Paratethys pacing of the Messinian Salinity Crisis: Low salinity waters contributing to gypsum precipitation?
| Autor: | Grothe, A., Andreetto, F., Reichart, G.J., Wolthers, M., van Baak, C.G.C., Vasiliev, I., Stoica, M., Sangiorgi, F., Middelburg, Jack J., Davies, G.R., Krijgsman, W., Paleomagnetism, Stratigraphy and paleontology, Geochemistry, Marine palynology and palaeoceanography |
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| Přispěvatelé: | Earth Sciences, CLUE+, Paleomagnetism, Stratigraphy and paleontology, Geochemistry, Marine palynology and palaeoceanography |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Mediterranean climate
Gypsum 010504 meteorology & atmospheric sciences Evaporite Evaporites Geochemistry Stratification (water) engineering.material evaporites Mediterranean 010502 geochemistry & geophysics 01 natural sciences salinity Water column Geochemistry and Petrology Taverne Earth and Planetary Sciences (miscellaneous) strontium SDG 14 - Life Below Water 0105 earth and related environmental sciences Miocene 6. Clean water gypsum Salinity Geophysics 13. Climate action Space and Planetary Science engineering Halite Surface water Geology |
| Zdroj: | Earth and Planetary Science Letters, 532:116029, 1-12. Elsevier Earth and Planetary Science Letters Earth and Planetary Science Letters, 532, 1. Elsevier Grothe, A, Andreetto, F, Reichart, G J, Wolthers, M, Van Baak, C G C, Vasiliev, I, Stoica, M, Sangiorgi, F, Middelburg, J J, Davies, G R & Krijgsman, W 2020, ' Paratethys pacing of the Messinian Salinity Crisis : Low salinity waters contributing to gypsum precipitation? ', Earth and Planetary Science Letters, vol. 532, 116029, pp. 1-12 . https://doi.org/10.1016/j.epsl.2019.116029 |
| ISSN: | 0012-821X |
| DOI: | 10.1016/j.epsl.2019.116029 |
| Popis: | During the so-called Messinian Salinity Crisis (MSC: 5.97-5.33 Myr ago), reduced exchange with the Atlantic Ocean caused the Mediterranean to develop into a “saline giant” wherein ~1 million km3 of evaporites (gypsum and halite) were deposited. Despite decades of research it is still poorly understood exactly how and where in the water column these evaporites formed. Gypsum formation commonly requires enhanced dry conditions (evaporation exceeding precipitation), but recent studies also suggested major freshwater inputs into the Mediterranean during MSC-gypsum formation. Here we use strontium isotope ratios of ostracods to show that low-saline water from the Paratethys Seas actually contributed to the precipitation of Mediterranean evaporites. This apparent paradox urges for an alternative mechanism underlying gypsum precipitation. We propose that Paratethys inflow would enhance stratification in the Mediterranean and result in a low-salinity surface-water layer with high Ca/Cl and SO4/Cl ratios. We show that evaporation of this surface water can become saturated in gypsum at a salinity of ~40, in line with salinities reported from fluid inclusions in MSC evaporites. |
| Databáze: | OpenAIRE |
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