Volcanoes in the Alps and Himalayas and the subduction of Tethys Sea?

Question

Geologist have theorized that the Tethys Sea subducted under Eurasian plates. But where are the volcanoes that would have resulted due to this? Where are the volcanoes in the Alps and the Himalayas?

Answer 1

Let me start by saying it is hypothesized not theorized. The hypothesis is due to the Himalayas being the result of Continent-Continent collision and not and oceanic/continent collision for the most part. So there is not as much underthrusting of material as one would find around the Pacific Plate which is subducting below continental materials.