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International Journal of Earth Sciences

, Volume 108, Issue 4, pp 1233–1251 | Cite as

Emplacement levels and pre-existing structures control mechanisms and host rock interactions of three granitic plutons, western Arabian Shield

  • Abdelhamid El-FakharaniEmail author
  • A. M. A. Abd-Allah
  • El-Sawy K. El-Sawy
  • Zakaria Hamimi
  • Abdulrahman Shujoon
Original Paper
  • 122 Downloads

Abstract

Field relations, structural measurements, and microfabric analyses are used to explain the emplacement mechanisms of granitic plutons in the Asir terrane. These circular-to-elliptical granitic intrusions are prominent plutons scattered across the Arabian–Nubian Shield. Various structural and tectonic fabrics affecting three plutons in the western Arabian Shield encouraged studying the effect of pre-existing structures and emplacement levels on the emplacement mechanisms and related solid-state deformation. Two of these plutons, called Al Sayl and Um Ar Raka, are circular and enveloped by ductile or brittle solid-state deformation. Pre- and post-emplacement tectonic fabrics controlled the distribution and superposition of the solid-state deformation. Lateral expansion of magma during the emplacement of these plutons induced significant radial shortening that was associated with either high or low heat transfer into the host rocks and developed brittle or ductile solid-state deformation, respectively. Heat transfer was controlled by the emplacement level and magma pressure of each pluton. The third, oval-shaped Al Hawiyyah pluton was structurally controlled, where magma was emplaced first into twofold hinges on both sides of a thrust fault under low-to-intermediate differential stress. Syn-emplacement shortening was accommodated mainly by upward and lateral magma flows. Continuous magma flow caused uplift of the pluton and its surrounding host rocks and developed stretching structures in these rocks.

Keywords

Arabian shield Pluton emplacement Solid-state deformations Thermal transferring Structurally controlled intrusions 

Notes

Acknowledgements

This project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, under grant no. 33-145-33. The authors, therefore, acknowledge with thanks DSR for technical and financial support. Special thanks and appreciations are due to Kamal A. Ali for his critical and constructive review and English check of the manuscript.

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Copyright information

© Geologische Vereinigung e.V. (GV) 2019

Authors and Affiliations

  • Abdelhamid El-Fakharani
    • 1
    • 2
    Email author
  • A. M. A. Abd-Allah
    • 3
  • El-Sawy K. El-Sawy
    • 4
    • 5
  • Zakaria Hamimi
    • 6
  • Abdulrahman Shujoon
    • 1
  1. 1.Department of Structural Geology and Remote Sensing, Faculty of Earth SciencesKing Abdulaziz UniversityJeddahSaudi Arabia
  2. 2.Geology Department, Faculty of ScienceAswan UniversityAswânEgypt
  3. 3.Geology Department, Faculty of ScienceAin Shams UniversityCairoEgypt
  4. 4.Department of Technical Training, Faculty of Earth SciencesKing Abdulaziz UniversityJeddahSaudi Arabia
  5. 5.Geology Department, Faculty of ScienceAl-Azhar University (Assiut Branch)AsyûtEgypt
  6. 6.Geology Department, Faculty of ScienceBanha UniversityBanhaEgypt

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