Interplay of fragmentation, flow, mingling, and mixing in composite pseudotachylyte-ultracataclasite veins – an example from the Main Central Thrust (central Nepal)

Published: 17 November 2022| Version 2 | DOI: 10.17632/8tygkfnrr5.2


The study on the internal fabric of the pseudotachylyte has been less. No reports of the pseudotachylyte-ultracataclasite composite veins from the thrust sheet, Nepal Himalaya. The presence of a pseudotachylyte-ultracataclasite vein in the vicinity of the MCT reveals repeated processes of fragmentation, fluidization, injection, flow, and solidification. Pseudotachylyte-ultracataclasite formed at high-pressure low temperatures 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.


Tribhuvan University Institute of Science and Technology


Tectonics, Electron Microscopy, Metamorphic Petrology, Regional Metamorphism, Optical Petrography, Fractal Dimension Model