculty of science, Shahid Bahonar University of Kerman, Kerman, Iran

² M.Sc., Department of geology, Faculty of science, Shahid Bahonar University of Kerman, Kerman, Iran

³ Professor, Department of geology, Faculty of science, Shahid Bahonar University of Kerman, Kerman, Iran

10.22071/gsj.2017.44069

Abstract

Calcareous nannofossils have been investigated at the lower part of the Gurpi Formation at the southwest of Gurpi anticline. According to the index calcareous nannofossils CC22/UC15e^TP to CC24/UC18 bio-zones have been identified and the age of Late Campanian ‒ Early Maastrichtian is considered for the studied interval. Statistical analysis of the assemblages indicate the presence of high and low nutrient taxa. The relative abundance of oligotrophic taxa (Watznaueria barnesae, Watznaueria fossacincta, Prediscosphaera spp., Eiffellithus spp., Lithraphidites carniolensis, Staurolithites spp., Micula staurophora, Cribrosphaerella ehrenbergii) is higher than eutrophic forms (Biscutum constans, Discorhabdus ignotus, Placozygus spiralis, Reinhardtites spp., Zeugrhabdotus spp., Tranolithus orionatus), and an increasing trend in the relative abundance of oligotrophic taxa along with a decreasing trend in the relative abundance of eutrophic forms can be observed towards the upper parts of the section (Campanian-Maastrichtian boundary and Early Maastrichtian).

Keywords

Paleoecology

Gurpi Formation

Biostratigraphy

Campanian

Maastrichtian

Calcareous Nannofossils