, having rifted from Gondwana shown drifting towards Eurasia, closing the Paleo-Tethys Ocean above, opening the Neo-Tethys Ocean below, and carrying parts of what is today the
Tibetan Plateau , the Kohistan-Ladakh
island arc, and the
Gangdese belt to Eurasia preceded the final India-Eurasia collision. The stars mark the
syntaxis-causing obtrustions. Before the
Indian plate rifted from
Gondwana and drifted northward toward Eurasia, two other landmasses, the
Qiangtang terrane and
Lhasa terrane, had accreted to Eurasia. The Qiantang and Lhasa terranes were part of the string of microcontinents
Cimmeria, today constituting parts of
Turkey,
Iran,
Pakistan (including the
Karakoram),
China,
Myanmar,
Thailand and
Malaysia, which closed the
Paleo-Tethys Ocean above them and opening the Neo-Tethys Ocean between them and Gondwana, eventually colliding with Eurasia, and creating the
Cimmerian Orogeny. After the Lhasa terrane had adjoined Eurasia, an active continental margin opened along its southern flank, below which the Neo-Tethys oceanic plate had begun to subduct.
Magmatic activity along this flank produced the
Gangdese batholith in what is today the
Tibetan trans-Himalaya. Another subduction zone opened to the west, in the ocean basin above the Kohistan-Ladakh
island arc. This island arc—formed by one oceanic plate subducting beneath another, its magma rising and creating continental crust—drifted north, closed its ocean basin and collided with Eurasia.
Ladakh is today in the Indian-administered region of
Kashmir and
Kohistan in the
Khyber-Pakhtunkhwa province of Pakistan, both on the Indian subcontinent. The collision of India with Eurasia closed the Neo-Tethys Ocean. The suture zone (in this instance, the remnants of the Neo-Tethys subduction zone pinched between the two continental crusts), which marks India's welding to Eurasia, is called the
Indus-Yarlung suture zone. It lies north of the Himalayas. The headwaters of the
Indus River and the
Yarlung Tsangpo (later in its course, the
Brahmaputra) flow along this suture zone. These two Eurasian rivers, whose courses were continually diverted by the rising Himalayas, define the western and eastern limits, respectively, of the Himalayan mountain range. == See also ==