By Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier, Dirk J. Wiersma (auth.)
Mylonites shape in accordance 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 via their textural visual appeal. This atlas offers excessive definition photos of a big variety of assorted mylonites permitting scholars and geologists to properly classify them with higher ease. It additionally bargains insights into the translation of mylonitic materials to reply to questions akin to: from what form of rock did this mylonite derive? what have been the metamorphic conditions in the course of mylonitization? what used to be the depth of deformation? and what used to be the feel of shear?
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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. Note that the quartz grains below the garnet were protected from deformation, probably by extension of the garnet below or above the thin section (in 3D). No sense of shear is apparent in this view. Marsfjällen, Västerbotten, Sweden. Width of view 16 mm.
Width of view 4 mm. PPL. 38 Fig. 19 Pseudotachylyte (black domain in the upper part) veins in a host rock of mylonite derived from a felsic granulite. The porphyroclasts in the mylonite are composed of feldspar and orthopyroxene. The matrix is rich in biotite. Elongated inclusions in the pseudotachylyte are the result of minor ductile deformation after the solidification of the pseudotachylyte. Note the irregular shape of the pseudotachylyte vein and some isolated patches (right of the center) that may be linked to the main pseudotachylyte body in the third dimension.
The yellow grains in Fig. 13 are kyanite crystals. Note that the quartz grains below the garnet were protected from deformation, probably by extension of the garnet below or above the thin section (in 3D). No sense of shear is apparent in this view. Marsfjällen, Västerbotten, Sweden. Width of view 16 mm. PPL. 54 Chapter 4 Fig. 13 As Fig. 12. Width of view 16 mm. CPL. 55 Low-Grade Mylonites Fig. 14 Detail of Fig. 13 to show deformed quartz with undulose extinction and lobate contacts. Note incipient recrystalisation by bulging, indicative of low-grade metamorphic conditions during mylonitisation.
Atlas of Mylonites- and related microstructures by Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier, Dirk J. Wiersma (auth.)