Southwest Indian Ridge
The Southwest Indian Ridge (SWIR) is a divergent tectonic plate boundary located along the floor of the southwest Indian Ocean. It separates the African Plate to the north from the Antarctic Plate to the south.
The SWIR extends between the Rodrigues Triple Point in the southern Indian Ocean to the Bouvet Triple Junction in the south Atlantic. It formed shortly after the breakup of Gondwana during the Mesozoic Era The SWIR is classified as an ultraslow spreading ridge with a current spreading rate of around 8 mm/yr, making it the second slowest in the world after the Gakkel Ridge. As with other slow spreading ridges, magma supply along the ridge is often low or intermittent, leading to the formation of oceanic core complexes that expose lower crustal plutonic rocks through tectonic unroofing along low-angle detachment faults.
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