Discussion
The major lithotectonic units in the Himalaya are bounded by thrust. Arrange correctly the thrust/fault system from north to south in this context.
(a) MCT
(b) Tethian Fault
(c) MBT
(d) HFT
Answer: A
From north to south the order is (b) Tethian Fault, (a) MCT, (c) MBT, (d) HFT.
The Himalaya is divided into belts separated by north-dipping faults, younger and active towards the south:
- Tethyan (South Tibetan Detachment) fault: between the Tethyan sediments and the Higher Himalayan crystallines.
- Main Central Thrust: between the Higher Himalaya and the Lesser Himalaya.
- Main Boundary Thrust: between the Lesser Himalaya and the Siwaliks.
- Himalayan Frontal Thrust: between the Siwaliks and the Indo-Gangetic plain.
The other orders put the MCT or the MBT north of the Tethyan fault, or the HFT first, reversing the sequence.
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