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Geology of Ore Deposits

, Volume 55, Issue 6, pp 482–493 | Cite as

Structural analysis for metavolcanics and their metapyroclastics at gold deposit of the Mahd Ad Dahab area, Arabian Shield, Saudi Arabia

  • Osama M. K. Kassem
  • Abdel Aziz M. Al Bassam
  • Faisal K. Zaidi
Article
  • 143 Downloads

Abstract

The present study focuses on the gold mining in Mahd Ad Dahab region of Saudi Arabia. The study aims to assess the spatial relationship between tectonic contacts in Mahd Ad Dahab area and to provide a meaningful hypothesis relating gold metallogeny to the evolution of the Arabian Shield. Distribution and localization of gold occurrences in the study area was envisaged based on the different styles of microstructures and the major deformation phases affecting the area. The detailed petrographical and mineralogical investigations indicate that the metavolcanic rocks at the Mahd Ad Dahab gold mine area can be classified into metabasalt, metaandesite, and the felsic varieties (metadacite, metarhyodacite and metarhyolite) associating their metapyroclastics (conglomerate and tuffs). Furthermore, quartz forms allotriomorphic crystals which exhibit wavy extinction, deformational lamina and foliation due to subsequent deformations. Furthermore, we conclude that finite strain in the deformed rocks is of the same order of magnitude for all units of metavolcano-sedimentary rocks. Furthermore, contacts formed during intrusion of plutons with some faults in the Mahd Ad Dahab area under brittle to semi-ductile deformation conditions. In this case, finite strain accumulated during superimposed deformation on the already assembled nappe structure. It indicates that the contacts formed during the accumulation of finite strain.

Keywords

Gold Deposit Quartz Vein Finite Strain Eastern Desert Metavolcanic Rock 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • Osama M. K. Kassem
    • 1
    • 2
  • Abdel Aziz M. Al Bassam
    • 1
  • Faisal K. Zaidi
    • 1
  1. 1.SGSRC, Department of Geology, Science facultyKing Saud UniversityRiyadhKingdom of Saudi Arabia
  2. 2.Department of GeologyNational Research CenterDokki, CairoEgypt

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