Review of the Senegalo-Malian shear zone system – Timing, kinematics and implications for possible Au mineralisation styles

Diène, Mouhamadane; Fullgraf, Thomas; Diatta, F.; Gloaguen, Éric; Gueye, Mamadou; Ndiaye, P.

doi:10.1016/j.jafrearsci.2015.05.004

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…The inlier differs from other Palaeoproterozoic terranes in the region by having an abundance of carbonates, with thick sequences (>250 m) in both the Dialé-Daléma Series and Kofi Series, representing the most extensive carbonate exposures in the Birimian of West Africa (Masurel et al, 2016). These domains are separated by terranebounding structures known as the Main Transcurrent Zone (MTZ) and Senegal-Mali Shear Zone (SMSZ) (Diene et al, 2015). The belts have been intruded by calc-alkaline granitoids, ranging from small plutons to large batholiths, typically more abundant in the west.…”

Section: Stratigraphy and Geological Settingmentioning

confidence: 98%

“…These faults affected all lithologies and are often localised at contacts between granites and greenstones (Baratoux et al, 2011). In Mali, a third stage of deformation (D 3 ) is associated with transtensional movement along the D 2 structures and the development of sinistral north-and northwest-trending Riedel shears (Diene et al, 2015).…”

Section: Stratigraphy and Geological Settingmentioning

confidence: 99%

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West African Goldfields

Robertson¹,

Peters²

2016

Episodes

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The West African region has long been known for its gold endowment and gold production. Apart from the last 20 to 30 years, this production was largely derived from informal artisanal workings covering large areas of West Africa. For a period of over a thousand years until 1500 AD, West Africa was the world's most important supplier of gold, much of which formed part of the trans-Sahara trade with the Arab world, whose monetary system was based on gold. Artisanal gold mining is still widespread across West Africa and a significant number of modern gold mines in the region were founded on artisanal mining sites. Aided by regional mapping and geochemical programmes by geological surveys and the UNDP, as well as the dramatic rise in the gold price between 2001 and 2011, the West African region has seen a rapid expansion in gold exploration activity over the last two decades. This resulted in the establishment of new mines in Mali,

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Section: Stratigraphy and Geological Settingmentioning

confidence: 98%

Section: Stratigraphy and Geological Settingmentioning

confidence: 99%

West African Goldfields

Robertson¹,

Peters²

2016

Episodes

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“…since the Archean regarding mineralization areas has also been made (e.g., Onstott et al, 1984;Franceschinis et al 2019, Masquelin et al, 2021. They indicate that most of the areas where mineralization occurs are linked or occupy the boundary between terranes (large-scale shear zones) (e.g., Diène et al, 2015;Masurel et al, 2017). As noted in a simplified sketch (Fig.…”

Section: Introductionmentioning

confidence: 91%

Mineralization and sustainable development in the West African Craton: from field observations to modelling

Aı̈fa

2021

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This Special Publication combines results obtained by interdisciplinary groups from numerous academic institutions working on Paleoproterozoic formations to decipher the origins of the main mineralization resources in the West African Craton (WAC) and their impacts on African economic development. Structural, geophysical, sedimentological, stratigraphical, geochemical, petrophysical and mineralogical analyses have been used to highlight the complexities involved in mineralization emplacement and its origin and evolution within the WAC. Fourteen articles, mainly of basic research carried out in the WAC and surrounding areas, contribute to new knowledge in mineral research with updated references. They show that the geodynamic evolution of the WAC is complex from one area to another: it involves subduction, collision and obduction during several deformation phases ranging from Birimian (2.3-2.0 Ga) to Pan-African (650-450 Ma) events. Mineralization is mainly controlled by tectonics within shear zones, orogenic belts, basins and faulting systems occurring in the various corridors. Mineralized fluid circulation is stressed and injected into appropriate formations and precipitate several types of well-documented ore deposits: porphyry, metal-bearing, volcanogenic massive sulfide, sedimentary exhalative and lateritic. Various modelling techniques, when integrated help to understand the mechanisms of mineralization emplacement, some of which are still a matter of debate. Traditional and industrial exploitation of ore deposits, mainly gold, may inadvertently cause pollution to water tables and rivers, thus affecting the environment including watersheds. The challenge for further studies is mitigation for sustainable development that can be appropriately used to minimize such damage.The aim of this volume is thus to bring new insights to research activities on ore deposits within the WAC.

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“…The Sabodala Goldfield has undergone multiple episodes of Eburnean deformation (Diene et al, [39], Gueye et al, [10]) and is bounded by the NNE-trending SSC to the west, and by the Masato-Makana Fault to the east. The major deformation event within the field as described by previous works (Diene et al, [39], Gueye et al, [10]), was an ENE-WNW shortening event that produced thrusts and upright, NNW-trending, gently plunging folds.…”

Section: Revised Structural Interpretation For the Sabodala Regionmentioning

confidence: 99%

“…The new structural interpretation (Figure 9) has been integrated with the currently defined rock type distributions. This paper uses the recent deformation scheme and ages compiled by Diene et al, [39]; Gueye et al [10]. Sequence repetition is particularly evident where the lower mafic-ultramafic stratigraphy has been uplifted and exposed at the margins of granitic domes.…”

Section: Revised Structural Interpretation For the Sabodala Regionmentioning

confidence: 99%

New Approach of Structural Setting of Gold Deposits in Birimian Volcanic Belt in West African Craton: The Example of the Sabodala Gold Deposit, SE Senegal

Sylla¹,

Gueye²,

Ngom³

2016

IJG

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The Sabodala gold deposit in the Mako volcanic Belt (SE-Senegal, West African Craton) occurs in mafic and ultramafic rocks overlain by clastic sedimentary rocks and felsic volcanic-volcaniclastic sequences. It is a structurally controlled mesothermal vein gold deposit developed in deformed rocks units near the Falombo pluton. The Sabodala Goldfield comprises several faults systems striking N-S to NE-SW. New structural evolution consisting of both thrusting and transcurrent events has been defined for the Sabodala Goldfield. The majority of the gold at Sabodala occurs on the western flank of a large, doubling plunging dome (the Sabodala Antiform) and is also associated with sinistral wrenching that overprints early structures within the Sabodala Mine. The gold bearing veins are hosted by flat lying and NW-trending shear zones. The NW-trending faults acted as transfers syn-gold mineralization, although only discrete segments of these faults were active during the main stage of gold mineralization. Late exhumation resulted in extension along fault zones was responsible for the juxtaposition of medium and low grade metamorphic rocks. The granitic suite of the Falombo pluton is linked to exhumation. Final dextral transpression postdating exhumation produced shearing and folding. Gold lodes developed during brittle deformation are associated with high fluid pressures in a northwest-southeast shortening regime. These are termed mainly the Sabodala deposit, and secondary the Niakafiri and Masato deposits.

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Review of the Senegalo-Malian shear zone system – Timing, kinematics and implications for possible Au mineralisation styles

Cited by 10 publications

References 36 publications

West African Goldfields

West African Goldfields

Mineralization and sustainable development in the West African Craton: from field observations to modelling

New Approach of Structural Setting of Gold Deposits in Birimian Volcanic Belt in West African Craton: The Example of the Sabodala Gold Deposit, SE Senegal

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