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Numerical heat and fluid flow modeling of the Hercynian Draa Sfar polymetallic (Zn–Pb–Cu) massive sulfide deposit, Central Jbilets, Morocco

  • Laila Salama
  • El Mostafa Mouguina
  • Essaid El Bachari
  • Larbi Rddad
  • Mohamed Outhounjite
  • Mohamed Essaoudi
  • Lhou Maacha
  • Mohamed Zouhair
Original Paper
  • 34 Downloads

Abstract

Draa Sfar is a polymetallic (Zn–Pb–Cu) volcanogenic massive sulfide deposit with an actual resource of 13 Mt at 4.0% Zn and 1.3% Pb. It is part of the central Jbilets area known for its several Cu–Zn ore deposits. The ore is hosted in the upper Visean-Namurien sedimentary formation. Owing to the complexity of the geology of the ore deposits, numerical simulation approach was attempted to shed light into the temperature distribution, the circulation of the hydrothermal fluid and the genesis of massive sulfide ore bodies by evaluating the permeability, porosity, and thermal conductivity. On the basis of this simulation approach, the ore is predicted to be deposited at a temperature ranging between 230 and 290 °C. This temperature range is dependent on the pre-existing temperature of the discharge area where a metal-rich fluid precipitated the ore. The duration of the Draa Sfar ore body formation is predicted to be 15, 000 to 50, 000 years. Based on geological studies of Draa Sfar deposit together with the aforementioned results of the simulation approach, an ore genetic model for the massive sulfide ore bodies is proposed. In this model, the supply of ore-forming fluids is ensured by the combination of seawater and magmatic waters. Magma that generated rhyodacite dome acted as the heat source that remobilized the circulation of these ore-bearing fluids. The NW-SE trending faults acted as potential pathways for both the downward and upward migration of the ore-forming fluids. Due to their high permeability, the ignimbritic facies, host rocks of Draa Sfar ore bodies, have favored the circulation of the fluids. The mixing between the ore-forming fluids of magmatic origin and the descending seawaters and/or in situ pore waters led to the formation the ore bodies in 35,000 years. The position and size of the ore body, determined by the simulation approach, is consistent with the actual field geological data.

Keywords

Draa Sfar 3D modeling Numerical simulation Heat Fluid 

Notes

Acknowledgments

This contribution reports part of a PhD project of L. Salama at Cadi Ayyad University (FSSM Marrakech) sponsored by CMG-MANAGEM. The company Managem, responsible for the Draa Sfar mining operations, provided mine access, samples, and geological data; this support is gratefully acknowledged. The authors are grateful to Dr. Ozlem Yagbasan and Dr. Domenico Doronzo for their comments and suggestions that improve the quality of this paper.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.Service Geology, Mining Company of GuemassaMorocco Managem GroupCasablancaMorocco
  2. 2.Laboratory Dynamics of the Lithosphere and the Genesis of Mineral and Energy Resources (DLGR, URAC 43), Faculty of Sciences SemlaliaUniversity Cadi AyyadMarrakechMorocco
  3. 3.Laboratory of Information Systems Engineering (LISI), Faculty of Sciences SemlaliaUniversity Cadi AyyadMarrakechMorocco
  4. 4.Earth and Planetary Division, Department of Physical SciencesKingsborough Community College of the City University of New YorkBrooklyn, New YorkUSA

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