Microstructural map of a thin-section scale fold pair; implications for folding mechanism in a fine-grained garnet
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Cómo citar

Aerden, D., Aldaher, S., Bouybaouene, M., & Sayab, M. (2011). Microstructural map of a thin-section scale fold pair; implications for folding mechanism in a fine-grained garnet. TRABAJOS DE GEOLOGÍA, 29(29). Recuperado a partir de https://reunido.uniovi.es/index.php/TDG/article/view/270

Resumen

Detailed microstructural mapping of thin section-scale folds in a garnet bearing micaschist sample from the RIF Mountains (Morocco), including analysis of inclusion trails in 62 small garnets, reveals interesting details about the folding mechanism. A number of classic fold mechanisms capable of producing axial-plane cleavage are reviewed and shown to insufficiently explain the mapped microstructural patterns including cleavage fanning, wedge-shaped microlithons, and detailed crenulation geometries associated with different stages of compositional differentiation (S2). A new model is proposed in which crenulation cleavage evolves from initial conjugate kink bands to sets of closely spaced micro-shear zones with major shortening components.
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