Atlas of Mylonites- and related microstructures by Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier,

By Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier, Dirk J. Wiersma (auth.)

    1. Mylonites shape in keeping with excessive charges of pressure inside 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 hence outlined by means of their textural visual appeal. This atlas offers excessive definition photos of a giant variety of varied mylonites permitting scholars and geologists to properly classify them with higher ease. It additionally deals insights into the translation of mylonitic materials to reply to questions equivalent to: from what form of rock did this mylonite derive? what have been the metamorphic situations in the course of mylonitization? what used to be the depth of deformation? and what was once the feel of shear?

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CPL. 64 Fig. 29 Low-grade mylonite derived from granite. Porphyroclasts are composed of feldspar. The matrix contains fine-grained biotite and quartz. Sense of shear is sinistral as can be deduced from stair stepping to the left across the porphyroclasts. Deflection of the mylonitic foliation around the porphyroclasts (Fig. 30) causes the false impression of a late crenulation with upper left – lower right trending axial plane. Another trace of the axial planes of incipient extensional crenulation, trending upper right – lower left (visible in the upper ultramylonite band) is interpreted as related to C´ shear bands.

PPL. 58 Chapter 4 Fig. 19 As Fig. 18. Width of view 16 mm. CPL. 59 Low-Grade Mylonites Fig. 20 Detail of Fig. 19, showing a strongly deformed porphyroclast of plagioclase with accentuated undulose extinction and minor recrystallisation to a very fine-grained aggregate of new grains, especially along the upper contact. Dextral sense of shear is indicated by the stair stepping from left to right across the porphyroclast. Quartz (upper right part) is strongly deformed with only minor recrystallisation, pointing to low temperature conditions.

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. There is a gradual transition between cataclasites and low-grade mylonites. Whereas many feldspar porphyroclasts in low-grade mylonites still show fracturing by cataclasis, the quartz is usually deformed by crystal-plastic processes as shown by its change in shape and by undulose extinction. At increasing temperature bulging recrystallisation starts to manifest itself along the lobate contacts and eventually recrystallisation by subgrain rotation takes over (Chapter 10).

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