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Geochemical and Sr-Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting

文献类型：期刊论文

作者Sakyi, Patrick Asamoah1; Anum, Solomon1,2; Su, Ben-Xun3; Nude, Prosper M.1; Su, Ben-Can4; Asiedu, Daniel Kwadwo1; Nyame, Frank1; Kwayisi, Daniel1
刊名GEOLOGICAL JOURNAL
出版日期2018-03-01
卷号53期号:2页码:725-741
关键词Birimian metavolcanics island arc Sr-Nd isotopes subduction tectonic setting West African Craton
ISSN号0072-1050
DOI10.1002/gj.2923
文献子类Article
英文摘要Metavolcanics and mafic intrusive rocks of the Paleoproterozoic Birimian terrane in the southeastern part of the West African Craton, Ghana, were analyzed for major and trace elements and Nd and Sr isotopic data to constrain the geodynamic evolution of the Birimian Supergroup. The metavolcanic rocks consist of metabasalts, meta-andesites, and amphibolites, whereas the mafic intrusions are mainly gabbros, hornblendites, and dolerites. The rocks are tholeiitic in composition and show the classic features of arc magmatism. The metavolcanics display significant enrichments in large ion lithophile elements (LILE) and light rare earth elements, relative to high field strength elements (HFSE) and heavy rare earth elements. The multielement patterns of the rocks also show positive Pb, Ba, Th, and Sr and negative Nb, Ta, and Ce anomalies that are typical characteristics of subduction-related magmas. They also have La/Nb ratios <3 and La/Ta ratios <43 that are similar to other Archean and Birimian greenstone belts in West Africa. The rocks have epsilon(Nd) (2.1Ga) values of -0.96 to +2.60, and Nd model ages of 2.24-2.51Ga (T-DM1) and 2.16-2.45Ga (T-DM2), indicating their juvenile character with possible contributions from pre-Birimian crustal materials in their sources. The epsilon(Nd) values suggest a depleted source and further indicate that they were probably produced in an almost entirely oceanic environment with minor influence from the continental crust. The Nd isotopic results are consistent with the island arc model, which views Paleoproterozoic terranes of the West African Craton in the context of subduction-accretion processes. Accordingly, these processes may have played a role in the formation of the Columbia supercontinent during the Paleoproterozoic (2.1-1.8Ga) orogenic events.
WOS关键词ARCHEAN-PROTEROZOIC BOUNDARY ; CENTRAL COTE-DIVOIRE ; U-PB ; CRUSTAL EVOLUTION ; 2.1 GA ; GREENSTONE-BELT ; VOLCANIC-ROCKS ; MESOPROTEROZOIC SUPERCONTINENT ; BIRIMIAN SUPERGROUP ; CONTINENTAL-CRUST
WOS研究方向Geology
语种英语
WOS记录号WOS:000426504300018
出版者WILEY
资助机构National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; National Natural Science Foundation of China(41522203) ; National Natural Science Foundation of China(41522203) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2016067)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82860]  
专题中国科学院地质与地球物理研究所
通讯作者Sakyi, Patrick Asamoah
作者单位1.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon, Accra, Ghana
2.Geol Survey Dept, Accra, Ghana
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.Changqing Oil Field Co Oil Prod Plant 8, Xian, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Sakyi, Patrick Asamoah,Anum, Solomon,Su, Ben-Xun,et al. Geochemical and Sr-Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting[J]. GEOLOGICAL JOURNAL,2018,53(2):725-741.
APA Sakyi, Patrick Asamoah.,Anum, Solomon.,Su, Ben-Xun.,Nude, Prosper M..,Su, Ben-Can.,...&Kwayisi, Daniel.(2018).Geochemical and Sr-Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting.GEOLOGICAL JOURNAL,53(2),725-741.
MLA Sakyi, Patrick Asamoah,et al."Geochemical and Sr-Nd isotopic records of Paleoproterozoic metavolcanics and mafic intrusive rocks from the West African Craton: Evidence for petrogenesis and tectonic setting".GEOLOGICAL JOURNAL 53.2(2018):725-741.

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来源：地质与地球物理研究所

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