New evidences for an early Birimian evolution in the West African Craton: An example from the Kedougou-Kenieba inlier, southeast Senegal

Abstract

Research Article| December 01, 2007 New evidences for an early Birimian evolution in the West African Craton: An example from the Kédougou-Kénieba inlier, southeast Senegal M. Gueye; M. Gueye Institut des Sciences de la Terre, University Cheikh Anta Diop Dakar, Senegal, e-mail: mgueye@refer.sn Search for other works by this author on: GSW Google Scholar S. Siegesmund; S. Siegesmund Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de Search for other works by this author on: GSW Google Scholar K. Wemmer; K. Wemmer Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de Search for other works by this author on: GSW Google Scholar S. Pawlig; S. Pawlig Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de Search for other works by this author on: GSW Google Scholar M. Drobe; M. Drobe Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de Search for other works by this author on: GSW Google Scholar N. Nolte; N. Nolte Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de Search for other works by this author on: GSW Google Scholar P. Layer P. Layer Geophysical Institute, University of Alaska, Fairbanks, Alaska 99775, United States of America, e-mail: player@qi.alaska.edu Search for other works by this author on: GSW Google Scholar Author and Article Information M. Gueye Institut des Sciences de la Terre, University Cheikh Anta Diop Dakar, Senegal, e-mail: mgueye@refer.sn S. Siegesmund Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de K. Wemmer Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de S. Pawlig Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de M. Drobe Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de N. Nolte Geoscience Center, Georg-August University, Goldschmidtstr. 3, 37077 Göttingen, Germany, e-mail: ssieges@gwdg.de; kwemmer@gwdg.de; sabine@nu.ins.com; mdrode@gwdge.de; Nicole.Nolte@geo.uni-goettingen.de P. Layer Geophysical Institute, University of Alaska, Fairbanks, Alaska 99775, United States of America, e-mail: player@qi.alaska.edu Publisher: Geological Society of South Africa First Online: 09 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2007 Geological Society of South Africa South African Journal of Geology (2007) 110 (4): 511–534. https://doi.org/10.2113/gssajg.110.4.511 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. Gueye, S. Siegesmund, K. Wemmer, S. Pawlig, M. Drobe, N. Nolte, P. Layer; New evidences for an early Birimian evolution in the West African Craton: An example from the Kédougou-Kénieba inlier, southeast Senegal. South African Journal of Geology 2007;; 110 (4): 511–534. doi: https://doi.org/10.2113/gssajg.110.4.511 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 The Paleoproterozoic rocks in the Kédougou Kénieba Inlier (KKI) consist of volcanic and volcanosedimentary rocks intruded by granitoids with a wide compositional spectrum. Geochronological data based on single-grain zircon Pb-Pb evaporation, U-Pb single grain, Ar-Ar and K-Ar dating of several plutons point to a long lasting emplacement history in the KKI. The zircon data presented here yielded Paleoproterozoic ages for the emplacement/crystallization of the Badon granodiorite (2213 ± 3 to 2198 ± 2 Ma), tonalitic gneiss from Sandikounda (2194 ± 4 Ma), the Tinkoto pluton (2074 ± 9 Ma) as well as for the felsic host rocks of the Mamakono pluton (2067 ± 12Ma). The Badon granodiorite, formerly regarded to be relatively young and post-tectonic, is substantially older than all other known KKI intrusions. As a consequence, this new age may constrain the ongoing discussion on the existence of an Early Birimian cycle in the West African Craton (WAC). Ar-Ar and K-Ar ages on hornblende (2112 ± 12 and 2118 ± 31 Ma, respectively, in the tonalitic gneiss from Sandikounda) and biotite (2098 ± 26 and 2090 ± 21 Ma, respectively, in the Badon granodiorite) define an age of ca 2090 Ma, which is interpreted to mark the major tectonomagmatic episode in this part of the WAC. This is confirmed by the Paleoproterozoic ages of the Saraya, Tinkoto and Mamakono granite. A hydrothermal event at 2020 Ma followed the emplacement of the granitoids and caused the alteration of the Saraya granite. The new zircon ages, reflecting the magmatic and tectonothermal events in the study area correlate well with various magmatic and metamorphic events elsewhere in West Africa. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.