extension often leads to the formation of oceanic crust and relatively short-lived spreading centres. As the asthenosphere behind the arc has been partly affected by volatiles from the downgoing slab, the typical back-arc basin basalts are intermediate in character between MORB type basalts and Island Arc Basalts (IAB) type basalts.

Intraplate

Magmatic activity away from plate boundaries forms an important part of the magmatism on earth, including the largest magmatic events known, Large Igneous Provinces.

Hotspots

1.Previous
3.Next