Discussion
Structurally, the Great Himalayas are ........................
Answer: D
The key is an autochthonous zone, and this is the key's reading rather than a settled fact.
Structural geologists divide the Himalaya by thrusts into the Siwalik, Lesser Himalaya, Great (Higher) Himalaya and Tethys zones. Rocks lying roughly where they formed are called autochthonous, rocks moved a short way para-autochthonous, and rocks carried far over others allochthonous. No source found labels the Great Himalaya autochthonous; descriptions of the Main Central Thrust speak of high-grade Greater Himalayan rocks lying over the lower-grade Lesser Himalayan rocks, which points the other way.
A suture zone is certainly wrong: the Indus-Tsangpo suture lies north of the Great Himalaya, where the Indian and Eurasian plates joined. The para-autochthonous label is the one usually attached to the Lesser Himalaya, in the south. Of the options, the key treats the Great Himalaya as the autochthonous core, so choose D.
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