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

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.

对于伪脆性岩的内部结构研究相对较少。关于尼泊尔喜马拉雅山脉推覆岩片中的伪脆性岩-超脆性碎裂岩复合脉的报告尚无。在MCT附近发现伪脆性岩-超脆性碎裂岩脉的存在，揭示了重复的破碎、流体化、注入、流动和凝固过程。伪脆性岩-超脆性碎裂岩的形成可能发生在高压力低温度条件下，时间约在晚中新世至早更新世期间，距今约小于750万年。