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<title lang=en>The Pan-African Kekem gabbro-norite (West-Cameroon), U-Pb zircon age, geochemistry and Sr-Nd isotopes: Geodynamical implication for the evolution of the Central African fold belt</title>
<creator>Kwekam, Maurice</creator>
<creator>Affaton, Pascal</creator>
<creator>Bruguier, Olivier</creator>
<creator>Liegeois, J. P.</creator>
<creator>Hartmann, Gerald</creator>
<creator>Njonfang, Emmanuel</creator>
<contributor>Département des Sciences de la Terre, Faculté des Sciences, Université de Dschang ; Université du Québec</contributor>
<contributor>Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Collège de France (CdF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Manteau et Interfaces ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Musée royal de l'Afrique centrale, Section de géologie isotopique, Tervuren ; Université du Québec</contributor>
<contributor>GZG, Universität Göttingen ; Université du Québec</contributor>
<contributor>Université de Yaoundé I [Yaoundé]</contributor>
<description>International audience</description>
<source>ISSN: 0899-5362</source>
<source>Journal of African Earth Sciences</source>
<publisher>Elsevier</publisher>
<identifier>hal-00903665</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00903665</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00903665</source>
<source>Journal of African Earth Sciences, Elsevier, 2013, 84, pp.70-88. 〈10.1016/j.jafrearsci.2013.03.010〉</source>
<identifier>DOI : 10.1016/j.jafrearsci.2013.03.010</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jafrearsci.2013.03.010</relation>
<language>en</language>
<subject lang=en>Garnet-spinel peridotite</subject>
<subject lang=en>Shoshonitic gabbro-norite</subject>
<subject lang=en>Subduction-related fluid metasomatism</subject>
<subject lang=en>Late post-collision period</subject>
<subject lang=en>West-Cameroon</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Kekem shoshonitic gabbro-norite association is part of the high-K calc-alkaline (HKCA) post-collisional magmatism, a major feature of the Pan-African Belt in Cameroon. LA-ICP-MS U-Pb zircon analyses provide an age of 576 ± 4 Ma for the Kekem complex. This age is interpreted as dating the emplacement of the massif during the waning stage of the Pan-African orogeny. The latter is related to dextral movements along the Central Cameroon Shear Zone (CCSZ). The REE patterns display enriched LREE (LaN/YbN = 14.2-23.5) while HREE present a nearly flat profile (DyN/YbN = 1.3-1.7), and the La/Sm and Sm/Yb ratios led to propose that the Kekem gabbro-norites have been derived from the partial melting of a garnet-spinel lherzolite mantle source. The negative Nb-Ta and Ti anomalies and the positive Pb anomalies indicate that this mantle source was modified by contribution of a subduction-related material. The low Ce/Pb (2.6-10.4) and Th/Yb ratios associated to high Ba/La ratios, indicate that source enrichment could be related to slab derived fluids. As a whole, the Kekem geochemical features suggest that primary gabbro-noritic magmas derived from a subduction-modified mantle source (metasomatised lithospheric mantle). Moderately high 86Sr/87Sr initial ratios (0.7068-0.7082), low εNd (−5 to −9) and old Nd TDM model ages (1.6-1.8 Ga) are interpreted to result from contamination of Neoproterozoic mantle by the Paleoproterozoic crust. The ca. 576 Ma movements along the CCSZ are related to a Neoproterozoic metacratonization of the northern margin of the Congo craton during the Pan-African orogeny. This metacratonization led to vertical planar lithospheric delamination along lithospheric transcurrent faults, asthenospheric uprise and partial melting of the Paleoproterozoic lithospheric mantle.</description>
<date>2013-08</date>
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