Geochemistry and geochronology of granitoids in the Kibi-Asamankese area of the Kibi-Winneba volcanic belt, southern Ghana

Anum, Solomon; Sakyi, Patrick Asamoah; Su, Ben‐Xun; Nude, Prosper M.; Nyame, Frank K.; Asiedu, Daniel K.; Kwayisi, Daniel

doi:10.1016/j.jafrearsci.2014.11.007

Cited by 21 publications

(15 citation statements)

References 49 publications

(69 reference statements)

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“…Geological sketch map of the Kibi‐Asamankese area showing the distribution of the various rock units (modified after Anum et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Settingmentioning

confidence: 99%

“…The Paleoproterozoic Birimian rocks and associated syn-to latekinematic intrusions mark a major juvenile crust-forming event referred to as the "Eburnean orogeny" (Dabo & Aïfa, 2011). Geochronological Feybesse et al, 2006) [Colour figure can be viewed at wileyonlinelibrary.com] studies indicate ages ranging from 2.27 to 2.05 Ga (Taylor, Moorbath, Leube, & Hirdes, 1988, 1992Abouchami et al, 1990;Liégois et al, 1991;Boher et al, 1992;Hirdes et al, 1992Hirdes et al, , 1996Davis et al, 1994;Ama Salah et al, 1996;Bossière, Bonkoungou, Peucat, & Pupin, 1996;Kouamelan, 1996;Kouamelan, Peucat, & Delor, 1997;Doumbia et al, 1998;Hirdes & Davis, 1998;Loh & Hirdes, 1999;Sakyi et al, 2014;Anum et al, 2015). In southern and northeastern Ghana and southeast Côte d'Ivoire, the basin and belts of the Paleoproterozoic Birimian terrane are NE-SW trending (Figure 2).…”

Section: Geological Settingmentioning

confidence: 99%

“…The volcanic belts constitute mainly low-grade metamorphosed lavas of predominantly tholeiitic composition, minor amphibolites, as well as "Belt type" tonalite-granodiorite intrusions. Zircon U-Pb geochronology of some of the granitic plutons yielded ages of 2179 Ma (Sefwi Belt) and 2172 Ma (Ashanti Belt; FIGURE 2 Geological sketch map of the Kibi-Asamankese area showing the distribution of the various rock units (modified after Anum et al, 2015) [Colour figure can be viewed at wileyonlinelibrary.com] Hirdes et al, 1992). Sakyi et al (2014) The Kibi segment of the belt forms the Atiwa mountain range, which extends for more than 70 km.…”

Section: Geological Settingmentioning

confidence: 99%

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Geochemical and Sr‐Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

Sakyi

Anum

et al. 2017

Geological Journal

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Metavolcanics and mafic intrusive rocks of the Paleoproterozoic Birimian terrane in the southeastern part of the West African Craton, Ghana, were analyzed for major and trace elements and Nd and Sr isotopic data to constrain the geodynamic evolution of the Birimian Supergroup. The metavolcanic rocks consist of metabasalts, meta‐andesites, and amphibolites, whereas the mafic intrusions are mainly gabbros, hornblendites, and dolerites. The rocks are tholeiitic in composition and show the classic features of arc magmatism. The metavolcanics display significant enrichments in large ion lithophile elements (LILE) and light rare earth elements, relative to high field strength elements (HFSE) and heavy rare earth elements. The multielement patterns of the rocks also show positive Pb, Ba, Th, and Sr and negative Nb, Ta, and Ce anomalies that are typical characteristics of subduction‐related magmas. They also have La/Nb ratios <3 and La/Ta ratios <43 that are similar to other Archean and Birimian greenstone belts in West Africa. The rocks have εNd (2.1 Ga) values of −0.96 to +2.60, and Nd model ages of 2.24–2.51 Ga (TDM1) and 2.16–2.45 Ga (TDM2), indicating their juvenile character with possible contributions from pre‐Birimian crustal materials in their sources. The εNd values suggest a depleted source and further indicate that they were probably produced in an almost entirely oceanic environment with minor influence from the continental crust. The Nd isotopic results are consistent with the island arc model, which views Paleoproterozoic terranes of the West African Craton in the context of subduction–accretion processes. Accordingly, these processes may have played a role in the formation of the Columbia supercontinent during the Paleoproterozoic (2.1–1.8 Ga) orogenic events.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Geochemical and Sr‐Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

Sakyi

Anum

et al. 2017

Geological Journal

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“…The Palaeoproterozoic Birimian Terrane of Ghana occupies the southeastern portion of the WAC, and this area has been subject to much research (e.g. Abouchami et al 1990;Taylor et al 1992;Davis et al 1994;Anum et al 2015;Block et al 2015), all aimed at contributing to the better understanding of the geodynamic evolution of the WAC. However, the geochronology, petrogenesis, provenance and tectonic setting of the Palaeoproterozoic Birimian rocks remain the focus of continuous discussion.…”

Section: Introductionmentioning

confidence: 99%

“…Asiedu et al 2017) or the granitoids (e.g. Losiak et al 2013;Anum et al 2015;Petersson et al 2016) mostly in southern Ghana.…”

Section: Introductionmentioning

confidence: 99%

Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana

Sakyi

Manu

et al. 2020

Geol. Mag.

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The Palaeoproterozoic Birimian Supergroup of the West African Craton (WAC) consists of volcanic belts composed predominantly of basaltic and andesitic rocks and intervening sedimentary basins composed predominantly of wackes and argillites. Mafic metavolcanic rocks and granitoid-hosted enclaves from the Palaeoproterozoic Lawra Belt of Ghana were analysed for geochemical and Sr–Nd isotopic data to constrain the geological evolution of the southeastern part of the WAC. The metavolcanic rocks display mainly tholeiitic signatures, whereas the enclaves show calc-alkaline signatures. The high SiO2 contents (48.6–68.9 wt%) of the enclaves are suggestive of their evolved character. The high Th/Yb values of the samples relative to that of the mantle array may indicate derivation of their respective magmas from subduction-modified source(s). The rocks show positive εNd values of +0.79 to +2.86 (metavolcanic rocks) and +0.79 to +1.82 (enclaves). These signatures and their Nd model ages (TDM2) of 2.31–2.47 Ga (metavolcanic rocks) and 2.39–2.47 Ga (enclaves) suggest they were probably derived from juvenile mantle-derived protoliths, with possible input of subducted pre-Birimian (Archean?) rocks in their source(s). Their positive Ba–Th and negative Nb–Ta, Zr–Hf and Ti anomalies may indicate their formation through subduction-related magmatism consistent with an arc setting. We propose that the metavolcanic rocks and enclaves from the Lawra Belt formed in a similar island-arc setting. We infer that the granitoids developed through variable degrees of mixing/mingling between basic magma and granitic melt during subduction, when blobs of basic to intermediate parental magma became trapped in the granitic magma to form the enclaves.

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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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Geochemistry and geochronology of granitoids in the Kibi-Asamankese area of the Kibi-Winneba volcanic belt, southern Ghana

Cited by 21 publications

References 49 publications

Geochemical and Sr‐Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

Geochemical and Sr‐Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana

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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