TY - JOUR AU - Aerden, D. AU - Aldaher, S. AU - Bouybaouene, M. AU - Sayab, M. PY - 2011/09/06 Y2 - 2024/03/28 TI - Microstructural map of a thin-section scale fold pair; implications for folding mechanism in a fine-grained garnet JF - Trabajos de GeologĂ­a JA - Trab. geol. VL - 29 IS - 29 SE - International Meeting of Young Researchers in Structural Geology and Tectonics (Part 1) DO - UR - https://reunido.uniovi.es/index.php/TDG/article/view/270 SP - AB - 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. ER -