Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Biostratigraphic study of calcareous nannoplanktons of Khangiran Formation, east of Chehel Kaman, Koppeh Dagh area

Document Type : Original Research Paper

Authors
Fatemeh Hadavi
Saeideh Senemari
Department of Geology, Faculty of Science, Ferdowsi University, Mashhad, Iran
Abstract
The studied area is located west of Sarakhs, about 25 km. from Shurlogh village, Koppeh Dagh Mountains, north-east Iran. The formation under consideration is called Khangiran Formation and is composed of marl, limy-shale and sandy-limestone.
Due to insufficient laminations and particular lithology, samplings were rendered with much difficulty. However, the main purpose of this research was to establish biostratigraphic zonations and correlations with other universally accepted standard biozones. This is the first attempt that the named area was investigated systematically for calcareous nannofossils.
Twenty-nine samples were collected from Khangiran Formation. Calcareous nannofossils were studied with light and electronic microscopes, after particular processes had been carried out.
Eleven families, twenty-one genera and fifty-one species of calcareous nannofossils were investigated.
Nine biozones were determined based on the first occurrence and fossil assemblage in Khangiran Formation. These assemblages from base to top are NP13, and up to NP24(Martini, 1971).
The age of late early Eocene to late Oligocene is suggested for Khangiran Formation.
Keywords
Nanoplanktons
Khangiran Formation
Chehel Kaman
Koppeh Dagh
Iran

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 9, 33-34
Autumn & Winter 2000, vol. 9, No. 33-34
Autumn 2000
Pages 78-97