Facies analysis and depositional environment of the upper jurassic naokelekan formation in two selected outcrop sections from Kurdistan Region, ne Iraq

Other Title(s)

التحليل السحني و البيئة الترسيبية لتكوين ناوكيليكان (الجوراسي الأعلى)‎ في مقطعين مختارين من إقليم كردستان، شمال شرقي العراق

Joint Authors

Abd Allah, Rzkir Abd al-Karim
MuhammadI, Muhammad Sadi Nur
al-Shahrazuri, Arkan O. H.

Source

Iraqi Bulletin of Geology and Mining

Issue

Vol. 16, Issue 1 (30 Jun. 2020), pp.1-14, 14 p.

Publisher

Ministry of Industry and Minerals Iraqi Geological Survey

Publication Date

2020-06-30

Country of Publication

Iraq

No. of Pages

14

Main Subjects

Earth Sciences, Water and Environment

Topics

Abstract EN

The Upper Jurassic Naokelekan Formation is mainly composed of organic calcareous shale with some limestone and dolomite.

According to the lithology of the formation in two selected sections, three units can be identified as follow, from bottom to top: a) soft, black, fissile, and highly bituminous, calcareous shale and thin-medium bedded, dark brown, bituminous limestone and dolomitic limestone, b) hard, fine-grained, highly mottled and stylolitic, fossiliferous, dark grey, medium-thick bedded limestone and dolomitic limestone, c) fissile, soft black, calcareous, medium-grained, fetid shale and dark grey, hard, dolomitic and argillaceous medium grained limestone.

The microfacies include Lime-Mudstone, Lime-Wackestone and Lime-Wackestone/ Packstone.

The Benthic (Miliolid) and pelagic (Globigerina) foraminifera, ammonites, ostracods, pelecypods, gastropods and calcispheres of various sizes are the most common skeletal grains, while peloids are the main non-skeletal grains.

Based on lithology and microfacies analysis, the formation was deposited in two different sedimentary environments including lagoon (subtidal) environment for the lower and upper units and shallow marine environment for the middle unit.

The upper contact with the Barsarin Formation and lower contact with the Sargelu Formation are gradational and conformable

American Psychological Association (APA)

al-Shahrazuri, Arkan O. H.& MuhammadI, Muhammad Sadi Nur& Abd Allah, Rzkir Abd al-Karim. 2020. Facies analysis and depositional environment of the upper jurassic naokelekan formation in two selected outcrop sections from Kurdistan Region, ne Iraq. Iraqi Bulletin of Geology and Mining،Vol. 16, no. 1, pp.1-14.
https://search.emarefa.net/detail/BIM-957602

Modern Language Association (MLA)

MuhammadI, Muhammad Sadi Nur…[et al.]. Facies analysis and depositional environment of the upper jurassic naokelekan formation in two selected outcrop sections from Kurdistan Region, ne Iraq. Iraqi Bulletin of Geology and Mining Vol. 16, no. 1 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-957602

American Medical Association (AMA)

al-Shahrazuri, Arkan O. H.& MuhammadI, Muhammad Sadi Nur& Abd Allah, Rzkir Abd al-Karim. Facies analysis and depositional environment of the upper jurassic naokelekan formation in two selected outcrop sections from Kurdistan Region, ne Iraq. Iraqi Bulletin of Geology and Mining. 2020. Vol. 16, no. 1, pp.1-14.
https://search.emarefa.net/detail/BIM-957602

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references : p. 13-14

Record ID

BIM-957602