New constraints on the evolution of 87Sr/86Sr of seawater during the Upper Triassic

Kovács, Zsófía; Demangel, Isaline; Richoz, Sylvain; Hippler, Dorothee; Baldermann, Andre; Krystyn, Leopold

doi:10.1016/j.gloplacha.2020.103255

Cited by 18 publications

(18 citation statements)

References 101 publications

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“…The noble gas data support a very strong mantle connection with about 87.2-97.2% mantle He origin. The predominant Sr origin in the second, mixed (b) group with higher Sr concentrations and ratios is attributed to a strong dissolution of Triassic carbonates, with isotopic values very similar to Triassic carbonates and Triassic Sea water (Kovács et al, 2020). Observed values are close to published ones (Calligaris et al, 2018;Faure et al, 1978;Zuliani et al, 2020).…”

Section: Strontium In Watersupporting

confidence: 63%

“…Miocene (upper and middle-upper Badenian) sediments west of Rogaska Slatina (at Mestinje) have been investigated (Kocsis et al, 2008) which show 0.7118-0.7165 values in sediments and 0.7088 in fossils. In the Classical Karst Region, Calligaris et al (2018) RMSW-Recent Mediterranean Seawater (Henderson et al, 1994;Liotta et al, 2017); TSW-Triassic Seawater (Kovács et al, 2020); Hydrothermal influx (Pearce et al, 2015;Spooner, 1976); Miocene sediments Rogaska Slatina (Kocsis et al, 2008) produced from Voda 902 where carbonate aquifer is influenced also by clastic rocks. The ratio of 0.71942 ± 0.00026 is a result of silicate weathering.…”

Section: Strontium In Watermentioning

confidence: 99%

“…Fig.11Concentration and isotope ratio of strontium (left yaxis) and comparison to Sr/Cl concentration (right y-axis). RMSW-Recent Mediterranean Seawater(Henderson et al, 1994;Liotta et al, 2017); TSW-Triassic Seawater(Kovács et al, 2020); Hydrothermal influx(Pearce et al, 2015;Spooner, 1976); Miocene sediments Rogaska Slatina(Kocsis et al, 2008) …”

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confidence: 99%

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Chemical and isotopic composition of CO2-rich magnesium–sodium–bicarbonate–sulphate-type mineral waters from volcanoclastic aquifer in Rogaška Slatina, Slovenia

Rman

Szőcs

Palcsu

et al. 2021

Environ Geochem Health

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Bottled natural mineral waters from an andesitic aquifer in Slovenia are enriched in magnesium (1.1 g/l), sulphate (2.2 g/l) and dissolved inorganic carbon (204 g/l). We analysed major ions, trace elements, tritium activity, 14C, δ18OH2O, δ2HH2O,δ13CDIC, gas composition and noble gases in six wells. In addition, 87Sr//86Sr, δ34SSO4 and δ11B were analysed here for the first time. Stable isotopes with δ18O = −11.97 to −10.30‰ and δ2H = −77.3 to −63.8 confirm meteoric origin. CO2 degassing is evident at three wells, causing the oxygen shift of about −1.3‰. Tritium activity was detectable only in the shallowest well, where the freshwater component was dated to the 1960s. δ13CDIC in five waters is −1.78 to + 1.33‰, typical of carbonate dissolution. Radiocarbon is low, 1.03–5.16 pMC. Chemical correction with bicarbonate concentration and δ13C correction methods gave best mean residence times, slightly longer than previously published. Sulphate has δ34S 26.6–28.9‰ and δ18O 8.9–11.1‰ due to dissolution of evaporites in carbonate rocks. Boron at concentrations of 1.2–6.1 mg/l has two origins: δ11B = 11.3–16.4‰ from hydrothermal alteration and δ11B = 26.6–31.7‰ from carbonate dissolution. Strontium at concentrations of 0.5–22.0 mg/l has 87Sr//86Sr, indicating three sources: 0.7106 for Miocene clastic rocks, 0.7082 for Triassic carbonates and 0.7070 for Lower Oligocene andesitic rocks. CO2 represents the majority of the dissolved (> 98.84 vol%) and separated gas (> 95.23 vol%). Methane is only found in two wells with a max. of 0.30 vol%. All waters show excess helium and 16–97% of mantle-derived helium. Since all show subsurface degassing, the paleo-infiltration temperature could not be calculated.

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Section: Strontium In Watersupporting

confidence: 63%

Section: Strontium In Watermentioning

confidence: 99%

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Chemical and isotopic composition of CO2-rich magnesium–sodium–bicarbonate–sulphate-type mineral waters from volcanoclastic aquifer in Rogaška Slatina, Slovenia

Rman

Szőcs

Palcsu

et al. 2021

Environ Geochem Health

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“…18). Recent detailed studies performed in pelagic deep shelf successions in the Northern Calcareous Alps, Austria coeval with the "Keszthely-type dolomite" and the lower member of the Rezi Dolomite sequences confirmed this very characteristic trend (Kovács et al 2020), since the range of 87 Sr/ 86 Sr ratios measured on the samples derived from the upper part of the cyclic beds of the Fődolomit Formation, the "Keszthely-type dolomite" unit and the Rezi Dolomite, respectively, fits well into the range of the upper Middle Norian to Upper Norian values (Fig. 18).…”

Section: Interpretation and Discussionmentioning

confidence: 80%

Dolomitization of Late Norian carbonate deposits of restricted basin facies in the Keszthely Mts., Transdanubian Range, Hungary

Haas

Budai

Hips

et al. 2021

Int J Earth Sci (Geol Rundsch)

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In the Transdanubian Range (Hungary), a wide spectrum of Triassic dolomites is known. Mechanism of dolomitization of the platform carbonate successions was subject of a number of studies but the study of dolomitization of basinal carbonates is very limited. Petrographical and isotope–geochemical characteristics of the Upper Triassic dolomitized carbonate deposits, formed in a fault-controlled intraplatform basin, and interpretation of the dolomite-forming processes are presented in the current paper. From the latest Carnian to Middle Norian under semi-arid climatic conditions density-driven flux of seawater derived mesohaline fluids was the dominant mechanism of the near-surface pervasive dolomitization of the thick platform carbonate succession. In the late Middle Norian incipient rifting of the Alpine Tethys led to establishment of an extensional structural regime and onset of the formation of the Kössen Basin. In the study area, above the dolomitized platform carbonate succession, platform-derived carbonate sediments were accumulated in a fault-bounded, semi-restricted sub-basin of the Kössen Basin, whereas talus breccias and debrites were deposited near a basin-bounding master fault. The basin deposits (lower and upper members of the Rezi Dolomite Formation) were subject of early diagenetic dolomitization in shallow burial setting. Enhanced salinity seawater was the dolomitizing fluid; the synsedimentary fracturing may have promoted the fluid flow and thereby the dolomitization. Thick-bedded carbonates (middle member of the Rezi Dolomite Formation) representing a progradational tongue of the ambient platform are intercalated between the basin deposits. The dolomitization of this unit can be explained by the reflux model.

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“…Complementary analyses of radiogenic Sr ( 87 Sr/ 86 Sr) isotopic compositions of the erzbergite, dolomite-bearing layers, carbonate host rocks and meteoric water-derived solutions provide additional clues on the provenance of Sr in the carbonates, the origin of water and fluid-rock interactions 57 , with implications for the interpretation of modern hydrochemistry at Erzberg. Specifically, from the cross-plot of the 87 Sr/ 86 Sr composition vs. 1/Sr (Fig.…”

Section: Discussionmentioning

confidence: 99%

Fracture dolomite as an archive of continental palaeo-environmental conditions

Baldermann

Mittermayr

Bernasconi

et al. 2020

Commun Earth Environ

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The origin of Quaternary dolomites in continental environments (e.g. karst and lakes) is barely constrained compared to marine dolomites in sedimentary records. Here we present a study of dolomite and aragonite formations infilling young fractures of the ‘Erzberg’ iron ore deposit, Austria, under continental-meteoric and low temperature conditions. Two dolomite generations formed shortly after the Last Glacial Maximum (~20 kyr BP): dolomite spheroids and matrix dolomite. Clumped isotope measurements and U/Th disequilibrium ages reveal formation temperatures of 0–3 °C (±6 °C) and 3–20 °C (±5 °C) for the both dolomite types, and depositional ages around 19.21 ± 0.10 kyr BP and 13.97 ± 0.08 kyr BP or younger, respectively. Meteoric solution and carbonate isotope compositions (δ18O, δ13C and 87Sr/86Sr) indicate the dolomites formed via aragonite and high-Mg calcite precursors from CO2-degassed, Mg-rich solutions. Our study introduces low temperature dolomite formations and their application as a sedimentary-chemical archive.

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New constraints on the evolution of 87Sr/86Sr of seawater during the Upper Triassic

Cited by 18 publications

References 101 publications

Chemical and isotopic composition of CO2-rich magnesium–sodium–bicarbonate–sulphate-type mineral waters from volcanoclastic aquifer in Rogaška Slatina, Slovenia

Chemical and isotopic composition of CO2-rich magnesium–sodium–bicarbonate–sulphate-type mineral waters from volcanoclastic aquifer in Rogaška Slatina, Slovenia

Dolomitization of Late Norian carbonate deposits of restricted basin facies in the Keszthely Mts., Transdanubian Range, Hungary

Fracture dolomite as an archive of continental palaeo-environmental conditions

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