Mylonitic Texture

Mylonites are rocks that have undergone modification of original textures by predominantly plastic flow due to dynamic recystallization. The formation of mylonites occur at depth, below brittle faults, in continental and oceanic crust. Microstructures that form during mylonitization vary according to original mineralogy and modal compositions, temperatures, confining pressure, strain rate, applied stresses, and the presence or absence of fluids. Mylonites are foliated rock with strong lineation resulting from shear in a ductile fault shear zone.

Bibliography

• Bucher, K., & Grapes, R. (2011). Petrogenesis of metamorphic rocks. Springer Science & Business Media.
• Fossen, H. (2016). Structural geology. Cambridge University Press.
• Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman.
• Passchier, Cees W., Trouw, Rudolph A. J: Microtectonics (2005).
• Philpotts, A., & Ague, J. (2009). Principles of igneous and metamorphic petrology. Cambridge University Press.
• Shelley, D. (1993). Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations.
• Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology. Cambridge University Press.
• Vernon, R. H. (2018). A practical guide to rock microstructure. Cambridge university press.

Photo
Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). XPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)
Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). XPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). XPL image, 2x (Field of view = 7mm)
Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). XPL image, 2x (Field of view = 7mm)
Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). XPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts in a mylonite from Bhutan (Himalaya). PPL image, 2x (Field of view = 7mm)
Quartz and mica rich layers in a mylonite. PPL image, 2x (Field of view = 7mm)	Quartz and mica rich layers in a mylonite. XPL image, 2x (Field of view = 7mm)	Quartz and mica rich layers in a mylonite. PPL image, 2x (Field of view = 7mm)
Quartz and mica rich layers in a mylonite. PPL image, 2x (Field of view = 7mm)	Quartz and mica rich layers in a mylonite. XPL image, 2x (Field of view = 7mm)	Quartz-feldspar and mica rich layers in a mylonite. PPL image, 2x (Field of view = 7mm)
Quartz-feldspar and mica rich layers in a mylonite. XPL image, 2x (Field of view = 7mm)	Quartz-feldspar and mica rich layers in a mylonite. PPL image, 2x (Field of view = 7mm)	Quartz-feldspar and mica rich layers in a mylonite. XPL image, 2x (Field of view = 7mm)
Feldspar porphyroclasts and quartz robbons in a granitic Mylonite. PPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts and quartz robbons in a granitic Mylonite. XPL image, 2x (Field of view = 7mm)	Feldspar porphyroclasts and quartz robbons in a granitic Mylonite. PPL image, 2x (Field of view = 7mm)