The Alboran volcanic-arc modulated the Messinian faunal exchange and salinity crisis

Scientific Reports
Guillermo Booth-ReaIngo Grevemeyer

Abstract

What process triggered the Mediterranean Sea restriction remains debated since the discovery of the Messinian Salinity Crisis (MSC). Recent hypotheses infer that the MSC initiated after the closure of the Atlantic-Mediterranean Betic and Rifean corridors, being modulated through restriction at the Gibraltar Strait. These hypotheses however, do not integrate contemporaneous speciation patterns of the faunal exchange between Iberia and Africa and several geological features like the evaporite distribution. Exchange of terrestrial biota occurred before, during and after the MSC, and speciation models support an exchange path across the East Alborán basin (EAB) located a few hundreds of km east of the Gibraltar Strait. Yet, a structure explaining jointly geological and biological observations has remained undiscovered. We present new seismic data showing the velocity structure of a well-differentiated 14-17-km thick volcanic arc in the EAB. Isostatic considerations support that the arc-crust buoyancy created an archipelago leading to a filter bridge across the EAB. Sub-aerial erosional unconformities and onlap relationships support that the arc was active between ~10-6 Ma. Progressive arc build-up leading to an archipelago and its ...Continue Reading

References

Apr 11, 2003·Nature·Svend DuggenJason Phipps Morgan
Dec 17, 2009·Nature·D Garcia-CastellanosR De Vicente
Oct 31, 2017·Nature Geoscience·Pietro SternaiSébastien Castelltort

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Citations

Jul 4, 2020·Scientific Reports·Eduardo José Rodríguez-RodríguezPedro Aragón
Jun 3, 2021·Scientific Reports·Dan Valentin PalcuWout Krijgsman

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