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Title: The sedimentology of the Upper Khami Group, Lower Cretaceous, in East Khuzestan Southwest Iran
Author: Sedaghat, Reza.
Awarding Body: University of London
Current Institution: University of London
Date of Award: 1983
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The Lower Cretaceous Upper Khami Group is a widespread stratigraphic unit in the Zagros Mountains of southwest Iran. It is represented by two facies, the depostion of which was influenced by a hinge line which trended northeast - southwest. Shallow marine carbonates developed on the platform to the east with a deeper water radiolarian facies to the west. On the platform the whole group comprises a megacyc10them which can be divided into two shallowing-up (regressive) cyclothems. The lower cyclothem is minor transgressive - major regressive, and is deve~oped throughout the region. It records a predominantly regressive sequence of carbonates which formed in response to rapid sedimentation rates in excess of subsidence. The minor transgressive phase which initiated the cycle is thought to have been due to local fluctuations of relative sea level. Shallow marine sub-tida1/inter-tida1 carbonate sediments together with more argillaceous deeper water carbonates form the bulk of this sequence. The upper. cyclothem is major transgressive - minor regressive, and can only be recognised as a cycle in the eastern part of the study area where the transgressive and regressive phases can be identified. The transgression, believed to have been caused by eustatic sea level rise, is suggested by the dominance of argillaceous units with only minor carbonates. All of these were deposited below wave base in environments of wide lateral extent which ranged from open marine to distal deeper marine. The regressive phase of shallow marine carbonate sedimentation terminates this upper cyclothem in the eastern part of the area. Twelve lithofacies were recognised in the course of field work and later petrographic studies. Features studied for environmental subdivision include: sedimentary structures and textures, composition, palaeoecology and early diagene~is, combined with a review of similar features in Quaternary and ancient carbonate sediments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available