Geologists have discovered that the African continent is splitting apart faster than previously thought. The East African Rift System, specifically the Turkana Rift Zone in Kenya, has reached a critical threshold known as 'necking,' where the crust has thinned to about 13 kilometers-less than half the thickness of surrounding regions.
Christian Rowan, a geoscientist at Columbia University, says, "We found that rifting in this zone is more advanced, and the crust is thinner, than anyone had recognized." Once the crust thins below 15 kilometers, a continental breakup is inevitable. In a few million years, the region will enter 'oceanization,' where magma erupts to form a new seafloor, and the Indian Ocean rushes in.
This geological process has a fascinating link to human history. The Turkana Rift Zone is rich in early hominin fossils. The researchers suggest that the thinning crust led to increased sedimentation around 4 million years ago, creating ideal conditions for fossil preservation. This may explain why the area is such a treasure trove for paleoanthropologists.
The findings were published in Nature Communications.