1. Microstructural constraints on the Pan-African syn-kinematic magmatism in the Adamawa-Yade domain, Cameroon.
- Author
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Yomeun, Bovari Syprien, Wang, Wei, Tchouankoue, Jean Pierre, Kamani, Michele Sandra Kamguia, Ndonfack, Kevin Igor Azeuda, and Basua, Emmanuel Archelaus Afanga
- Subjects
RECRYSTALLIZATION (Geology) ,OROGENIC belts ,IGNEOUS rocks ,METAMORPHIC rocks ,OROGENY ,ROCK deformation ,MAGMATISM - Abstract
Linte region, located within the Adamawa-Yade domain of the Central African Fold Belt (CAFB), is associated with the Pan-African orogeny in Cameroon. Magmatic (granular texture and suborientation of euhedral to subhedral feldspar crystals), sub-magmatic (intragranular fractures filled with quartz), and mostly solid-state (internal deformation, exsolution, and dynamic and static recrystallization) microstructures indicate that magmatic and metamorphic rocks of the Linte area were subjected to analogous tectonic manifestations during the Pan-African orogeny. Magmatic, sub-magmatic, and solid-state microstructural analyses combined with the existing age record reveal three phases of local deformation, namely D
n , Dn+1 , and Dn+2 , which can be correlated with regional D1 to D4 deformation phases of the CAFB. The Dn (ca. 660–600 Ma) marks the crystallization phase accompanied by magmatic and sub-magmatic microstructures. It is related to the regional D1 -D2 deformation. The Dn+1 (ca. 600 Ma) represents a compressive tectonic setting related to the regional D3 . The Dn+2 (ca. 598 Ma), initiated during D3 , represents a transpressive tectonic combined with brittle deformation, and marked by sinistral and dextral shearings episodes, grading into the regional D4 stage. Collectively, microstructures recorded in the Linte igneous rocks can be correlated with the regional tectonic events, including crustal thickening, and successively sinistral wrench and regional dextral shear movements during the Pan-African orogeny in Cameroon. [ABSTRACT FROM AUTHOR]- Published
- 2023
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