Geochemical and Nd-isotopic compositions of juvenile-type Paleoproterozoic Birimian sedimentary rocks from southeastern West African Craton (Ghana): Constraints on provenance and tectonic setting

Asiedu, Daniel K.; Asong, Samuel; Atta-Peters, D.; Sakyi, Patrick Asamoah; Su, Ben‐Xun; Dampare, Samuel B.; Anani, Chris Y.

doi:10.1016/j.precamres.2017.07.035

Cited by 22 publications

(18 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our present work, together with previous provenance studies on the Birimian metasedimentary rocks (e.g. Asiedu et al, 2017Asiedu et al, , 2004 shows juvenile geochemical signatures with only minor contribution of an older crustal component. The lack of evidence for incorporation of substantial Archaean Figure 11.…”

Section: Tectonic Settings and Location Of Sourcessupporting

confidence: 81%

“…The abundances of HFSE and the transition metals, and REEs have particularly proved useful in discriminating the source composition of fine-grained metasedimentary rocks (e.g. Asiedu et al, 2017;Roddaz, Debat, & Nikiéma, 2007;Yang, Kyser, & Ansdell, 1998). Compared to PAAS the studied shales show depletion in HFSE such as La, Zr, Hf, Th, Ta, and Nb, and enrichment in transition metals such as Cr, Ni, Co, Sc, and V, suggesting a significant contribution from mafic sources ( Figure 6).…”

Section: Source Rock Compositionmentioning

confidence: 99%

“…Condie, 1993;Taylor & McLennan, 1985). This paper presents the outcome of a bulk-rock geochemical study of Birimian metasediments of the Lawra belt, northwestern Ghana; the scanty geochemical studies of the metasedimentary rocks of the Birimian Supergroup in Ghana have been restricted to southwestern Ghana (Asiedu et al, 2017(Asiedu et al, , 2004. This study aims at (i) defining the geochemical features of the Figure 2.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Tectonic Settings and Location Of Sourcessupporting

confidence: 81%

Section: Source Rock Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The oldest ages recorded in the WAC range from 3.7-3.5 Ga and are scarce. These are mostly inherited ages (Barth et al, 2002;Gouédji et al, 2014;Eglinger et al, 2017;Asiedu et al, 2017;Parra-Avilla et al, 2017;Petersson et al, 2016;, except for the scarce crustal segments present in the Mauritanian part of the Reguibat Shield (Potrel et al, 1996) and in the Guinean part of the Man-Leo Shield (Thiéblemont et al, 2001). In Sierra Leone, Barth et al (2002) reported an age of 3.44 Ga (Re-Os on whole rock) on rocks that the authors described as eclogite.…”

Section: Shieldmentioning

confidence: 98%

Re-evaluation of Leonian and Liberian events in the geodynamical evolution of the Man-Leo Shield (West African Craton)

Koffi

Kouamelan

Allialy

et al. 2020

Precambrian Research

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

“…Dampare et al 2008Dampare et al , 2009Senyah et al 2016), metasedimentary rocks (e.g. 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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Geochemical and Nd-isotopic compositions of juvenile-type Paleoproterozoic Birimian sedimentary rocks from southeastern West African Craton (Ghana): Constraints on provenance and tectonic setting

Cited by 22 publications

References 40 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

Re-evaluation of Leonian and Liberian events in the geodynamical evolution of the Man-Leo Shield (West African Craton)

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

Contact Info

Product

Resources

About