EGU21-5091, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-5091
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Remote sensing characterization of transitional to alkaline igneous rocks and their potential mineralizations using ASTER data: the Moroccan Central High Atlas case study

Youssef Ahechach1,2, Muhammad Ouabid1, Otmane Raji1, Jean-Louis Bodinier1,3, Khalid Amrouch4, Houssa Ouali2, and Abderrahmane Soulaimani5
Youssef Ahechach et al.
  • 1Geology & Sustainable Mining, Mohammed VI Polytechnic University, Morocco
  • 2Geoscience: Géodynamique et Géoressources, Faculty of Sciences, Moulay Ismail University, Meknès, Morocco
  • 3Géosciences Montpellier, Montpellier University & CNRS, Montpellier, France
  • 4Australian School of Petroleum and Energy Resources, The University of Adelaide, Adelaide, South Australia 5005, Australia
  • 5Dynamique de la Lithosphère et Genèse des Ressources Minérales et Energétiques, Cadi Ayyad university, B.P. 2390, Marrakech, Morocco

Alkaline complexes are an important target for geological exploration, with both scientific and economic interests. They are host to different types of mineral deposits, such as Rare Earths, igneous phosphates, -and K-rich minerals and rocks. In Morocco, the Central High-Atlas (CHA) hosts several transitional to alkaline complexes ranging from Upper Jurassic to Eocene and showing almost all the differentiation terms of transitional to alkaline suites. These alkaline complexes are however poorly explored and their potential in terms of mineral resources is still elusive.

The aim of this research is to use Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) to discriminate different transitional to alkaline rock lithologies and their associated mineralizations. For that purpose, series of band ratios proven to be sensitive to the silica, mafic, felsic and carbonate contents of transitional to alkaline rocks were applied. Our results show that the major Upper Jurassic magmatic intrusions of Moroccan CHA, such as Anemzi, Inouzane, Tassent, and Tasraft, hold distinct igneous facies, mainly composed of Mafic to felsic rocks. Field and petrographic observations have confirmed the ASTER results and highlighted that these rocks are formed of gabbro to syenite. The later are associated with significant feldspar concentrations, but also host apatite, garnet, and magnetite vein-type ores. Thereafter, field- and petrographic-based data were used as training data to perform a supervised classification allowing to refine the geological mapping of the studied alkaline intrusions.

How to cite: Ahechach, Y., Ouabid, M., Raji, O., Bodinier, J.-L., Amrouch, K., Ouali, H., and Soulaimani, A.: Remote sensing characterization of transitional to alkaline igneous rocks and their potential mineralizations using ASTER data: the Moroccan Central High Atlas case study, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5091, https://doi.org/10.5194/egusphere-egu21-5091, 2021.

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