By Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier, Dirk J. Wiersma (auth.)
Mylonites shape based on excessive premiums 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 for this reason outlined by means of their textural visual appeal. This atlas offers excessive definition photos of a giant variety of diversified mylonites permitting scholars and geologists to properly classify them with higher ease. It additionally bargains insights into the translation of mylonitic materials to respond to questions similar to: from what form of rock did this mylonite derive? what have been the metamorphic situations in the course of mylonitization? what was once the depth of deformation? and what was once the feel of shear?
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Additional resources for Atlas of Mylonites- and related microstructures
CPL. Fig. 21 Pseudotachylyte vein (black, lower left to upper right) with relatively large and abundant inclusions of host rock. The host rock is a low-grade mylonite rich in biotite and garnet below the vein, with few orthopyroxene porphyroclasts, and rich in quartz and feldspar above the pseudotachylyte vein. All large grey crystals in the upper part, with undulose extinction, are feldspars. Mount West, Western Australia. Width of view 22 mm. CPL. 39 Pseudotachylytes Fig. 22 Detail of Fig. 21, showing flow structure in the pseudotachylyte.
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. A minor fault with apparent sinistral oﬀset is present left of the center. No general sense of shear can be deduced from this photomicrograph.
32 Chapter 3 Fig. 10 Detail of pseudotachylyte vein showing typical lobate and circular “devitrification” structures around gas bubbles in a fine-grained matrix. The gas bubbles are now filled with opaque material and carbonate. Leiden collection. 5 mm. PPL. Fig. 11 Pseudotachylyte vein (black) in a host rock of cataclastic protomylonitic granite. The pseudotachylyte vein has sharp contacts with cataclasite in the center and along the lower contact. The cataclasite was probaly the precursor rock from which the pseudotachylyte formed.
Atlas of Mylonites- and related microstructures by Prof. Dr. Rudolph A. J. Trouw, Prof. Dr. Cees W. Passchier, Dirk J. Wiersma (auth.)