Hypersalinity accompanies tectonic restriction in the eastern Mediterranean prior to the Messinian Salinity Crisis

Kontakiotis, George; Butiseaca, Geanina; Antonarakou, Assimina; Agiadi, Konstantina; Zarkogiannis, Stergios D.; Krsnik, Emilija; Besiou, Evangelia; Zachariasse, Willem-Jan; Lourens, Lucas Joost; Thivaiou, Danae; Koskeridou, Efterpi; Moissette, Pierre; Mulch, Andreas; Karakitsios, V.; Vasiliev, Iuliana

doi:10.1016/j.palaeo.2022.110903

Cited by 32 publications

(27 citation statements)

References 96 publications

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“…In contrast, the positive shift of δ 18 O B.albyi at 6.68 Ma is accompanied by an analogous shift of δ 18 O L.friesii (Figures 2F, 2H, S1), reflecting similar change in both surface and bottom waters, most likely in temperature (~4.7 °C; Figure 2B) rather than salinity (Kontakiotis et al, 2022).…”

Section: Surface and Bottom-water Conditionsmentioning

confidence: 91%

“…We used the value of −0.8‰ in the calculations of M B.albyi and of M L.friesii corresponding to the carbonate and homogeneous marl levels at the base of the section, and the value of −3.5‰ in the calculation of M L.friesii for the laminated marl (sapropelitic) levels. We used the oxygen and carbon stable isotopic composition of foraminifera shells of the planktonic species Globigerinoides obliquus (δ 13 C G.obliquus ) (Kontakiotis et al, 2022) and the benthic species Cibicides (pseudo)ungerianus (δ 13 C C.ung ) (Zachariasse et al, 2021) as the δ 13 C diet in the case of B. albyi and L. friesii, respectively, because foraminifera were considered representative of the fishes' diets. Information on the foraminifera analyses may be found in the supplement.…”

Section: Methodsmentioning

confidence: 99%

“…. (Kontakiotis et al, 2022); d) the ratio of isoprenoidal glycerol dialkyl glycerol tetraethers 2 and 3 (isoGDGT2/isoGDGT3) (Kontakiotis et al, 2022), which increases with isoGDGTs input from subsurfacedwelling archaea (Schouten et al, 2002); and e) BIT (branched and isoprenoid tetraether) index values (Butiseacă et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

“…97-5.33 Ma;Hsü et al, 1973;Krijgsman et al, 1999). The basin's restriction resulted in highamplitude shifts in sea surface temperature (SST) and salinity (SSS), and episodic water-column stratification and dysoxia on the sea bottom, even before the MSC (e.g., Vasiliev et al, 2019;Sabino et al, 2020;Bulian et al, 2021;Kontakiotis et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Coupled otolith and foraminifera oxygen and carbon stable isotopes evidence paleoceanographic changes and fish metabolic responses

Agiadi¹,

Vasiliev²,

Butiseacă³

et al. 2024

Preprint

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Stable oxygen and carbon isotopic composition of the otoliths of a pelagic and a benthic fish species are used as indicators of sea surface and bottom salinity-oxygenation conditions, as well as proxies of the fishes’ metabolic response to the paleoceanographic changes in the eastern Mediterranean from 7.2 to 6.5 Ma. The step-wise restriction of the Mediterranean–Atlantic gateway impacted the ability of the Mediterranean fishes to grow, particularly those dwelling in the sea bottom. The most important changes identified are: 1) a negative water budget (evaporative) event at 6.82–6.81 Ma that resulted in an increase in fish metabolism and respiration, and 2) a warming event at 6.70–6.69 Ma that further intensified the environmental stress for bottom-water fish and increased their metabolic activity despite low food availability. The results provide proof that the resilience of the benthic fish population was hampered, particularly after the 6.70–6.69 Ma event, due to the increased salinity, temperature and stratification of the water column in the eastern Mediterranean as a result of the marine gateway restriction.

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Section: Surface and Bottom-water Conditionsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupled otolith and foraminifera oxygen and carbon stable isotopes evidence paleoceanographic changes and fish metabolic responses

Agiadi¹,

Vasiliev²,

Butiseacă³

et al. 2024

Preprint

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“…They can survive under high temperatures of 30 • C [15], and some relevant studies have been reported from both coastal and open oceans in tropical regions [16]. The high-temperature effects on the shell pore size and the density [17,18] and any changes in shell morphometry and size [19], can describe the evidence of the past marine sedimentary records in the ocean [20,21].…”

Section: Introductionmentioning

confidence: 99%

Horizontal Distribution and Carbon Biomass of Planktonic Foraminifera in the Eastern Indian Ocean

Munir¹,

Sun

Morton

et al. 2022

Water

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Distribution and carbon biomass of planktonic foraminifera were investigated from the euphotic zone of the Eastern Indian Ocean during a two-month cruise, ‘Shiyan I’ (10 April–13 May 2014). Foraminifera species were collected through plankton net sampling at 44 locations (80.00°–96.10° E, 10.08° N–6.00° S). The temperature (°C) ranged between 12.82 and 31.8 °C, the salinity ranged between 32.5 and 35.5, and chlorophyll-a concentrations ranged between 0.005 µg/L and 0.89 µg/L. A total of 20 taxa were identified based on the spherical chamber shell, spines, and a final whorl which were examined under light microscopy and scanning electron microscopy. Dominant species that were characterized by the high dominant index Y > 0.14–0.46 were Globigerina bulloides, Globigerinoides ruber white, Globigerinella siphonifera, Turborotalita quinqueloba, and Globigerinella calida, contributing to the community up to 86%. The shell size of collected taxa was from 51 to 508 μm and the total carbon biomass was estimated to be between 0.062 µg C m–3 and 26.52 µg C m–3. The high carbon biomass was recorded at two stations in the equator zone. Due to its large size, Globorotalia menardii had total carbon biomass of 3.9 µg C m–3, followed by G. calida 0.68 µg C m−3, Trilobatus sacculifer 0.38 µg C m–3, Orbulina universa 0.56 µg C m–3, and G. ruber white 0.22 µg C m–3, respectively. The Pearson correlation analysis showed that the temperature and chlorophyll-a were two explanatory environmental variables that were found to be highly significant (p < 0.05) and that triggered the distribution and abundance of dominant foraminifera species in the study region. Overall, high abundances and carbon biomass were derived from the euphotic zone and equatorial region of the Eastern Indian Ocean.

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Sedimentary facies controls on reservoir quality of the Abu Madi Formation, offshore Nile Delta Basin, Egypt

Assal,

Farouk,

Sarhan

2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The present study investigates the sedimentological analysis and petrophysical properties of the Messinian Abu Madi reservoir (AMR), offshore Nile Delta Basin in order to determine how facies heterogeneities control reservoir quality. This approach was performed by integrating core data from Mina-1 well and BE-1 well and wireline logs from four wells (BN-1, BN-2, BE-3 and Mina-1). Based on core studies, seven clastic facies have been identified, of which five form sandstone reservoirs. These facies have accumulated within a deep incised canyon-fill during four successive fluvial sub-environments; braided fluvial channel, point bar, floodplain, and abandoned channel. These fluvial sediments were changed into tidally influenced fluvial/estuarine deposits with aggradational-retrogradational stacking patterns due to a transgressive event during the Messinian time. Based on the well log petrophysical evaluation, the Abu Madi reservoir has a total porosity of 0.20–0.26 v/v and effective porosity in the 0.18–0.25 v/v range. Shale volume ranges from 0.04 to 0.09 v/v, and water saturation ranges between 0.15 and 0.45 v/v. Four reservoir rock types were recognized and interpreted as a function of composition and therefore having different petrophysical characteristics. RRT1 and RRT2 show good petrophysical properties and good reservoir quality. The best reservoir quality occurs in massive sandstones (RRT3), which have porosities up to 26% and permeabilities up to 1440 mD. RRT4 has a poor reservoir quality with porosity of 5.4% and permeability of 0.6 mD. The reservoir porosity heterogeneities and reservoir quality have been strongly impacted by the original composition and primary depositional facies.

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Hypersalinity accompanies tectonic restriction in the eastern Mediterranean prior to the Messinian Salinity Crisis

Cited by 32 publications

References 96 publications

Coupled otolith and foraminifera oxygen and carbon stable isotopes evidence paleoceanographic changes and fish metabolic responses

Coupled otolith and foraminifera oxygen and carbon stable isotopes evidence paleoceanographic changes and fish metabolic responses

Horizontal Distribution and Carbon Biomass of Planktonic Foraminifera in the Eastern Indian Ocean

Sedimentary facies controls on reservoir quality of the Abu Madi Formation, offshore Nile Delta Basin, Egypt

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