A theory of finite strain variation through contrasting layers, and its bearing on cleavage refraction
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2023, Journal of Structural GeologyBasic structural geology of Venus: A review of the gaps and how to bridge them
2023, Earth-Science ReviewsRefraction of micro-fractures due to shear-induced mechanical stratigraphy in a low-grade meta-sedimentary rock
2020, Journal of Structural GeologyCitation Excerpt :5, they address the following: (i) fracture propagation and geometry across the layers, (ii) compare models with the natural examples, thereby to comment on (iii) how far competency contrast amongst layers matter. Mineral contents primarily decide viscosity of the layers and hence the degree of cleavage refraction (e.g. Treagus, 1983). Ratio of effective viscosity between the quartz layer and the phyllitic layer usually is < 10 (Czeck et al., 2019).
Application of rheology gauge to determine rock competency in Taili, western Liaoning, NE China
2020, Journal of Structural GeologyCitation Excerpt :It is obvious that the aplite exhibits a near steady state in the coarse-grained granitic gneiss but refracts significantly across the contact boundary to the fine-grained porphyritic granitic gneiss (Fig. 2e). In Taili, granitic aplite associated with shear refraction cuts both coarse-grained granitic gneiss and fine-grained porphyritic granitic gneiss (Fig. 2h), indicating a higher viscosity for the coarse-grained granitic gneiss than for the fine-grained porphyritic granitic gneiss based on the strain refraction theory (Treagus, 1983). This viewpoint can also be corroborated by the shear deformation behavior of granitic aplite in coarse-grained granitic gneiss and fine-grained porphyritic granitic gneiss (Fig. 2e).
Opposite shear senses: Geneses, global occurrences, numerical simulations and a case study from the Indian western Himalaya
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2019, Journal of Structural Geology