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Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana
Sakyi, Patrick Asamoah1,2; Su, Ben-Xun2; Manu, Johnson1; Kwayisi, Daniel1,3; Anani, Chris Y.1; Alemayehu, Melesse4,5; Malaviarachchi, Sanjeewa P. K.6; Nude, Prosper M.1; Su, Ben-Can7
2020-08-01
Source PublicationGEOLOGICAL MAGAZINE
ISSN0016-7568
Volume157Issue:8Pages:1349-1366
AbstractThe 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 SiO(2)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 epsilon(Nd)values of +0.79 to +2.86 (metavolcanic rocks) and +0.79 to +1.82 (enclaves). These signatures and their Nd model ages (T-DM2) 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.
KeywordWest African Craton Birimian Terrane Lawra Belt Sr-Nd isotopes subduction arc setting
DOI10.1017/S001675681900150X
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 ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution
WOS KeywordND ISOTOPE GEOCHEMISTRY ; KEDOUGOU-KENIEBA INLIER ; BAOULE-MOSSI DOMAIN ; U-PB GEOCHRONOLOGY ; CRUSTAL EVOLUTION ; GREENSTONE-BELT ; VOLCANIC-ROCKS ; COTE-DIVOIRE ; 2.1 GA ; LITHOSPHERIC MANTLE
Language英语
Funding ProjectNational Natural Science Foundation of China[41772055] ; National Natural Science Foundation of China[91755205] ; State Key Laboratory of Lithospheric Evolution[201701]
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 ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000562821000008
PublisherCAMBRIDGE UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97655
Collection矿产资源研究院重点实验室
Corresponding AuthorSakyi, Patrick Asamoah
Affiliation1.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon, Ghana
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
3.Univ Johannesburg, Dept Geol, Johannesburg, South Africa
4.Adama Sci & Technol Univ, Sch Appl Nat Sci, Dept Appl Geol, POB 1888, Adama, Ethiopia
5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
6.Univ Peradeniya, Fac Sci, Dept Geol, Peradeniya 20400, Sri Lanka
7.Changqing Oilfield Co Eighth Oil Prod Plant, PetroChina Co Ltd, Xian 710000, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Sakyi, Patrick Asamoah,Su, Ben-Xun,Manu, Johnson,et al. Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana[J]. GEOLOGICAL MAGAZINE,2020,157(8):1349-1366.
APA Sakyi, Patrick Asamoah.,Su, Ben-Xun.,Manu, Johnson.,Kwayisi, Daniel.,Anani, Chris Y..,...&Su, Ben-Can.(2020).Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana.GEOLOGICAL MAGAZINE,157(8),1349-1366.
MLA Sakyi, Patrick Asamoah,et al."Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana".GEOLOGICAL MAGAZINE 157.8(2020):1349-1366.
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