Scientists at King Abdullah University have uncovered that the Red Sea completely dried up around 6.2 million years ago, only to be refilled by a sudden flood from the Indian Ocean. This event marked a significant change in the region’s geology.
Using seismic imaging and tiny fossils, they found that this dramatic transformation happened in a brief period—about 100,000 years. The Red Sea, which used to connect to the Mediterranean, became a barren, salty basin. Then, a rush of seawater broke through volcanic barriers, reconnecting the Red Sea to the world’s oceans.
Lead researcher Dr. Tihana Pensa stated, “The Red Sea basin tells the story of an extreme environmental event, where it dried out completely and then was rapidly reflooded.” This flooding not only restored marine conditions but also solidified the Red Sea’s link to the Indian Ocean.
How the Flood Occurred
Initially, the Red Sea was connected to the Mediterranean through a shallow area. But over time, this connection was lost, leading to a dry and desolate landscape. About 6.2 million years ago, seawater from the Indian Ocean surged through a barrier near the Hanish Islands. This flood carved a vast underwater canyon and refilled the sea in less than 100,000 years, long before a similar event in the Mediterranean.
Why the Red Sea Matters
The Red Sea formed due to the separation of the Arabian and African plates about 30 million years ago. Over time, it evolved from a narrow rift filled with lakes to a wider gulf. Initially, marine life thrived here, as reflected in fossils found near Duba and Umlujj.
However, rising salinity caused many marine species to go extinct between 15 and 6 million years ago, leading to the area’s complete desiccation. The influx of Indian Ocean water later brought marine life back, establishing vibrant coral reefs that continue to flourish today.
The Red Sea serves as a natural laboratory, offering insights into ocean formation, salt accumulation, and the interplay between climate and tectonics. The recent discoveries contribute to our understanding of how oceans transform over time, an essential aspect of global environmental change.
Professor Abdulkader Al Afifi from KAUST emphasized that this research strengthens their position in Red Sea studies while enhancing our grasp of oceanic processes.
For those interested in the scientific details, the full findings are published in Communications Earth & Environment. You can access the study here.
Recent research like this shows not only the Red Sea’s unique geological story but also how past extreme conditions can lead to thriving ecosystems. The fluctuating nature of our planet serves as a reminder of resilience—both in nature and science.
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