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Geology of Ore Deposits

, Volume 58, Issue 6, pp 499–515 | Cite as

Application of kinematic vorticity and gold mineralization for the wall rock alterations of shear zone at Dungash gold mining, Central Eastern Desert, Egypt

  • Osama M. K. Kassem
  • Said H. Abd El Rahim
  • EL Said R. El Nashar
  • Kaled M. AL Kahtany
Article
  • 71 Downloads

Abstract

The use of porphyroclasts rotating in a flowing matrix to estimate mean kinematic vorticity number (Wm) is important for quantifying the relative contributions of pure and simple shear in wall rocks alterations of shear zone at Dungash gold mine. Furthermore, it shows the relationship between the gold mineralization and deformation and also detects the orientation of rigid objects during progressive deformation. The Dungash gold mine area is situated in an EW-trending quartz vein along a shear zone in metavolcanic and metasedimentary host rocks in the Eastern Desert of Egypt. These rocks are associated with the major geologic structures which are attributed to various deformational stages of the Neoproterozoic basement rocks. We conclude that finite strain in the deformed rocks is of the same order of magnitude for all units of metavolcano-sedimentary rocks. The kinematic vorticity number for the metavolcanic and metasedimentary samples in the Dungash area range from 0.80 to 0.92, and together with the strain data suggest deviations from simple shear. It is concluded that nappe stacking occurred early during the underthrusting event probably by brittle imbrication and that ductile strain was superimposed on the nappe structure during thrusting. Furthermore, we conclude that disseminated mineralization, chloritization, carbonatization and silicification of the wall rocks are associated with fluids migrating along shearing, fracturing and foliation of the metamorphosed wall rocks.

Keywords

kinematic vorticity microstructural gold mineralization dungash area Egypt 

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© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • Osama M. K. Kassem
    • 1
    • 2
  • Said H. Abd El Rahim
    • 2
  • EL Said R. El Nashar
    • 2
  • Kaled M. AL Kahtany
    • 1
  1. 1.SGSRC, Department of Geology, Faculty of ScienceKing Saud UniversityRiyadhKingdom of Saudi Arabia
  2. 2.Department of GeologyNational Research CenterDokki, CairoEgypt

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