Mega-flood in Mediterranean Sea region - ‘Messinian Salinity Crisis’

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First direct proof of mega-flood in Mediterranean Sea region - ‘Messinian Salinity Crisis’

First direct proof of mega-flood in Mediterranean Sea region - on www.uu.nl

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First direct proof of mega-flood in Mediterranean Sea region

24 March 2023

Geologists from Utrecht, London and Granada have found the first direct proof of the largest known mega-flood that ever occurred on earth. This mega-flood ended what is known as the ‘Messinian Salinity Crisis’, a period around six million years ago when the water level in the Mediterranean Sea sank by around 1.5 km, causing an extreme environmental crisis in the region. The authors studied sandstone that was exposed along the southern coast of Sicily and concluded that it was formed by a powerful flow from the western Mediterranean Sea towards the east. The water flowed over a barrier that separated what were then isolated basins in the western and eastern Mediterranean region. Their research was recently published in the journal Sedimentology.

The waters of the Mediterranean Sea and the Atlantic Ocean flow back and forth and mix via the narrow Straits of Gibraltar. During the Messinian era, around six million years ago, this flow was disrupted by a tectonic closure of the straits. As a result, much of the Mediterranean Sea evaporated faster than rivers could supply more water. A kilometre-thick layer of evaporite (gypsum and salt) gradually formed over the entire Mediterranean Sea basin. At the beginning of the Zanclean, around 5.33 million years ago, the Mediterranean filled once again to today’s current level when the connection with the Atlantic Ocean was restored. Models indicate that this was due to an enormous flood entering the Mediterranean basin via Gibraltar. However, until recently there was no geologic proof of such a mega-flood in the geological record of the Mediterranean Sea region.

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MORE: https://www.uu.nl/en/news/first-direct-proof-of-mega-flood-in-mediterranean-sea-region

Edited April 22, 2023 by msfntor
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