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Title

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

AuthorsSternai, P.; Caricchi, L.; García-Castellanos, Daniel ; Jolivet, Laurent; Sheldrake, T. E.; Castelltort, S.
KeywordsMantle flow
Extension
Arc
Subduction
Lithosphere
Constraints
Evolution
Migration
Volcanism
Pressure
Issue DateOct-2017
PublisherNature Publishing Group
CitationNature Geoscience,10(10): 783-789 (2017)
AbstractBetween 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.
Publisher version (URL)http://dx.doi.org/10.1038/NGEO3032
URIhttp://hdl.handle.net/10261/156618
DOI10.1038/NGEO3032
ISSN1752-0894
E-ISSN1752-0908
Appears in Collections:(ICTJA) Artículos
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