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Geochemical and Sr-Nd isotopic data on the Birimian of the Kedougou-Kenieba Inlier (Eastern Senegal): Implications on the Palaeoproterozoic evolution of the West African Craton

2006; Geological Society of South Africa; Volume: 109; Issue: 3 Linguagem: Inglês

10.2113/gssajg.109.3.411

1996-8590

Sabine Pawlig, Mamadou Guèye, R. Klischies, Sarah Schwarz, Klaus Wemmer, Siegfried Siegesmund,

earthquake and tectonic studies

Research Article| September 01, 2006 Geochemical and Sr-Nd isotopic data on the Birimian of the Kedougou-Kenieba Inlier (Eastern Senegal): Implications on the Palaeoproterozoic evolution of the West African Craton Sabine Pawlig; Sabine Pawlig Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany Present address: Nu Instruments Limited., Unit 74, Clywedog Rd South, Wrexham Industrial Estate, Wrexham LL13 9XS, United Kingdom, email: sabine@nu-ins.com Search for other works by this author on: GSW Google Scholar Mamadou Gueye; Mamadou Gueye Institut des Sciences de la Terre, Université Cheikh Anta Diop, Dakar, Senegal, e-mail: mgueye@refer.sn Search for other works by this author on: GSW Google Scholar Ralf Klischies; Ralf Klischies Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Search for other works by this author on: GSW Google Scholar Stefan Schwarz; Stefan Schwarz Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Search for other works by this author on: GSW Google Scholar Klaus Wemmer; Klaus Wemmer Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Search for other works by this author on: GSW Google Scholar Siegfried Siegesmund Siegfried Siegesmund Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Search for other works by this author on: GSW Google Scholar Author and Article Information Sabine Pawlig Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany Present address: Nu Instruments Limited., Unit 74, Clywedog Rd South, Wrexham Industrial Estate, Wrexham LL13 9XS, United Kingdom, email: sabine@nu-ins.com Mamadou Gueye Institut des Sciences de la Terre, Université Cheikh Anta Diop, Dakar, Senegal, e-mail: mgueye@refer.sn Ralf Klischies Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Stefan Schwarz Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Klaus Wemmer Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Siegfried Siegesmund Geoscience Center, Georg-August-University, Goldschmidtstr. 3, 37077 Goettingen, Germany, e-mail: ralkli1234@web.de; sschwar2@gwdg.de; kwemmer@gwdg.de; ssieges@gwdg.de Publisher: Geological Society of South Africa First Online: 09 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2006 Geological Society of South Africa South African Journal of Geology (2006) 109 (3): 411–427. https://doi.org/10.2113/gssajg.109.3.411 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Sabine Pawlig, Mamadou Gueye, Ralf Klischies, Stefan Schwarz, Klaus Wemmer, Siegfried Siegesmund; Geochemical and Sr-Nd isotopic data on the Birimian of the Kedougou-Kenieba Inlier (Eastern Senegal): Implications on the Palaeoproterozoic evolution of the West African Craton. South African Journal of Geology 2006;; 109 (3): 411–427. doi: https://doi.org/10.2113/gssajg.109.3.411 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySouth African Journal of Geology Search Advanced Search Abstract Birimian (Paleoproterozoic) granitoids and associated volcanic and sedimentary rocks from the Kedougou-Kenieba-Inlier (KKI) of Eastern Senegal have been analyzed for their major, trace, REE concentrations and their Sr-Nd isotopic compositions. The calc-alkaline I-type granitoids were previously divided into several structural groups. The new geochemical data, however, do not give evidence for this subdivision into pre-, syn- and post-deformational intrusions. The results demonstrate the juvenile character of the granitic igneous rock suite and its isotopic similarities to the adjacent volcanic Mako and sedimentary Dialé-Daléma Supergroups. The Birimian rocks show uniform juvenile features such as low initial Sr isotopic composition (~0.700 to ~0.704), positive ∑Nd(t) values (2.1 to 4.3) and restricted Nd model ages (~2.0 to ~2.3 Ga). They preclude the contamination of the juvenile Birimian crust of the KKI by notable amounts of reworked Archean crustal material. Comparison with existing data helps to clarify the complex evolution of Birimian Supergroups of the WAC. It can be concluded that the Birimian rocks are the product of a large-scale crustal growth process with large amounts of juvenile crust formed from the depleted mantle in a geodynamic environment compared to modern volcanic arcs. These bimodal volcanic arcs were later accreted to the WAC. 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