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Geochemical and Sm-Nd isotopic evidence for the composition of the Palaeoproterozoic crust of the West African Craton in Ghana

文献类型：期刊论文

作者Sakyi, Patrick Asamoah2; Manu, Johnson2; Su, Ben-Xun1; Kwayisi, Daniel2,3; Nude, Prosper M.2; Dampare, Samuel Boakye4
刊名GEOLOGICAL JOURNAL
出版日期2019-11-01
卷号54期号:6页码:3940-3957
关键词Birimian metasediments craton island arc Palaeoproterozoic Sr-Nd isotopes subduction West African
ISSN号0072-1050
DOI10.1002/gj.3387
英文摘要The 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?).
WOS关键词PALEOPROTEROZOIC METAVOLCANIC ROCKS ; SEDIMENTARY-ROCKS ; TRACE-ELEMENT ; 2.1 GA ; METASEDIMENTARY ROCKS ; GREENSTONE-BELT ; VOLCANIC BELT ; GOLD DEPOSIT ; COTE-DIVOIRE ; EVOLUTION
资助项目National Natural Science Foundation of China[41173011]
WOS研究方向Geology
语种英语
WOS记录号WOS:000496020400040
出版者WILEY
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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95700]  
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Manu, Johnson
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, Legon, Ghana
3.Univ Johannesburg, Dept Geol, Johannesburg, South Africa
4.Univ Ghana Atom, Sch Nucl & Allied Sci, Legon, Ghana
推荐引用方式
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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来源：地质与地球物理研究所

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