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King Abdulaziz University (2012)

Geological and structural studies on Jabal Daf- Jabal Abu Bakr area, Wadi Fatima, Kingdom of Saudi Arabia

Alsubhi, Mohammed Barakatallah

Titre : Geological and structural studies on Jabal Daf- Jabal Abu Bakr area, Wadi Fatima, Kingdom of Saudi Arabia

Auteur : Alsubhi, Mohammed Barakatallah

Université de soutenance : King Abdulaziz University

Grade : Master 2012

Résumé
Fatima Formation is an important rock unit within the Arabian Shield of the kingdom of Saudi Arabia, laying at the western part of the shield and characterized by its extremely complicated structural framework. The complex history of deformation of Fatima Formation is still not studied in adequate detail so far. Important details concerning the sequence of deformation affecting Fatima Formation are not considered in previous publications and still need further studies. Such details are well represented in the area under consideration. The present study is focused on the detailed mapping and structural analysis of that formation. Detailed mapping is based on structural investigation, comprehensive field work and satellite image interpretation. Structural studies are done through standard methodology including detailed field work, data collection and geometrical analysis. Major thrust duplex and associated major folds constitute the main feature of the structural framework of Fatima Formation. A floor thrust of NNE-SSW average trend and ESE dip controls its contact against the Pre-Fatima granodiorite, and a roof thrust runs NNE-SSW and dip ESE mainly along the contact between the Middle and Upper Fatima Members. Thrusting has resulted in the development of the system of fifteen major folds of NNE to NNW plunges and westward vergence. Three phases of minor folds are progressively developed through a prolonged thrusting event. Major folding is coeval with the second folding phase which represents the climax of the thrusting event.

Présentation

Page publiée le 22 décembre 2014, mise à jour le 4 décembre 2017