By Soumyajit Mukherjee
Study of microstructures is an essential component to figuring out structural geology of any terrain. a few ‘new’ microscopic constructions reminiscent of ‘flanking microstructures’, trapezoid-shaped mineral grains, reversal of ductile shear experience, micro-duplexes, V-pull aparts, and new minerals nucleating inside of host minerals have lately been defined in person manuscripts. notwithstanding, for the sake of brevity, microstructural papers can't exhibit all attainable edition of their morphology. The proposed ebook goals to offer those buildings with appealing color pictures. every one photomicrograph could have a entire caption. The publication additionally provides grain boundary migration, boudins, indicators of metamorphic retrogression, and the way popular shear experience signs (S-C materials, mineral fish etc.) fluctuate in morphology in serial-sections. the objective viewers is for graduate and postgraduate geosciences scholars and researchers of structural geology.
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Additional resources for Deformation Microstructures in Rocks
Reproduced from Fig. 9c of Mukherjee and Koyi (2012a). Location Zanskar Shear Zone (India). 5 mm Fig. 4 Top-to-right-up brittle sheared muscovite layers. Muscovite grains folded and crushed at right. Same as Fig. 10c of Mukherjee (2012b) but at a different orientation of the stage. Crosspolarized light. Location Zanskar Shear Zone (India). 5 mm 50 2 Trapezoid-Shaped Minerals and Brittle Shear Senses Fig. 5 Sheared mica layers. Top-to-right sense. Sigmoid grain boundaries near the left margin and in the central portion.
Nearly straight inclusion pattern sympathetic to shear sense. Isolated mica grains overall define S-fabrics and show the same shear sense. Reproduced from Fig. 8c of Mukherjee (2011). Plane polarized light. Location Karakoram Shear Zone (India). Width of view 5 mm Fig. 64 A nearly symmetric lenticular mica fish with irregular margin. The shape does not reveal shear sense. Can inclination of the cleavages with respect to the primary shear C-plane be used as shear sense indicator reliably?. Here the C-plane is oriented horizontal as deciphered from outside the field of view.
49 A sigmoid-shaped garnet fish. Inclusion patterns parallel the relict garnet morphology. Top-to-left-down synthetic secondary shear. Reproduced from Fig. 10b of Mukherjee (2010a). Plane polarized light. Location Higher Himalaya, at Karcham (Himachal Pradesh, India). 5 mm Fig. 50 A lenticular garnet fish with poorly oriented inclusions. No clear cut shear sense displayed. Biotite grains within the matrix also do not reveal shear sense. Plane polarized light. Location Shyok Suture Zone (India).
Deformation Microstructures in Rocks by Soumyajit Mukherjee