LiveZilla Live Chat Software

Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Structural setting and fluid composition of gold mineralization along the central segment of the Keraf suture, Neoproterozoic Nubian Shield, Sudan: implications for the source of gold

Gaboury Damien, Nabil Hassan, Ennaciri Aomar et Maacha Lhou. (2020). Structural setting and fluid composition of gold mineralization along the central segment of the Keraf suture, Neoproterozoic Nubian Shield, Sudan: implications for the source of gold. International Geology Review, 2020, p. 1-27.

[img]
Prévisualisation
PDF - Version acceptée
868kB
[img]
Prévisualisation
PDF - Version acceptée
383kB
[img]
Prévisualisation
PDF - Version acceptée
3MB
[img]
Prévisualisation
PDF - Version acceptée
578kB
[img]
Prévisualisation
PDF - Version acceptée
280kB
[img]
Prévisualisation
PDF - Version acceptée
547kB
[img]
Prévisualisation
PDF - Version acceptée
677kB
[img]
Prévisualisation
PDF - Version acceptée
209kB
[img]
Prévisualisation
PDF - Version acceptée
697kB
[img]
Prévisualisation
PDF - Version acceptée
412kB
[img]
Prévisualisation
PDF - Version acceptée
275kB
[img]
Prévisualisation
PDF - Version acceptée
257kB
[img]
Prévisualisation
PDF - Version acceptée
405kB
[img]
Prévisualisation
PDF - Version acceptée
625kB

URL officielle: http://dx.doi.org/doi:10.1080/00206814.2020.183833...

Résumé

We provide the first large field investigation of more than 20 gold deposits and sites along the Keraf suture zone, covering an area of ~15,000 km2. The area shows diverse structural settings for gold mineralization in greenschist, amphibolite, and hornfels metamorphosed rocks. The reverse fault and dyke-hosted settings appear to be the most favourable for forming gold deposits. Two major N-S-trending, ~300-km-long corridors of deformation are delineated (West and East) but only the West seems important for gold. From fluid inclusions, 6 types of fluids are distinguished based on specific volatile contents and proportions. Most types can be related to fluid evolution by hydrothermal reactions and phase separations from a primitive fluid of metamorphic origin, containing H2O, CO2, N2, CH4, C2H6, and H2. Regional hydrothermal fields are identified based on the combinations of structural settings and fluid types. The northern field is defined as a single large hydrothermal system accounting for the mineralization of the 3 gold deposits (WG-03, UTM and Central). For sites along the West Corridor, such as Toubi, Anas, NW and Shereik, multiple and overlapping hydrothermal systems are necessary to explain the various fluid types and structural settings, even at the deposit scale (Shereik). Conversely, other sites (SW, Yasmine, Korup, Saijd, Dardora, Negeim, and SE) formed by localized individual hydrothermal systems. The documentation of fluids containing ethane at numerous sites and deposits is the most significant outcome. Such ethane-bearing fluids are generated by the metamorphism of carbonaceous-pyritic sedimentary rocks. These rocks are considered one of the best sources for providing ligands and gold for the formation of orogenic gold deposits. Consequently, the Keraf suture zone, composed mainly of carbonaceous turbidites, is interpreted to have provided such source rocks in the suture zone and below the adjacent cratons during the collision, forming orogenic gold deposits (graphical abstract).

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:2020
Pages:p. 1-27
Version évaluée par les pairs:Oui
Date:1 Novembre 2020
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Unités de recherche > Laboratoire de métallogénie expérimentale et quantitative (LAMEQ)
Mots-clés:Orogenic gold deposits, Sudan, Keraf shear zone, gold Source, ethane, solid probe mass spectrometry, Neoproterozoic, structural setting, gisements aurifères orogéniques, Soudan, zone de cisaillement de Keraf, Source d'or, éthane, spectrométrie de masse à sonde solide, Néoprotérozoïque, cadre structural
Déposé le:27 oct. 2021 00:11
Dernière modification:01 nov. 2021 04:10
Afficher les statistiques de telechargements

Éditer le document (administrateurs uniquement)

Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

Bibliothèque Paul-Émile-Boulet, UQAC
555, boulevard de l'Université
Chicoutimi (Québec)  CANADA G7H 2B1
418 545-5011, poste 5630