Geology and geochemistry of the shear-hosted Julie gold deposit, NW Ghana

Amponsah, Prince Ofori; Salvi, Stefano; Béziat, Didier; Siebenaller, Luc; Baratoux, Lenka; Jessell, Mark

doi:10.1016/j.jafrearsci.2015.06.013

Cited by 51 publications

(55 citation statements)

References 62 publications

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“…The Lawra greenstone belt (Figure a) represents the southern part of the Boromo greenstone belt in Burkina Faso (e.g., Amponsah, Salvi, Béziat, Siebenaller, & Jessell, ; Amponsah et al, ). The belt is characterized by rock units and structural features that seem similar to the other greenstone belts that occur in the south and south‐western Ghana (Sakyi et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The belt is characterized by rock units and structural features that seem similar to the other greenstone belts that occur in the south and south‐western Ghana (Sakyi et al, ). In this belt, sedimentary rocks, dominated by shales, greywackes, and volcano–sedimentary rocks, together with the volcanic rocks and granitoids occur in the western part, whereas the rhyolites, granites, and gneisses are found in the east (Amponsah et al, , ). The volcanic suite and metamorphosed sedimentary rocks in the Lawra belt have experienced greenschist facies metamorphism, whereas the gneisses were metamorphosed under amphibolite facies metamorphic conditions (Amponsah et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Lawra greenstone belt (Figure 2a) represents the southern part of the Boromo greenstone belt in Burkina Faso (e.g., Amponsah, Salvi, Béziat, Siebenaller, & Jessell, 2015;Amponsah et al, 2016).…”

Section: Geological Settingmentioning

confidence: 99%

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Geochemical and Sm–Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana

Sakyi

Manu

et al. 2018

Geological Journal

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The metasedimentary rocks of the Sefwi and Lawra volcanic belts in Ghana respectively were analysed for their major and trace elements and Sr‐Nd isotopic compositions to constrain the provenance, palaeo‐weathering conditions, and tectonic setting of the rocks. Geochemical characteristics of the metasedimentary rocks show low to moderate chemical weathering in their source regions and the rocks are interpreted to have been derived from mixture of mafic and felsic rock components. The LREE show much enrichment in relation to the HREE (LaN/LuN, 4.67‐11.66). The εNd (2.1 Ga) values of −0.12 to +3.72 strongly suggest that the source of the sedimentary rocks was derived from a depleted mantle source and that they were most likely produced in an almost entirely oceanic environment with minor influence from the continental crust. The Nd model ages ranging from +2.05 to 2.41 Ga suggest possible contributions of a pre‐Birimian crustal material (or Archaean?) in the source material of the volcanic rocks. The rock types that contributed as detritus to the Birimian metasedimentary rocks were mainly pyroclastics and basalts, and their REE patterns suggest that the contribution to the phyllites can be modelled after 20% basalt, 13% andesite, and 67% dacite. Similarly, the schists can be modelled as a mixture of 16% basalt, 34% andesite, and 50% dacite. The Nd isotopic modeling implies that the bulk of the sedimentary detritus was supplied by the Palaeoproterozoic volcanic arc with contributions of less than 10% from the pre‐Birimian crust (Archaean?).

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Geochemical and Sm–Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana

Sakyi

Manu

et al. 2018

Geological Journal

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“…1); Wa-Lawra Belt (Griffis et al, 2002); and Julie Belt to the north of the area shown in Fig. 1 (Amponsah et al, 2015b). The two main types of mineralisation occurring in these belts are mesothermal quartz-vein associated gold and palaeoplacer gold (e.g.…”

Section: Figure 1: Simplified Geological Map Of Southwestern Ghana Shmentioning

confidence: 94%

A review of the Birimian Supergroup- and Tarkwaian Group-hosted gold deposits of Ghana

Smith¹,

Henry²,

Frost-Killian³

2016

Episodes

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“…The Julie belt is composed of low grade basalts, silicic volcanosediments and granitoids mostly with tonalitic affinities (Amponsah et al, 2015). Dating done on the silicic volcanosediments showed that some of the rocks crystallized at 2129 ± 7 Ma (Block et al, 2015).…”

Section: Geological Summary In North-western Ghanamentioning

confidence: 99%

3-D numerical modelling of the influence of pre-existing faults and boundary conditions on the distribution of deformation: Example of North-Western Ghana

Feng

Amponsah

Martin

et al. 2016

Precambrian Research

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Geology and geochemistry of the shear-hosted Julie gold deposit, NW Ghana

Cited by 51 publications

References 62 publications

Geochemical and Sm–Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana

Geochemical and Sm–Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana

A review of the Birimian Supergroup- and Tarkwaian Group-hosted gold deposits of Ghana

3-D numerical modelling of the influence of pre-existing faults and boundary conditions on the distribution of deformation: Example of North-Western Ghana

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