Africa’s major discovery of new 300-mile ocean as continent splits | Science | News

A massive new ocean spanning hundreds of kilometers could one day split Africa in two, scientists have warned after discovering that the continent was already breaking apart deep under the surface. New research focusing on the Turkana Rift in East Africa suggests that the process that led to the continent’s breakup was much more advanced than previously believed; As tectonic forces continue to pull the land apart, it raises the possibility that a 300-mile-long ocean basin could eventually form.

The study, published in Nature Communications, found that the crust beneath the region has thinned significantly; This is an important signal that the rifts are approaching a critical stage in continental separation. Christian Rowan, lead author of the study, said: “We found that rifting in this region is more advanced than anyone expected and the crust is thinner. East Africa has made more progress in the rifting process than previously thought.”

The Turkana Rift, which covers parts of Kenya and Ethiopia, forms part of the broader East African Rift System, a geological fault line that stretches thousands of kilometers from the Red Sea to Mozambique. Here, the African continent is slowly separating as the Somali Plate moves away from the rest of Africa at a rate of about 4.7 millimeters per year.

Using seismic imaging and subsurface data collected in collaboration with the Turkana Basin Institute, scientists mapped the structure of the crust beneath the rift.

They found that at its center the crust was only 13 kilometers thick; this is less than half the thickness measured outside the rift zone. This extreme thinning is the hallmark of a process known as “necking,” in which the crust is stretched and weakened until it eventually breaks apart.

Mr Rowan explained: “The thinner the crust, the weaker it is, which helps the splitting continue.”

Researchers now believe the region has reached a turning point. Anne Bécel, a co-author of the study, said: “We have reached this critical threshold. We think this is why they are more likely to leave.”

While the dramatic breakup won’t happen anytime soon (it will likely take millions of years), the long-term consequences are profound. Eventually the molten rock will rise to the surface and form new ocean crust. Water from the Indian Ocean could fill this gap, creating a new sea and effectively splitting the continent.

Scientists say the findings not only reshape the understanding of how continents break up, but also shed new light on one of the most important regions in human history.

The Turkana Rift is often described as the “cradle of humanity” as it has produced more than 1,200 hominin fossils; this is about a third of all such discoveries in Africa.

But new research suggests that its importance may lie less in evolution itself and more in conservation.

“Conditions were suitable for the preservation of a continuous fossil record,” Mr Rowan said, pointing to the accumulation of fine sediments following volcanic activity millions of years ago.

Its implications extend beyond geology. By relating tectonic shifts to changes in climate and landscape, scientists hope to better understand how environmental forces shaped early human development and how similar forces may affect the planet’s future.

“In fact, we now have a front-row seat to observe a critical rifting phase,” said co-author Folarin Kolawole, describing the rare opportunity to witness the birth of a new ocean in real time, albeit on a geological clock.