In the Himalayan-Tibetan plateau, both normal and thrust faults are observed. Geological age dating suggests thrust faults are older (before 18-20 Ma) than the normal faults (after 18-20 Ma). Explain this observation.
Why is this the case? I'm unable to explain this using whatever I have learned so far. I am a beginner in the field of Earth Sciences, and I would appreciate a detailed answer (or any helpful pointers) so I can better understand these concepts!
P.S. I'm also new to this website, so pardon me if my question isn't in line with any of the guidelines. Let me know how I can improve it.