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Magmatic pulse driven by sea-level changes associated with the Messinian salinity crisis

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Sternai Pietro Caricchi L Garcia-Castellanos D Jolivet L Sheldrake T Castelltort S,
Project Linking deep Earth and surface dynamics: the effects of erosion on magma productivity
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Original article (peer-reviewed)

Journal Nature Geoscience
Page(s) 1 - 5
Title of proceedings Nature Geoscience
DOI 10.1038/ngeo3032

Open Access

URL https://www.nature.com/articles/ngeo3032
Type of Open Access Website

Abstract

Between 5 and 6 million years ago, during the so-called Messinian salinity crisis, the Mediterranean basin became a giant salt repository. The possibility of abrupt and kilometre-scale sea-level changes during this extreme event is debated. Messinian evaporites could signify either deep- or shallow-marine deposits, and ubiquitous erosional surfaces could indicate either subaerial or submarine features. Significant and fast reductions in sea level unload the lithosphere, which can increase the production and eruption of magma. Here we calculate variations in surface load associated with the Messinian salinity crisis and compile the available time constraints for pan-Mediterranean magmatism. We show that scenarios involving a kilometre- scale drawdown of sea level imply a phase of net overall lithospheric unloading at a time that appears synchronous with a magmatic pulse from the pan-Mediterranean igneous provinces. We verify the viability of a mechanistic link between unloading and magmatism using numerical modelling of decompression partial mantle melting and dyke formation in response to surface load variations. We conclude that the Mediterranean magmatic record provides an independent validation of the controversial kilometre-scale evaporative drawdown and sheds new light on the sensitivity of magmatic systems to the surface forcing.
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