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Collision process in the “hot” conditions that correspond to the ancient Earth is accompanied by increased heat generation during subduction and largely depends on the lithosphere thickness. The style of the collision is the same for a subcontinental lithospheric mantle (SCLM) thickness of 65 to 125 km, the subduction terminates with slab break-off followed by the formation of a large igneous province in between the two continents. Collision of continents with a very thick SCLM did not leads to slab break-off.