Temperature and isotopic composition of seawater in the epicontinental sea (Central Paratethys) during the Middle Miocene Climate Transition based on Mg/Ca, δ 18 O and δ 13 C from foraminiferal tests

Scheiner, Filip; Holcová, Katarı́na; Milovský, Rastislav; Kuhnert, Henning

doi:10.1016/j.palaeo.2017.12.027

Cited by 30 publications

(12 citation statements)

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“…A similar value of bottom water temperature (12-13 °C) has been also used by [41] to demonstrate that gas hydrates were stable at 1000 m water depth in the Western Mediterranean during the upper Miocene. Considering the paleobathimetry of our seepage systems and the expected depth of the thermocline located between 500 and 1000 m, the bottom temperature reported by [78] during the Middle Miocene Climatic Optimum (~15 °C at 500 m depth) would support the value of about 10 °C obtained in our model. Therefore, it is conceivable to use this latter value for the calculation of paleo-gas hydrates stability zones in the Miocene, indicating the potential occurrence of shallow gas hydrates.…”

Section: Gas Hydrate Stability Along the Northern Apennine Margin Dursupporting

confidence: 81%

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

et al. 2019

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The occurrence of seep-carbonates associated with shallow gas hydrates is increasingly documented in modern continental margins but in fossil sediments the recognition of gas hydrates is still challenging for the lack of unequivocal proxies. Here, we combined multiple field and geochemical indicators for paleo-gas hydrate occurrence based on present-day analogues to investigate fossil seeps located in the northern Apennines. We recognized clathrite-like structures such as thin-layered, spongy and vuggy textures and microbreccias. Non-gravitational cementation fabrics and pinch-out terminations in cavities within the seep-carbonate deposits are ascribed to irregularly oriented dissociation of gas hydrates. Additional evidences for paleo-gas hydrates are provided by the large dimensions of seep-carbonate masses and by the association with sedimentary instability in the host sediments. We report heavy oxygen isotopic values in the examined seep-carbonates up to +6‰ that are indicative of a contribution of isotopically heavier fluids released by gas hydrate decomposition. The calculation of the stability field of methane hydrates for the northern Apennine wedge-foredeep system during the Miocene indicated the potential occurrence of shallow gas hydrates in the upper few tens of meters of sedimentary column.

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Section: Gas Hydrate Stability Along the Northern Apennine Margin Dursupporting

confidence: 81%

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

et al. 2019

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“…The opposite situation recorded in the Čebovce sections have been documented also from the Middle Miocene of the Carpathian Foredeep. Here, an increase of pH in sediment is suggested as a reason of this "inverse" carbon isotope values (Scheiner et al 2018(Scheiner et al , 2020. The identified pollen spectra represented by paleotropical flora (Palmae, Castaneoideae, Cyrillaceae, Araliaceae, Myricaceae) indicate subtropical climate ( Figure 10, Appendix 4).…”

Section: Paleoenvironment and Paleoecologymentioning

confidence: 98%

“…The effect of climate change on marine environment in Central Paratethys is evaluated by Piller et al (1997), Harzhauser et al (2003), Kováč et al (2007), Kroh (2007) and confirming global trends. A shift in the global trend was documented in the Central Carpathian Foredeep (Holcová and Demeny, 2012;Holcová et al, 2015Holcová et al, , 2018Scheiner et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The Pannonian Basin System northern margin paleogeography, climate and depositional environments in the time range during MMCT (Central Paratethys, Novohrad-Nógrád Basin, Slovakia)

Hudáčková

Holcová

Halásová

et al. 2020

Palaeontol Electron

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The Miocene global climatic changes together with profound regional tectonic activity significantly influenced the Central Paratethys epicontinental sea. The aim of this study was to reveal relationships between regional and global changes during the beginning Middle Miocene Climatic Transition. The work focused on the northern margin of the Pannonian Basin System, on the key Burdigalian and Langhian sites from the Novohrad-Nógrád and Danube basins (Slovakia). The outcrops and wells reveal variegated facial architecture, environments and processes. The sedimentary record can be subdivided into four main stratigraphic intervals: (i) The late Burdigalian (Karpatian) NN4 Zone. (ii) The earliest Langhian (Karpatian?-earliest Badenian; 14.9 Ma and older), top of NN4/base NN5 Zone. (iii) The lower Langhian (lower Badenian) deposits of NN5 Zone estimated to be ~14.9-14.4 Ma old. (iv) The late Langhian (lower Badenian) sediments of NN5b-5c Zone with estimated age of 14.4 Ma or younger. Langhian (lower Badenian) rift related volcanism was responsible both for pronounced relief formation and for supply of nutrients and silica into the basin. The Burdigalian/earliest Langhian shelf break slope mudstone (after hiatus) have been replaced by the Langhian inner to outer shelf environment dominated by tidal and wave processes. These were dominated by infaunal foraminifer associations which changed to epiphytic ones. Occasionally the patchreef environment was recorded by miliolide forms. In general, on the southern edge of the Krupina volcanic field the shelf setting passed into deltaic and fluvial deposits. Foraminiferal and calcareous nannoplankton assemblages point more to the nutrient decrease and circulation system change around the Bur/Lan boundary than to warm water condition, followed by cooling during the MMCT. Pollen spectra documents a slight post-Burdigalian cooling and aridification trend.

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“…For comparison, Mg/Ca ratios in several well-preserved fossil echinoid ossicles were determined with the aid of CAMECA SX100 electron microprobe (following the parameters outlined above The Mg/Ca ratios in these fossil ossicles were further used for the reconstruction of ancient seawater Mg 2+ /Ca 2+ ratios employing different algorithms: (a) partition coefficient: Mg/ Ca C = 0.03182(Mg/Ca SW ) (Dickson, 2004), (b) power partition function: Mg/Ca C = 0.0516(Mg/Ca SW ) 0.668 for test plates and Mg/ Ca C = 0.0213(Mg/Ca SW ) 0.538 for spines (Ries, 2004), (c) species-normalized Mg partition algorithm as a function of seawater Mg 2+ / Ca 2+ ratio and temperature: Mg/Ca C = S(0.000719T + 0.0292)Mg/ Ca SW 0.668 for test plates and Mg/Ca C = S(0.000837T + 0.0155)Mg/ Ca SW 0.538 for spines (Ries, 2004; where SW-seawater, C-calcite (skeleton), T-temperature, S-species coefficient. Temperature data for these calculations were taken from Wierzbowski & Joachimski (2007), and Scheiner, Holcová, Milovský & Kuhnert (2018) for the Bathonian and Miocene respectively; species coefficients (as defined by Ries, 2004) were calculated from the available literature data on the skeletal Mg/Ca ratios (converted from %MgCO 3 , if needed) of extant relatives of the fossil taxa, along with the temperature and the seawater Mg 2+ /Ca 2+ ratio (~5.2 mol/mol) in which these recent taxa lived (see Table 4). Skeletal Mg/Ca ratio for the test plates were collected from galleried/rectilinear stereom, except for one specimen, where geochemical data were also collected from the labyrinthic-like/perforate layer.…”

Section: Fossil Specimensmentioning

confidence: 99%

Effects of seawater Mg²⁺/Ca²⁺ ratio and diet on the biomineralization and growth of sea urchins and the relevance of fossil echinoderms to paleoenvironmental reconstructions

et al. 2020

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It has been argued that skeletal Mg/Ca ratio in echinoderms is mostly governed by Mg 2+ and Ca 2+ concentrations in the ambient seawater. Accordingly, well-preserved fossil echinoderms were used to reconstruct Phanerozoic seawater Mg 2+ /Ca 2+ ratio. However, Mg/Ca ratio in echinoderm skeleton can be affected by a number of environmental and physiological factors, the effects of which are still poorly understood. Notably, experimental data supporting the applicability of echinoderms in paleoenvironmental reconstructions remain limited. Here, we investigated the effect of ambient Mg 2+ /Ca 2+ seawater ratio and diet on skeletal Mg/Ca ratio and growth rate in two echinoid species (Psammechinus miliaris and Prionocidaris baculosa). Sea urchins were tagged with manganese and then cultured in different Mg 2+ /Ca 2+ conditions to simulate fluctuations in the Mg 2+ /Ca 2+ seawater ratios in the Phanerozoic. Simultaneously, they were fed on a diet containing different amounts of magnesium. Our results show that the skeletal Mg/Ca ratio in both species varied not only between ossicle types but also between different types of stereom within a single ossicle. Importantly, the skeletal Mg/Ca ratio in both species decreased proportionally with decreasing seawater Mg 2+ /Ca 2+ ratio. However, sea urchins feeding on Mg-enriched diet produced a skeleton with a higher Mg/Ca ratio. We also found that although incubation in lower ambient Mg 2+ /Ca 2+ ratio did not affect echinoid respiration rates, it led to a decrease or inhibition of their growth. Overall, these results demonstrate that although skeletal Mg/Ca ratios in echinoderms can be largely determined by seawater chemistry, the type of diet may also influence skeletal geochemistry, which imposes constraints on the application of fossil echinoderms as a reliable proxy. The accuracy of paleoseawater Mg 2+ /Ca 2+ calculations is further limited by the fact that Mg partition coefficients vary significantly at different scales (between species, specimens feeding on different types of food, different ossicle types, and stereom types within a single ossicle).

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Temperature and isotopic composition of seawater in the epicontinental sea (Central Paratethys) during the Middle Miocene Climate Transition based on Mg/Ca, δ 18 O and δ 13 C from foraminiferal tests

Cited by 30 publications

References 63 publications

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

The Pannonian Basin System northern margin paleogeography, climate and depositional environments in the time range during MMCT (Central Paratethys, Novohrad-Nógrád Basin, Slovakia)

Effects of seawater Mg²⁺/Ca²⁺ ratio and diet on the biomineralization and growth of sea urchins and the relevance of fossil echinoderms to paleoenvironmental reconstructions

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Temperature and isotopic composition of seawater in the epicontinental sea (Central Paratethys) during the Middle Miocene Climate Transition based on Mg/Ca, δ 18 O and δ 13 C from foraminiferal tests

Cited by 30 publications

References 63 publications

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

Evidences for Paleo-Gas Hydrate Occurrence: What We Can Infer for the Miocene of the Northern Apennines (Italy)

The Pannonian Basin System northern margin paleogeography, climate and depositional environments in the time range during MMCT (Central Paratethys, Novohrad-Nógrád Basin, Slovakia)

Effects of seawater Mg2+/Ca2+ ratio and diet on the biomineralization and growth of sea urchins and the relevance of fossil echinoderms to paleoenvironmental reconstructions

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Effects of seawater Mg²⁺/Ca²⁺ ratio and diet on the biomineralization and growth of sea urchins and the relevance of fossil echinoderms to paleoenvironmental reconstructions