Multistage gold mineralization in the Wa-Lawra greenstone belt, NW Ghana: The Bepkong deposit

Amponsah, Prince Ofori; Salvi, Stefano; Béziat, Didier; Baratoux, Lenka; Siebenaller, Luc; Jessell, Mark; Nude, Prosper M.; Gyawu, Eugene Adubofour

doi:10.1016/j.jafrearsci.2016.05.005

Cited by 24 publications

(32 citation statements)

References 37 publications

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“…The Wa-Lawra greenstone belt in NW Ghana forms a section of the Eastern Paleoproterozoic Birimian terrane within the WAC (Amponsah et al, 2016;Block et al, 2015;Griffis, Barning, Agezo, & Akosah, 2002). This Paleoproterozoic Birimian geology extends into countries such as Burkina Faso, Ivory Coast, Mali, Niger and Ghana.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Wa-Lawra greenstone belt trends N-S (Kesse, 1985;Somakin and Lashmanov, 1991) in Ghana whilst all other belts trends NE-SW. It is the southern extension of the N-S trending Bromo belt which runs from Burkina Faso into Ghana (Amponsah et al, 2016;Baratoux et al, 2011). The Wa-Lawra belt in Ghana is bounded by the Diebougou-Bouna granitoid domain to the west in Ivory Coast.…”

Section: Geological Settingmentioning

confidence: 99%

“…In the south, it is bounded by the Bole-Nagondi belt and the Bole-Bulenga domain. According to Block et al (2015) and Amponsah et al (2015Amponsah et al ( , 2016, the Wa-Lawra belt is divided into two halves, with each half juxtaposed by the crustal-scale transcurrent sinistral Jirapa fault. Jirapa faults crosscuts the Bole-Bolenga domain and integrates with the Bole-Nagondi belt in the south (Block et al, 2015;DeKock et al, 2012).…”

Section: Geological Settingmentioning

confidence: 99%

“…P-T conditions obtained from mica schist in the eastern half from a chlorite-quartz-water (Chl-Qz-H 2 O) and phengitequartz-water (Ph-Qz-H 2 O) equilibria defined a P-T space of 310-380ºC at 2 kbar (Block et al, 2015). Based on micro-thermometric analysis done, CH 4 -H 2 O ± SO 2 and H 2 O-CH 4 -CO 2 -SO 2 fluid inclusions by Amponsah et al (2016) indicated that greenschist facies hydrothermal fluids circulated in the rock at temperatures 310 to 370ºC. The eastern half of the Wa-Lawra belt is composed of amphibolite, para and ortho-gneisses, granitoids and rhyolites (Amponsah et al, 2016;Block et al, 2015).…”

Section: Geological Settingmentioning

confidence: 99%

“…This study aims at (i) defining the geochemical features of the Figure 2. Geological map of the study area modified after Amponsah et al (2016), showing the various gold camps (where the samples were collected). Insert showing a map of northwestern Ghana showing the surrounding rock units modified after Petersson, Scherstén, and Gerdes (2018).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical constraints on provenance and source area weathering of metasedimentary rocks from the Paleoproterozoic (~2.1 Ga) Wa-Lawra Belt, southeastern margin of the West African Craton

Asiedu

Agoe²,

Amponsah

et al. 2019

Geodinamica Acta

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The Wa-Lawra Belt which is situated in the northern part of Ghana consists of Paleoproterozoic Birimian fine metasedimentary rocks metamorphosed to greenschist facies, particularly, in the western part. A whole-rock geochemical study of these metasedimentary rocks was undertaken to unravel their source area weathering, provenance and tectonic setting. Geochemical characteristics of the studied shales show that they are immature in nature and first cycle in origin, with little or no recycled component. Compared to Post-Archaean Australian Shales (PAAS), the studied shales indicate reduction in Zr, Hf, La, Nb, Th and Ta being the high field strength elements and evidences of transition metal enrichments in V, Ni, Sc, Co, and Cr. Major element geochemistry indicates that the shales were subjected to slight potassium metasomatism after deposition. Pre-metasomatized Chemical Index of Alteration calculations indicates that weak to moderate degree of chemical weathering took place at the sediment source area. Co-Th-La-Sc systematics reveals a combination of mafic and felsic provenances for the shales. Eu/Eu* together with values of Th/U and some abundances of trace elements show that the shales were mainly derived from juvenile rocks. Average REE model calculations suggest that the source materials are composed of about 49% basalt, 16% TTG and 35% granite.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemical constraints on provenance and source area weathering of metasedimentary rocks from the Paleoproterozoic (~2.1 Ga) Wa-Lawra Belt, southeastern margin of the West African Craton

Asiedu

Agoe²,

Amponsah

et al. 2019

Geodinamica Acta

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Neodymium isotope composition of Palaeoproterozoic Birimian shales from the Wa‐Lawra Belt, north‐west Ghana: Constraints on provenance

et al. 2020

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isotopic study was carried out on Palaeoproterozoic Birimian shales from the Wa-Lawra volcanic belt, located in the southeastern margin of the West African Craton. The objective of this study was to assess the nature and average crustal residence ages of the source areas, and deduce the provenance of these shales.Nd-model ages range from 2.12 to 2.58 Ga, which are within the range of Nd-model ages reported for the Birimian volcanic rocks, suggesting that the Birimian volcanic rocks are the main sources of detritus for the Birimian shales. The ε Nd values of the Birimian shales, calculated at an age of 2.1 Ga, which represents the time of the deposition of the Birimian shales, ranges from −1.65 to +3.01. The range of observed

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New evidence for crustal reworking and juvenile arc‐magmatism during the Palaeoproterozoic Eburnean events in the Suhum Basin, South‐east Ghana

et al. 2023

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Contrary to what is currently known, archetypal zircon samples from gneisses and intrusive leucogranites in the Palaeoproterozoic Suhum Basin, SE Ghana, suggest the involvement of Neoarchean crustal material in the formation of the Palaeoproterozoic juvenile crust of the Birimian terranes in Ghana. The zircons dated using U–Pb dating methods and subjected to Lu–Hf isotopic analysis suggest that crustal‐forming events from different contemporaneous magmatic episodes within the Suhum Basin took place over a time interval of 139 Ma from 2224 to 2085 Ma. Whole‐rock Lu–Hf data obtained for the gneissic and leucogranitic rocks gave model ages (TDM2) ranging from 2789 to 2456 Ma with ɛHf(t) values ranging from −1.1 to +5.4. These model ages imply that the magmas that formed these rocks were sourced from the early Palaeoproterozoic juvenile mantle with substantial Neoarchean crustal reworking.

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Multistage gold mineralization in the Wa-Lawra greenstone belt, NW Ghana: The Bepkong deposit

Cited by 24 publications

References 37 publications

Geochemical constraints on provenance and source area weathering of metasedimentary rocks from the Paleoproterozoic (~2.1 Ga) Wa-Lawra Belt, southeastern margin of the West African Craton

Geochemical constraints on provenance and source area weathering of metasedimentary rocks from the Paleoproterozoic (~2.1 Ga) Wa-Lawra Belt, southeastern margin of the West African Craton

Neodymium isotope composition of Palaeoproterozoic Birimian shales from the Wa‐Lawra Belt, north‐west Ghana: Constraints on provenance

New evidence for crustal reworking and juvenile arc‐magmatism during the Palaeoproterozoic Eburnean events in the Suhum Basin, South‐east Ghana

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