[ad_1]
KAUST researchers found that the Purple Sea skilled an enormous disruption 6.2 million years in the past, fully remodeling its marine life.
Researchers at King Abdullah College of Science and Expertise (KAUST) have confirmed that the Purple Sea as soon as fully dried up round 6.2 million years in the past, solely to be all of the sudden refilled by a catastrophic inflow of water from the Indian Ocean. Their work locations a exact timeline on a outstanding occasion that reshaped the basin’s historical past.
By combining seismic imaging, microfossil evaluation, and geochemical courting, the staff found that this transformation occurred inside simply 100,000 years, an exceptionally quick span in geological phrases. Throughout this era, the Purple Sea shifted from being linked to the Mediterranean to turning into a desolate salt basin. The dry section ended when a strong flood minimize via volcanic ridges, opening the Bab el-Mandab strait and restoring the Purple Sea’s connection to the worldwide oceans.
“Our findings present that the Purple Sea basin data one of the crucial excessive environmental occasions on Earth, when it dried out fully and was then all of the sudden reflooded about 6.2 million years in the past,” mentioned lead writer Dr. Tihana Pensa of KAUST. “The flood reworked the basin, restored marine situations, and established the Purple Sea’s lasting connection to the Indian Ocean.”
How the Indian Ocean Flooded the Purple Sea
The Purple Sea was initially linked from the north to the Mediterranean via a shallow sill. This connection was severed, drying the Purple Sea right into a barren salt desert. Within the south of the Purple Sea, close to the Hanish Islands, a volcanic ridge separates the ocean from the Indian Ocean. However round 6.2 million years in the past, seawater from the Indian Ocean surged throughout this barrier in a catastrophic flood. The torrent carved a 320-kilometer-long submarine canyon that’s nonetheless seen as we speak on the seafloor. The flood quickly refilled the basin, drowning the salt flats and restoring regular marine situations in lower than 100,000 years. This occasion occurred practically one million years earlier than the Mediterranean was refilled by the well-known Zanclean flood, giving the Purple Sea a singular story of rebirth.
Why the Purple Sea Issues Geologically
The Purple Sea shaped by the separation of the Arabian Plate from the African Plate starting 30 million years in the past. Initially, the ocean was a slim rift valley crammed with lakes, then turned a wider gulf when it was flooded from the Mediterranean 23 million years in the past. Marine life thrived initially, as seen by the fossil reefs alongside the northern coast close to Duba and Umlujj. Nonetheless, evaporation and poor seawater circulation elevated salinity, inflicting the extinction of marine life between 15 and 6 million years in the past. Moreover, the basin was crammed with layers of salt and gypsum. This culminated within the full desiccation of the Purple Sea. The catastrophic flood from the Indian Ocean restored marine life within the Purple, which persists within the coral reefs to the current.
All in all, the Purple Sea is a pure laboratory for understanding how oceans are born, how salt giants accumulate, and the way local weather and tectonics work together over thousands and thousands of years. The invention highlights how carefully the Purple Sea’s historical past is linked with international ocean change. It additionally reveals that the area has skilled environmental extremes earlier than, solely to return as a thriving marine ecosystem.
“This paper provides to our data in regards to the processes that kind and broaden oceans on Earth. It additionally maintains KAUST’s main place in Purple Sea analysis,” mentioned co-author KAUST Professor Abdulkader Al Afifi.
Reference: “Desiccation of the Purple Sea basin initially of the Messinian salinity disaster was adopted by main erosion and reflooding from the Indian Ocean” by Tihana Pensa, Antonio Delgado Huertas and Abdulkader M. Afifi, 9 August 2025, Communications Earth & Surroundings.
DOI: 10.1038/s43247-025-02642-1
By no means miss a breakthrough: Be a part of the SciTechDaily e-newsletter.
Comply with us on Google, Uncover, and Information.
[ad_2]
