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By Soumyajit Mukherjee

Study of microstructures is an quintessential element of figuring out structural geology of any terrain. a couple of ‘new’ microscopic buildings 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. besides the fact that, for the sake of brevity, microstructural papers can't convey all attainable version of their morphology. The proposed booklet goals to provide those constructions with beautiful color images. each one photomicrograph can have a complete caption. The e-book additionally provides grain boundary migration, boudins, signs of metamorphic retrogression, and the way popular shear feel 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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3d of Mukherjee (2011). Plane polarized light. Location Karakoram Shear Zone (India). Width of view 1 mm 1 Mineral Fish and Ductile Shear Senses 33 Fig. 63 A parallelogram-shaped garnet fish. Top-to-right shear. 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.

Reproduced from Mukherjee (2012a). Cross-polarized light. Location Zanskar Shear Zone (India). Width of view 2 mm Fig. 2 Top-to-right sense brittle faulted mica grain. The top fragment is trapezoid-shaped with gently curved margins. The brittle shear plane is marked by recrystallized micas. Reproduced from Fig. 7b of Mukherjee (2012b). Cross-polarized light. Location Higher Himalaya (Himachal Pradesh, India). 5 mm 2 Trapezoid-Shaped Minerals and Brittle Shear Senses 49 Fig. 3 Top-to-right brittle sheared micas.

Those are not to be considered as ‘flanking microstructures’. Shape asymmetry of parallelogram-shaped nucleated grains in flanking micro-structures from the western Himalayan shear zones indicates a top-to-S/SW ductile shear. The cross-cutting element viz. the parallelogram-shaped minerals are considered to have nucleated either prior or simultaneous to the regional top-to-S/ SW ductile shear. The shear senses indicated by these nucleations match with those indicated by mineral fish (see Mukherjee and Koyi 2009 for discussions).

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