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Petrography and Geochemistry of the Farchana-Hadjerhadid Granitoids (Ouaddaï Massif, Eastern Chad)

Author

Listed:
  • Ngambi Victor Hingue

    (University of N’Djamena, Chad)

  • Jean Claude Doumnang Mbaigané

    (University of N’Djamena, Chad)

  • Mbaguedje Diondoh

    (Adam Barka University of Abéche, Chad)

  • Diontar Mbaihoudou

    (Mongo Polytechnic University, Chad)

Abstract

Work in the Farchana-Hadjerhadid sector is focused on petrography, with the main aim of mapping the geological formations of the eastern Ouaddaï Massif in order to identify petrographic types and gain an understanding of the geodynamic history of this area. The fieldwork showed that the Farchana-Hadjerhadid granitoids consist mainly of granites and diorites and are intersected by numerous pegmatite veins. Microscopic observation shows that the diorite is made up of plagioclase, amphibole, biotite, and quartz. The granite is composed of alkali feldspar, quartz, amphibole, plagioclase, and biotite. The granitoids in the study area are moderately differentiated (SiO2 = 55.62% to 71.67%) and belong to the medium to highly potassic calc-alkaline series. They are ferriferous type I metaluminous granitoids (A/CNK

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Handle: RePEc:epw:ejgeo0:v:5:y:2024:i:4:id:16473
DOI: 10.24018/ejgeo.2024.5.4.473
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