Subvertical, linear and progressive deformation related to gold mineralization at the Galat Sufar South deposit, Nubian Shield, NE Sudan

Perret, Julien; Eglinger, Aurélien; André-Mayer, Anne-Sylvie; Aillères, Laurent; Feneyrol, Julien; Hartshorne, Craig; Abanyin, Emmanuel; Bosc, Rémi

doi:10.1016/j.jsg.2020.104032

Cited by 23 publications

(26 citation statements)

References 64 publications

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“…However, there is also some evidence for gold mineralization during the magmatic accretion stage and early amalgamation of the ANS (ca. 830-640 Ma; age compilation by Abdelsalam and Stern, 1996b), such as the first gold event portrayed at the WG03 deposit or the syn-Atmur-Delgo suturing Galat Sufar South gold deposit (Perret et al, 2020). In the latter study, the authors indeed demonstrated that the regional Atmur-Delgo deformation shapes the local structural setting and controls the formation and geometry of ore-shoots from the deposit to the macroscopic scales.…”

Section: Polyphase Gold Dominated By Syn-keraf Shear Zone Mineralization In the Gabgaba Gold Districtmentioning

confidence: 80%

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Tectonic record and gold mineralization in the central part of the Neoproterozoic Keraf suture, Gabgaba district, NE Sudan

Perret

Feneyrol²,

Eglinger

et al. 2021

Journal of African Earth Sciences

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The central Keraf suture recorded complex lithospheric-scale deformation associated with the formation of the Neoproterozoic Arabian-Nubian shield and hosts the WG03, Central Zone and UTM gold deposits, Gabgaba district, northeastern Sudan.This study aims at (i) unravelling the tectonic history recorded by the central Keraf suture and (ii) interpreting the spatial and genetic relationships between structural setting and gold mineralization. To this end, we coupled field petrographic observations and structural measurements made along a 50 km-long geological cross-section through the Gabgaba district with macroscopic and microscopic description of mineralized structures.The structural setting of the central Keraf suture is dominated by progressive deformation, from ductile D1a Keraf thrusting to ductile-brittle D1b sinistral shearing in a prolonged northwest-orientated convergence regime. A first mineralization event, leading to a minor gold endowment, relates to magmatic accretion pre-dating D1a Keraf suturing. The second gold episode is characterized by ore veining as a response to progressive late collisional D1b Keraf strike-slip shearing and may be classified as orogenic gold. Most of the gold budget of the Gabgaba district formed at this stage.In summary, the central Keraf suture exemplifies that the Arabian-Nubian shield contains significant polyphase gold mineralization along lithospheric-scale structures. These structures may record a complex tectonic evolution from magmatic accretion to collision, with a strong structural control on gold endowment.

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Section: Polyphase Gold Dominated By Syn-keraf Shear Zone Mineralization In the Gabgaba Gold Districtmentioning

confidence: 80%

“…The first two (D1/2ADS) relate to Atmur-Delgo suturing and their field expression is limited to the northwestern KS (Fig. 1c; Abdelsalam et al, 1995Abdelsalam et al, , 1998Abdelsalam et al, , 2003Perret et al, 2020). They are not considered further as not identified in our study area.…”

Section: Geological Settingmentioning

confidence: 99%

Tectonic record and gold mineralization in the central part of the Neoproterozoic Keraf suture, Gabgaba district, NE Sudan

Perret

Feneyrol²,

Eglinger

et al. 2021

Journal of African Earth Sciences

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“…GSS is a polyphase, sulphide-dominated, vein-type gold deposit. Mineralisation expression and relationships with deformation events have already been well-constrained from the tens of km-scale to the µm-scale by satellite imagery analysis, field and conventional microscopy work (Perret et al, 2020). Samples of interest analysed in this study have been collected along several diamond drill cores within the East Zone of the GSS gold deposit (Fig.…”

Section: Sudanmentioning

confidence: 99%

“…The GSS gold deposit is encompassed within a complexly deformed zone at the junction between the Atmur-Delgo and Keraf sutures (Fig. 1a), both structures hosting gold occurrences (Johnson et al, 2017;Perret et al, 2020Perret et al, , 2021.…”

Section: Sudanmentioning

confidence: 99%

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Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Perret

André-Mayer

Eglinger

et al. 2021

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Integrating structural control on mineralisation and geochemical ore-forming processes is crucial when studying deformed ore deposits. Yet, structural and geochemical data are rarely acquired at the same scale: structural control on mineralisation is typically investigated from the district to the deposit and macroscopic scales whereas geochemical ore processes are described at the microscopic scale. The deciphering of a deformation-mineralisation history valid at every scale thus remains challenging.This study proposes a multi-scale approach that enables the reconciliation of structural and geochemical information collected at every scale, applied to the example of the Galat Sufar South gold deposit, Nubian shield, northeastern Sudan. It gathers field and laboratory information by coupling a classical petrological-structural study with high-resolution X-ray computed tomography, electron back-scattered diffraction and laser ablation inductively-coupled plasma mass spectrometry on mineralised sulphide mineral assemblages.This approach demonstrates that there is a linear control on mineralisation expressed from the district to microscopic scales at the Galat Sufar South gold deposit. We highlight the relationships between Atmur-Delgo suturing tectonics, micro-deformation of sulphide minerals, syn-pyrite recrystallisation metal remobilisation, gold liberation and ore upgrading. Our contribution therefore represents another step forward a holistic field-to-laboratory approach for the study of any other sulphide-bearing, structurally-controlled ore deposit type.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5635726

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West African Leo‐Man Shield Metallogenic Province

EGLINGER,

ANDRÉ‐MAYER,

THÉBAUD

et al. 2023

Metallic Resources 2

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Subvertical, linear and progressive deformation related to gold mineralization at the Galat Sufar South deposit, Nubian Shield, NE Sudan

Cited by 23 publications

References 64 publications

Tectonic record and gold mineralization in the central part of the Neoproterozoic Keraf suture, Gabgaba district, NE Sudan

Tectonic record and gold mineralization in the central part of the Neoproterozoic Keraf suture, Gabgaba district, NE Sudan

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

West African Leo‐Man Shield Metallogenic Province

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