What global tectonic event happened 40 million years ago

The major tectonic event that happened in 40 million years ago is the collision of Indian tectonic plate and Eurasian tectonic plate.

Explanation:

Approximately 40 million years ago, the Indian Plate collided with the Eurasia.

The collision is more complex and protracted than most people think as the result of this collision gave rise to the Himalayas and Mount Everest.

The collision of the Indian tectonic plate and the Eurasian tectonic plate is the major tectonic event which occurred 40 million years ago.

Explanation:

Tectonic events are events which are driven by the movement of tectonic plates. The tectonic plates are moved by convection currents of molten material on the earth's interior.

The collision of the Indian tectonic plate and the Eurasian tectonic plate is the major tectonic event which occurred 40 million years ago.

The Indian Plate is a major tectonic plate straddling the equator in the eastern hemisphere.

The collision with the Eurasian Plate along the boundary between India and Nepal formed the orogenic belt that created the Tibetan Plateau and the Himalaya Mountains, as sediment bunched up like earth before a plow.

The Indian Plate is currently moving north-east at five centimetres (2.0 in) per year, while the Eurasian Plate is moving north at only two centimetres (0.79 in) per year. This is causing the Eurasian Plate to deform, and the Indian Plate to compress at a rate of four millimetres (0.16 in) per year.