Structure and LA-ICP-MS zircon U–Pb dating of syntectonic plutons emplaced in the Pan-African Banyo-Tcholliré shear zone (central north Cameroon)
作者： Emmanuel Negue Nomo , Rigobert Tchameni , Olivier Vanderhaeghe , Fenguye Sun , Pierre Barbey
DOI: 10.1016/J.JAFREARSCI.2017.04.002
关键词: Zircon 、 Geology 、 Felsic 、 Shear (geology) 、 Pluton 、 Geochemistry 、 Transpression 、 Massif 、 Shear zone 、 Leucogranite
摘要: Abstract The Tchollire massif, in central north Cameroon, consists of elongated granite plutons that crop out along the Pan-African Tchollire-Banyo shear zone (TBSZ), a potential suture within Central Africa Orogenic Belt. New structural and geochronological data on these granites constrain tectonic regime timing TBSZ. consist syntectonic granodiorite containing dioritic mafic enclaves. They show an S2 sub-vertical foliation, trends NE-SW to ENE-WSW. related L2 lineation is subhorizontal shallowly plunging SW or NE. Kinematic indicators such as asymmetric folds, sigmoidal-shape boudins, bands, imbricated feldspar phenocrysts antithetic fractures point sinistral sense shear. Microstructural analysis shows structures are acquired from submagmatic low temperature solid state suggesting progressive deformation magma during its emplacement, crystallization cooling. U-Pb zircon dating this massif yields emplacement ages 719 ± 12 Ma for biotite-amphibole muscovite granite, 652.2 ± 5.4 biotite-granite 632 ± 13 leucogranite. These addition, Palaeoproterozoic inherited 1631 ± 30 leucogranites contribution their genesis. range (ca. 87 Ma) points felsic magmas coeval with transpression TBSZ orogeny. results has recorded prolonged associated crustal magmatism between Adamawa-Yade domain southeast Sinassi-Mayo Kebbi Neoproterozoic magmatic arc Northwest.
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