By Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier, Dirk J. Wiersma (auth.)
Mylonites shape in line with excessive charges of pressure inside of deep ductile shear zones, that are the extensions at intensity of floor faults, thrusts and fault breccias. they could have many various mineralogical compositions and are for this reason outlined via their textural visual appeal. This atlas presents excessive definition photographs of a big variety of varied mylonites permitting scholars and geologists to properly classify them with better ease. It additionally deals insights into the translation of mylonitic materials to reply to questions corresponding to: from what kind of rock did this mylonite derive? what have been the metamorphic conditions in the course of mylonitization? what was once the depth of deformation? and what was once the experience of shear?
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Additional info for Atlas of Mylonites- and related microstructures
25, showing the flow structure in the embayment of the pseudotachylyte vein. Width of view 3 mm. PPL. Fig. 28 Pseudotachylyte vein in protomylonitic to cataclastic granitic host rock. Note the injection vein intruding downwards from the lower contact. Many inclusions are relatively angular. A vague flow structure is visible in the vein suggesting flow from left to right. Leiden collection. Width of view 25 mm. PPL. 43 Pseudotachylytes Fig. 29 As Fig. 28. Width of view 25 mm. CPL. Chapter 4 | Low-Grade Mylonites 4 Low-Grade Mylonites The temperature range for these mylonites is thought to be roughly between 250 and 500 °C.
The K-feldspar (above center) is broken into a dozen slices dislocated in an en- echelon pattern. They show minor crystalplastic deformation. The lower part of the photomicrograph is mainly composed of one large quartz grain with strong undulose extinction, indicating considerable crystalplastic deformation and minor recrystallisation into very small new grains, along high strain zones that nucleate from intracrystalline faults in the feldspar. Width of view 4 mm. CPL. Low-Grade Mylonites Fig. 5 Low-grade mylonite derived from granite.
53 Low-Grade Mylonites Fig. 11 Detail of Fig. 10, showing incipient recrystallisation by bulging in the quartz vein above the center. The lobate contacts of the deformed quartz grains define an oblique foliation consistent with dextral shear sense. Width of view 3 mm. CPL. Fig. 12 Mylonite derived from paragneiss with garnet, kyanite, biotite and K-feldspar. Note the strong deviation of the mylonitic foliation around the garnet porphyroblast at right. The yellow grains in Fig. 13 are kyanite crystals.