Broken Ridge

The Broken Ridge once formed a large igneous province (LIP) together with the Kerguelen Plateau.

The sediment cover on the ridge reaches 800 m (2,600 ft) and the Moho is found at about 20 km (12 mi).

When they broke-up, the southern flank of Broken Ridge was uplifted some 2,000 m (6,600 ft) and reached above sea level.

In the Early Cretaceous, the Kerguelen hotspot was split into several diapirs of various sizes, composition, and ascent rates.

In the late Cretaceous, activity in the mantle slowed and the Kerguelen hotspot was reduced to a single plume which created the Ninety East Ridge.