GLOBAL JOURNAL OF EARTH AND ENVIRONMENTAL SCIENCE
Integrity Research Journals
ISSN: 2636-6002
Model: Open Access/Peer Reviewed
DOI: 10.31248/GJEES
Start Year: 2016
Email: gjees@integrityresjournals.org
Kinematic evolution of the Pan-African shear zones of South Maradi, southern Niger
https://doi.org/10.31248/GJEES2020.087 | Article Number: 016617043 | Vol.5 (4) - October 2020
Received Date: 13 October 2020 | Accepted Date: 28 October 2020 | Published Date: 30 October 2020
Authors: Souley Baraou Idi* and Moussa Konaté
Keywords: Microstructural study, Pan-African province, Schist belt, Shear zone, South Maradi.
The Pan-African Province (PAP) of south Maradi (Niger) corresponds to the northeastern part of the Benin-Nigerian Shield, which is part of the Pan-African Mobile Belt, located to the East of the West African Craton. This study focuses on the microstructural study supported by geochronological data of the South Maradi Pan-African shear zones. The structural analysis of the Pan-African shear bands, combined with the previous radiometric data allowed to highlight a polyphase history of this northeastern part of the Benin-Nigerian Shield. Two major tectonic periods are highlighted: A ductile to brittle Pan-African deformation stage (D1) relayed by a brittle post-Pan-African deformation stage (D2). The first phase D1 consists of two episodes noted D1a and D1b: (1) the D1a episode was a ductile pan-African deformation stage with a strong coaxial component, which favoured the development of symmetric fabrics of foliation. The tectonic regime was characterized, first by a NW-SE (~N140°) trending pure-shear-dominated shortening episode, which prevailed between 617.9 ± 2.8 to 589 ± 1.9 Ma. Then during episode D1a, the shortening direction evolved gradually from NW-SE to ~E-W (N90°-N70°). This change of direction is due to the constraint coming from the Pan-African orogeny. The deformation had progressively a rotational component and this is how D1b episode began. This latter was characterized by a brittle-ductile deformation, associated with the formation of mylonitic gneiss and micaschist. So, the counter clockwise sinistral rotation of the shortening axis Z (from N140° to N90°- N70°) reveals a Pan-African continuum of deformation between D1a and D1b episode. (2). Subsequently, a stage of brittle deformation D2 affected all the previous structures. This D2 stage is marked by a continental-scale system of conjugated strike-slip faults, NE-SW and NW-SE trending. This investigation contribute to knowledge of Pan-African kinematic evolution of Benin-Nigerian Shield, particularly its northeastern part (South Maradi).
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