Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana
文献类型：期刊论文
| 作者 | Sakyi, Patrick Asamoah2,3; Su, Ben-Xun3; Manu, Johnson2; Kwayisi, Daniel2,4; Anani, Chris Y.2; Alemayehu, Melesse5,6; Malaviarachchi, Sanjeewa P. K.7; Nude, Prosper M.2; Su, Ben-Can1 |
| 刊名 | GEOLOGICAL MAGAZINE
 |
| 出版日期 | 2020-08-01 |
| 卷号 | 157期号:8页码:1349-1366 |
| ISSN号 | 0016-7568 |
| 关键词 | West African Craton Birimian Terrane Lawra Belt Sr-Nd isotopes subduction arc setting |
| DOI | 10.1017/S001675681900150X |
| 英文摘要 | 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 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. |
| WOS关键词 | ND ISOTOPE GEOCHEMISTRY ; KEDOUGOU-KENIEBA INLIER ; BAOULE-MOSSI DOMAIN ; U-PB GEOCHRONOLOGY ; CRUSTAL EVOLUTION ; GREENSTONE-BELT ; VOLCANIC-ROCKS ; COTE-DIVOIRE ; 2.1 GA ; LITHOSPHERIC MANTLE |
| 资助项目 | National Natural Science Foundation of China[41772055] ; National Natural Science Foundation of China[91755205] ; State Key Laboratory of Lithospheric Evolution[201701] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | CAMBRIDGE UNIV PRESS |
| WOS记录号 | WOS:000562821000008 |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/97655]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Sakyi, Patrick Asamoah |
| 作者单位 | 1.Changqing Oilfield Co Eighth Oil Prod Plant, PetroChina Co Ltd, Xian 710000, Peoples R China 2.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon, Ghana 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China 4.Univ Johannesburg, Dept Geol, Johannesburg, South Africa 5.Adama Sci & Technol Univ, Sch Appl Nat Sci, Dept Appl Geol, POB 1888, Adama, Ethiopia 6.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 7.Univ Peradeniya, Fac Sci, Dept Geol, Peradeniya 20400, Sri Lanka |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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