First report of composite pseudotachylyte-ultracataclasite veins at the Main Central Thrust (central Nepal): formation conditions, fabrics, and fabric forming process

Published: 23 March 2022| Version 1 | DOI: 10.17632/8tygkfnrr5.1


Research on the internal fabric of the pseudotachylyte has been less. No reports of the pseudotachylyte and ultracataclasite composite veins from the thrust sheet, Nepal Himalaya. The presence of pseudotachylyte-ultracataclasite vein at the vicinity of the MCT reveals repeated processes of fragmentation, fluidization, injection, flow, and solidification. Pseudotachylyte-ultracataclasite formed at high pressure low temperature probably during the Late Miocene to Early Pliocene, younger than 7.5 Ma


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Analyzed with the help of electron Microscopy. The frequency distribution of fragments was quantified by fractal geometry methods. Particle sizes and distribution were determined with the help of the open-source program Image J.


Geochemistry, Petrology, Tectonics, Electron Microscopy, Optical Petrography, Fractal Dimension Model