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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, Patrick Asamoah1; Manu, Johnson1; Su, Ben-Xun2; Kwayisi, Daniel1,4; Nude, Prosper M.1; Dampare, Samuel Boakye3
2019-11-01
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume54Issue:6Pages:3940-3957
AbstractThe 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 (La-N/Lu-N, 4.67-11.66). The epsilon(Nd) (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?).
KeywordBirimian metasediments craton island arc Palaeoproterozoic Sr-Nd isotopes subduction West African
DOI10.1002/gj.3387
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordPALEOPROTEROZOIC METAVOLCANIC ROCKS ; SEDIMENTARY-ROCKS ; TRACE-ELEMENT ; 2.1 GA ; METASEDIMENTARY ROCKS ; GREENSTONE-BELT ; VOLCANIC BELT ; GOLD DEPOSIT ; COTE-DIVOIRE ; EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41173011]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000496020400040
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95700
Collection矿产资源研究院重点实验室
Corresponding AuthorManu, Johnson
Affiliation1.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, Legon, Ghana
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Univ Ghana Atom, Sch Nucl & Allied Sci, Legon, Ghana
4.Univ Johannesburg, Dept Geol, Johannesburg, South Africa
Recommended Citation
GB/T 7714
Sakyi, Patrick Asamoah,Manu, Johnson,Su, Ben-Xun,et al. Geochemical and Sm-Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana[J]. GEOLOGICAL JOURNAL,2019,54(6):3940-3957.
APA Sakyi, Patrick Asamoah,Manu, Johnson,Su, Ben-Xun,Kwayisi, Daniel,Nude, Prosper M.,&Dampare, Samuel Boakye.(2019).Geochemical and Sm-Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana.GEOLOGICAL JOURNAL,54(6),3940-3957.
MLA Sakyi, Patrick Asamoah,et al."Geochemical and Sm-Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana".GEOLOGICAL JOURNAL 54.6(2019):3940-3957.
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