Author/Authors :
Nafarieh، E نويسنده Faculty of Sciences, Department of Geology, University of Isfahan, Isfahan, Iran , , Vaziri-Moghaddam، H نويسنده Faculty of Sciences, Department of Geology, University of Isfahan, Isfahan, Iran , , Taheri، A نويسنده Faculty of Earth Sciences, Department of Geology, Shahrood University of Technology, Shahrood, Iran , , Ghabeishavi، A نويسنده Department of Geology, National Iranian South Oil Company, Ahvaz, Iran ,
Abstract :
Biofacies and palaeoecology of the limestone of the Jahrum Formation in the Lar area in the southwest of Iran
(Zagros Basin) is addressed in this paper. Our detailed analysis of biofacies and palaeoecology shows that the
Jahrum Formation in the studied area were deposited in a carbonate open shelf dominated by heterozoan and,
subordinately, photozoan skeletal assemblages. Based on analysis of larger benthic foraminiferal assemblages and
biofacies features, two major depositional environments are identified. These include inner shelf and middle shelf
environments. The inner shelf facies is characterized by wackestone-packstone, dominated by various taxa of
imperforate foraminifera. The middle shelf is represented by wackestone-packstone with a diverse assemblage of
larger foraminifera with perforate wall. The distribution of the larger benthic foraminifera indicates that shallow
marine carbonate sediments of the Jahrum Formation at the studied areas have been deposited in the photic zone
of tropical to subtropical oceans.
