The discovery of Lake Hephaestus, the youngest athalassohaline deep-sea formation on Earth View Full Text


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Article Info

DATE

2019-12

AUTHORS

Violetta La Cono, Giovanni Bortoluzzi, Enzo Messina, Gina La Spada, Francesco Smedile, Laura Giuliano, Mireno Borghini, Christine Stumpp, Philippe Schmitt-Kopplin, Mourad Harir, William K. O’Neill, John E. Hallsworth, Michail Yakimov

ABSTRACT

Hydrated, magnesium-rich minerals and subglacial brines exist on the martian surface, so the habitability of high-Mg2+ environments on Earth has extraterrestrial (as well as terrestrial) implications. Here, we report the discovery of a MgCl2-dominated (4.72 M) brine lake on the floor of the Mediterranean Ridge that underlies a 3500-m water column, and name it Lake Hephaestus. Stable isotope analyses indicated that the Hephaestus brine is derived from interactions between ancient bishofite-enriched evaporites and subsurface fluids. Analyses of sediment pore waters indicated that the Hephaestus depression had contained the MgCl2 brine for a remarkably short period; only 700 years. Lake Hephaestus is, therefore, the youngest among currently known submarine athalassohaline brine lakes on Earth. Due to its biologically hostile properties (low water-activity and extreme chaotropicity), the Hephaestus brine is devoid of life. By contrast, the seawater-Hephaestus brine interface has been shown to act as refuge for extremely halophilic and magnesium-adapted stratified communities of microbes, even at MgCl2 concentrations that approach the water-activity limit for life (0.653). More... »

PAGES

1679

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-018-38444-z

DOI

http://dx.doi.org/10.1038/s41598-018-38444-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112023603

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30737448


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curl -H 'Accept: application/n-triples' 'https://scigraph.springernature.com/pub.10.1038/s41598-018-38444-z'

Turtle is a human-readable linked data format.

curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1038/s41598-018-38444-z'

RDF/XML is a standard XML format for linked data.

curl -H 'Accept: application/rdf+xml' 'https://scigraph.springernature.com/pub.10.1038/s41598-018-38444-z'


 

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