<P> The Kerguelen Plateau (/ ˈkɜːrɡələn /, / kərˈɡeɪlən /) is an oceanic plateau and a large igneous province (LIP) in the southern Indian Ocean . It is also a microcontinent and submerged continent . It is about 3,000 km (1,900 mi) to the southwest of Australia and is nearly three times the size of Japan . The plateau extends for more than 2,200 km (1,400 mi) in a northwest--southeast direction and lies in deep water . </P> <P> The plateau was produced by the Kerguelen hotspot, starting with or following the breakup of Gondwana about 130 million years ago . A small portion of the plateau breaks sea level, forming the Kerguelen Islands (a French territory) plus the Heard and McDonald Islands (an Australian territory). Intermittent volcanism continues on the Heard and McDonald Islands . </P> <P> Symmetrically located across the Indian Ocean ridge and due west of Australia is the Broken Ridge underwater volcanic plateau, which at one time was contiguous with the Kerguelen Plateau prior to rifting by the mid-ocean ridge . </P>

When did the kerguelen plateaus start to form