Intrusion-related affinity and orogenic gold overprint at the Paleoproterozoic Bonikro Au–(Mo) deposit (Côte d’Ivoire, West African Craton)

Quentin Masurel; Nicolas Thébaud; Andrew Allibone; Anne Sylvie André-Mayer; Kim A.A. Hein; Laurie Reisberg; Olivier Bruguier; Aurélien Eglinger; John Miller

doi:10.1007/s00126-019-00888-2

Intrusion-related affinity and orogenic gold overprint at the Paleoproterozoic Bonikro Au–(Mo) deposit (Côte d’Ivoire, West African Craton)

Quentin Masurel, Nicolas Thébaud, Andrew Allibone, Anne Sylvie André-Mayer, Kim A.A. Hein, Laurie Reisberg, Olivier Bruguier, Aurélien Eglinger, John Miller

School of Earth and Oceans

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The Bonikro gold deposit and satellite Hiré open pits are located at the southern tip of the Oumé-Féttékro granite–greenstone belt in Côte d’Ivoire. Country rocks in the region have undergone polyphase deformation and prolonged arc magmatism during the Paleoproterozoic Eburnean orogeny. Intrusive host rocks at Hiré and Bonikro have been dated at 2180 ± 6 and 2086 ± 4 Ma (U–Pb on zircon), respectively. These plutonic bodies acted as favourable sites for fluid flow due to their brittle rheological characteristics. Gold mineralisation at Bonikro is hosted by (i) a sheeted quartz vein array characterised by an Au–W–Bi–Te–Ag metal association, in the cupola of a porphyritic granodiorite; and (ii) an overprinting swarm of fault-fill smoky quartz–(molybdenite) veins. Gold mineralisation at Hiré is shear-hosted and shares a similar relative timing with the latter set of auriferous veins. This second phase of gold mineralisation occurred during a period of transcurrent tectonics late in the Eburnean tectono-magmatic history, soon after the cessation of compressional deformation. It is responsible for the bulk of gold resources in the region (e.g. Bonikro, Hiré, Agbahou) and has been dated at 2074 ± 16 Ma (Re–Os on molybdenite). The integration of structural–paragenetic relationships with high precision dating of magmatic and hydrothermal events highlights the superposition of late Eburnean orogenic gold mineralisation on an earlier intrusion-related gold system linked to the local emplacement of a porphyritic granodiorite at Bonikro and illustrates the genetic diversity of Paleoproterozoic granitoid-hosted gold mineralisation in the West African Craton. It also further supports that gold mineralisations in the West African Craton occurred diachronously throughout the Eburnean orogeny through a variety of deposit types including Au-skarn, intrusion-related Au, orogenic Au, and porphyry Cu–Au.

Original language	English
Pages (from-to)	557-580
Number of pages	24
Journal	Mineralium Deposita
Volume	57
Issue number	4
DOIs	https://doi.org/10.1007/s00126-019-00888-2
Publication status	Published - Apr 2022

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@article{f20449ea7b7b4a2aa6f43fe58e0297a0,

title = "Intrusion-related affinity and orogenic gold overprint at the Paleoproterozoic Bonikro Au–(Mo) deposit (C{\^o}te d{\textquoteright}Ivoire, West African Craton)",

abstract = "The Bonikro gold deposit and satellite Hir{\'e} open pits are located at the southern tip of the Oum{\'e}-F{\'e}tt{\'e}kro granite–greenstone belt in C{\^o}te d{\textquoteright}Ivoire. Country rocks in the region have undergone polyphase deformation and prolonged arc magmatism during the Paleoproterozoic Eburnean orogeny. Intrusive host rocks at Hir{\'e} and Bonikro have been dated at 2180 ± 6 and 2086 ± 4 Ma (U–Pb on zircon), respectively. These plutonic bodies acted as favourable sites for fluid flow due to their brittle rheological characteristics. Gold mineralisation at Bonikro is hosted by (i) a sheeted quartz vein array characterised by an Au–W–Bi–Te–Ag metal association, in the cupola of a porphyritic granodiorite; and (ii) an overprinting swarm of fault-fill smoky quartz–(molybdenite) veins. Gold mineralisation at Hir{\'e} is shear-hosted and shares a similar relative timing with the latter set of auriferous veins. This second phase of gold mineralisation occurred during a period of transcurrent tectonics late in the Eburnean tectono-magmatic history, soon after the cessation of compressional deformation. It is responsible for the bulk of gold resources in the region (e.g. Bonikro, Hir{\'e}, Agbahou) and has been dated at 2074 ± 16 Ma (Re–Os on molybdenite). The integration of structural–paragenetic relationships with high precision dating of magmatic and hydrothermal events highlights the superposition of late Eburnean orogenic gold mineralisation on an earlier intrusion-related gold system linked to the local emplacement of a porphyritic granodiorite at Bonikro and illustrates the genetic diversity of Paleoproterozoic granitoid-hosted gold mineralisation in the West African Craton. It also further supports that gold mineralisations in the West African Craton occurred diachronously throughout the Eburnean orogeny through a variety of deposit types including Au-skarn, intrusion-related Au, orogenic Au, and porphyry Cu–Au.",

keywords = "Bonikro, Eburnean orogeny, Intrusion-related gold, Orogenic gold",

author = "Quentin Masurel and Nicolas Th{\'e}baud and Andrew Allibone and Andr{\'e}-Mayer, {Anne Sylvie} and Hein, {Kim A.A.} and Laurie Reisberg and Olivier Bruguier and Aur{\'e}lien Eglinger and John Miller",

year = "2022",

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doi = "10.1007/s00126-019-00888-2",

language = "English",

volume = "57",

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T1 - Intrusion-related affinity and orogenic gold overprint at the Paleoproterozoic Bonikro Au–(Mo) deposit (Côte d’Ivoire, West African Craton)

AU - Masurel, Quentin

AU - Thébaud, Nicolas

AU - Allibone, Andrew

AU - André-Mayer, Anne Sylvie

AU - Hein, Kim A.A.

AU - Reisberg, Laurie

AU - Bruguier, Olivier

AU - Eglinger, Aurélien

AU - Miller, John

PY - 2022/4

Y1 - 2022/4

N2 - The Bonikro gold deposit and satellite Hiré open pits are located at the southern tip of the Oumé-Féttékro granite–greenstone belt in Côte d’Ivoire. Country rocks in the region have undergone polyphase deformation and prolonged arc magmatism during the Paleoproterozoic Eburnean orogeny. Intrusive host rocks at Hiré and Bonikro have been dated at 2180 ± 6 and 2086 ± 4 Ma (U–Pb on zircon), respectively. These plutonic bodies acted as favourable sites for fluid flow due to their brittle rheological characteristics. Gold mineralisation at Bonikro is hosted by (i) a sheeted quartz vein array characterised by an Au–W–Bi–Te–Ag metal association, in the cupola of a porphyritic granodiorite; and (ii) an overprinting swarm of fault-fill smoky quartz–(molybdenite) veins. Gold mineralisation at Hiré is shear-hosted and shares a similar relative timing with the latter set of auriferous veins. This second phase of gold mineralisation occurred during a period of transcurrent tectonics late in the Eburnean tectono-magmatic history, soon after the cessation of compressional deformation. It is responsible for the bulk of gold resources in the region (e.g. Bonikro, Hiré, Agbahou) and has been dated at 2074 ± 16 Ma (Re–Os on molybdenite). The integration of structural–paragenetic relationships with high precision dating of magmatic and hydrothermal events highlights the superposition of late Eburnean orogenic gold mineralisation on an earlier intrusion-related gold system linked to the local emplacement of a porphyritic granodiorite at Bonikro and illustrates the genetic diversity of Paleoproterozoic granitoid-hosted gold mineralisation in the West African Craton. It also further supports that gold mineralisations in the West African Craton occurred diachronously throughout the Eburnean orogeny through a variety of deposit types including Au-skarn, intrusion-related Au, orogenic Au, and porphyry Cu–Au.

AB - The Bonikro gold deposit and satellite Hiré open pits are located at the southern tip of the Oumé-Féttékro granite–greenstone belt in Côte d’Ivoire. Country rocks in the region have undergone polyphase deformation and prolonged arc magmatism during the Paleoproterozoic Eburnean orogeny. Intrusive host rocks at Hiré and Bonikro have been dated at 2180 ± 6 and 2086 ± 4 Ma (U–Pb on zircon), respectively. These plutonic bodies acted as favourable sites for fluid flow due to their brittle rheological characteristics. Gold mineralisation at Bonikro is hosted by (i) a sheeted quartz vein array characterised by an Au–W–Bi–Te–Ag metal association, in the cupola of a porphyritic granodiorite; and (ii) an overprinting swarm of fault-fill smoky quartz–(molybdenite) veins. Gold mineralisation at Hiré is shear-hosted and shares a similar relative timing with the latter set of auriferous veins. This second phase of gold mineralisation occurred during a period of transcurrent tectonics late in the Eburnean tectono-magmatic history, soon after the cessation of compressional deformation. It is responsible for the bulk of gold resources in the region (e.g. Bonikro, Hiré, Agbahou) and has been dated at 2074 ± 16 Ma (Re–Os on molybdenite). The integration of structural–paragenetic relationships with high precision dating of magmatic and hydrothermal events highlights the superposition of late Eburnean orogenic gold mineralisation on an earlier intrusion-related gold system linked to the local emplacement of a porphyritic granodiorite at Bonikro and illustrates the genetic diversity of Paleoproterozoic granitoid-hosted gold mineralisation in the West African Craton. It also further supports that gold mineralisations in the West African Craton occurred diachronously throughout the Eburnean orogeny through a variety of deposit types including Au-skarn, intrusion-related Au, orogenic Au, and porphyry Cu–Au.

KW - Bonikro

KW - Eburnean orogeny

KW - Intrusion-related gold

KW - Orogenic gold

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U2 - 10.1007/s00126-019-00888-2

DO - 10.1007/s00126-019-00888-2

M3 - Article

AN - SCOPUS:85065995700

SN - 0026-4598

VL - 57

SP - 557

EP - 580

JO - Mineralium Deposita

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IS - 4

ER -

Intrusion-related affinity and orogenic gold overprint at the Paleoproterozoic Bonikro Au–(Mo) deposit (Côte d’Ivoire, West African Craton)

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