Keywords : Khurmala

Diagenesis of Khurmala Formation in Dokan Area, North Eastern Iraq

Safwan F. Al-Lihaibi

Iraqi National Journal of Earth Sciences, 2012, Volume 12, Issue 3, Pages 17-34

Diagenesis were studied within Khurmala limestone Formation at Dokan area, Northeastern Iraq. The study recognized many diagenetic processes
affected limestone within a successive sequence including micrite envelope, dolomitization, dissolution, neomorphism, cementation, mechanical and chemical compaction. The study determined four diagenetic zones. They are marine zone (micrite envelope), mixing zone (dolomitization), meteoric pheratic zone (dissolution, neomorphism, cementation) and burial zone (mechanical and chemical compaction). According to the history of diagenesis and their sequence, the study revealed that periodical fluctuation in sea level has influenced on diagenetic processes and their paragenetic sequence.

Facies Analysis and Depositional Environment of Khurmala Formation in Bekhair Anticline –Dohuk Area, North Iraq

Nabil Y. Al-Banna Majid M. Al-Mutwali Jamal S. Al-Ghrear

Iraqi National Journal of Earth Sciences, 2006, Volume 6, Issue 2, Pages 13-22

The studied surface section of Khurmala Formation which lies in the northeast of Dohuk city north Iraq consists of mixed carbonate and clastic sediments, package about 60 meter thick of Early Eocene age. The carbonate sediment is comprising four microfacies association allocated to shoal bank (Kh2), lagoon (Kh1), intertidal (Kh1, Kh3), and supratidal (Kh4), while the clastic sediment included two lithofacies affiliated to estuaries depositional environment. A depositional model of the Khurmala Formation was proposed.
Diagenetic processes of dissolution and dolomitization are recognized in microfacies (Kh3).