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Donnish Journal of Geology and Mining Research

March 2015 Vol. 1(1), pp. 001-026

Copyright © 2015 Donnish Journals




Original Research Paper


Microfacies Analysis and Depositional Environment of the Sargelu Formation (Middle Jurassic) from Kurdistan Region, Northern Iraq


Rzger A. Abdula, Sardar M. Balaky, Mohammad Sadi Nourmohamadi and Muhamad Piroui

Department of Petroleum Geosciences, Soran University, Soran, Kurdistan Region, Iraq

Corresponding Author E-mail: rzger.abdula@soran.edu.iq

Accepted 11th March, 2015.



Abstract


The depositional sedimentary environment and petrology of the Sargelu Formation (of Late Toarcian–Late Bathonian age) is presented based on hand specimen descriptions, petrographic thin sections, and scanning electron microscope (SEM). This study examined certain outcrops from various areas in Iraqi Kurdistan in order to build on the earlier work and add new explanations. The formation is mainly composed of limestone with shale. The limestone is medium to thick bedded, calcareous or marly and bituminous with interbeds of dolomitic limestone and chert appears on the upper part of the formation. Three main microfacies types have been recognized within Sargelu Formation. They are lime mudstone, wackestone, and packstone. The occurrence and distribution of microfacies indicate that the position in overall is marine basin represent deeper ramp. On the basis of these three microfacies and a lithofacies, the Sargelu Formation is interpreted to represent deposition on the ramp. The organic-rich sediments of Sargelu Formation indicate an euxinic (anoxic) depositional environment.

Keywords: Carbonate, Jurassic, Microfacies, Posidonia, Ramp, Sargelu, Kurdistan.

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Cite This Article:

Rzger A. Abdula, Sardar M. Balaky, Mohammad Sadi Nourmohamadi and Muhamad Piroui. Microfacies Analysis and Depositional Environment of the Sargelu Formation (Middle Jurassic) from Kurdistan Region, Northern Iraq. Donnish Journal of Geology and Mining Research 1(1) 2015 pp. 001-026.


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