Temporal stability and origin of chemoclines in the deep hypersaline anoxic Urania basin

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Goldhammer, T., Schwärzle, A., Aiello, I. W., & Zabel, M. (2015). Temporal stability and origin of chemoclines in the deep hypersaline anoxic Urania basin. Geophysical Research Letters, 42(12), 4888-4895. doi:10.1002/2015GL063758
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TitleTemporal stability and origin of chemoclines in the deep hypersaline anoxic Urania basin
AuthorsT. Goldhammer, A. Schwärzle, I. Aiello, M. Zabel
AbstractSubmarine brine lakes feature sharp and persistent concentration gradients between seawater and brine, though these should be smoothed out by free diffusion in open ocean settings. The anoxic Urania basin of the eastern Mediterranean contains an ultrasulfidic, hypersaline brine of Messinian origin above a thick layer of suspended sediments. With a dual modeling approach we reconstruct its contemporary stratification by geochemical solute transport fundamentals and show that thermal convection is required to maintain mixing in the brine and mud layer. The origin of the Urania basin stratification was dated to 1650 years B.P., which may be linked to a major earthquake in the region. The persistence of the chemoclines may be key to the development of diverse and specialized microbial communities. Ongoing thermal convection in the fluid mud layer may have important yet unresolved consequences for sedimentological and geochemical processes, also in similar environments. © 2015. American Geophysical Union. All Rights Reserved.
JournalGeophysical Research Letters
Date2015
Volume42
Issue12
Start page4888
End page4895
ISSN00948276
Subjectschemoclines, deep hypersaline basins, geochemical modeling, suspended sediment, thermal convection
NoteExport Date: 19 February 2016, Article

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