Record of the oldest vein-type gold mineralization throughout the Neoproterozoic Nubian shield: the Galat Sufar South gold deposit, NE Sudan - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Record of the oldest vein-type gold mineralization throughout the Neoproterozoic Nubian shield: the Galat Sufar South gold deposit, NE Sudan

Aurélien Eglinger
  • Fonction : Auteur
  • PersonId : 1126879
Anne-Sylvie André-Mayer
Julien Feneyrol
  • Fonction : Auteur
  • PersonId : 760910
  • IdRef : 175641005
Jérôme Ganne
  • Fonction : Auteur
Marc Poujol

Résumé

Despite the booming interest in Nubian shield for gold exploration, much more remains to be done to constrain geodynamical settings favorable for gold mineralization in a mineral system approach. Constraining pressure-temperature-timing-deformation (P-T-t-d) conditions relative to the formation of the structurally controlled Galat Sufar South (GSS) deposit is a case in point and represents a step forward in the understanding of the Pan-African gold mineral system along the westernmost Atmur-Delgo suture. The formation of the GSS gold deposit, hosted in an arc-related volcanosedimentary sequence metamorphosed and deformed by sheath folding, occurred at 738±16 Ma (in situ laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb dating of hydrothermal apatite coeval to gold mineralization). Additional chlorite-phengite-quartz-water multi-equilibria calculations in ore-hosting meta-volcanosediments suggest that the gold event occurred under lower amphibolite facies conditions (~7.2 kbar - 420 °C), probably during the tectonic accretion of the sedimentary wedge formed during Atmur-Delgo intra-oceanic subduction. To date, the GSS deposit is the oldest lode gold occurrence documented throughout the Nubian shield and the only one formed at regional peak metamorphism conditions in such a setting.
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Dates et versions

insu-04196593 , version 1 (05-09-2023)

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  • HAL Id : insu-04196593 , version 1

Citer

Julien Perret, Aurélien Eglinger, Anne-Sylvie André-Mayer, Julien Feneyrol, Jérôme Ganne, et al.. Record of the oldest vein-type gold mineralization throughout the Neoproterozoic Nubian shield: the Galat Sufar South gold deposit, NE Sudan. 17th SGA Meeting, Aug 2023, Zürich, Switzerland. ⟨insu-04196593⟩
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