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Microstructural constraints on the Pan-African syn-kinematic magmatism in the Adamawa-Yade domain, Cameroon.
- Source :
- Arabian Journal of Geosciences; Oct2023, Vol. 16 Issue 10, p1-25, 25p
- Publication Year :
- 2023
-
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<subscript>n</subscript>, D<subscript>n+1</subscript>, and D<subscript>n+2</subscript>, which can be correlated with regional D<subscript>1</subscript> to D<subscript>4</subscript> deformation phases of the CAFB. The D<subscript>n</subscript> (ca. 660–600 Ma) marks the crystallization phase accompanied by magmatic and sub-magmatic microstructures. It is related to the regional D<subscript>1</subscript>-D<subscript>2</subscript> deformation. The D<subscript>n+1</subscript> (ca. 600 Ma) represents a compressive tectonic setting related to the regional D<subscript>3</subscript>. The D<subscript>n+2</subscript> (ca. 598 Ma), initiated during D<subscript>3</subscript>, represents a transpressive tectonic combined with brittle deformation, and marked by sinistral and dextral shearings episodes, grading into the regional D<subscript>4</subscript> 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]
Details
- Language :
- English
- ISSN :
- 18667511
- Volume :
- 16
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Arabian Journal of Geosciences
- Publication Type :
- Academic Journal
- Accession number :
- 173106188
- Full Text :
- https://doi.org/10.1007/s12517-023-11667-9