Temat: strontium isotopes - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Strontium isotope composition of Badenian (Middle Miocene) Ca-sulphate deposits in West Ukraine: a preliminary study m
Autorzy:: Peryt, T. M.
Hryniv, S.
Anczkiewicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/2059023.pdf
Data publikacji:: 2010
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Middle Miocene
evaporites
strontium isotopes
gypsum
Paratethys
Opis:: Strontium isotope compositions have been measured in six primary gypsum samples from the most marginal part of the Badenian evaporite succession in the Ukrainian Carpathian Foredeep Basin (Mamalyha quarry section) and in two anhydrite samples from the basin-centre halite zone of the Ukrainian Carpathian Foredeep, aimed determining the origin of brines from which these sulphates were precipitated. The strontium isotope ratios (87868868761887 6878786
Źródło:: Geological Quarterly; 2010, 54, 4; 465-476
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Sulphur, oxygen and strontium isotope compositions of Middle Miocene (Badenian) calcium sulphates from the Carpathian Foredeep, Poland: palaeoenvironmental implications
Autorzy:: Kasprzyk, A.
Pueyo, J.J.
Hałas, S.
Fuenlabrada, J.M.
Powiązania:: https://bibliotekanauki.pl/articles/2059523.pdf
Data publikacji:: 2007
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Carpathian Foredeep
Badenian
sulphur
oxygen and strontium isotopes
sulphate deposits
Opis:: Sulphur, oxygen and strontium isotope compositions have been measured in sulphate (gypsum and anhydrite) sam ples from the Badenian evaporite complex in the Carpathian Foredeep Basin (Poland) to determine the origin of brines from which these sulphates were formed. Studied samples display the d values from +22.68 to +24.91‰ CDT for sulphur (ten samples) and from +12.26 to +13.63‰ SMOW for oxygen (ten samples), and 87Sr/86Sr ratios from 0.708915 to 0.716329 (six samples). Most samples show isotopic values (both d34S and 87Sr/86Sr) higher than contem poraneous (Badenian) sea water, and thus suggest that these sulphates were formed (i) from brines with a significant component of non-marine waters, (ii) in a restricted system, where an important role was played by meteoric water inputs as well as by bacterial sulphate reduction. The results of this study show clear differences in the isotopic signatures between sedimen tary (gypsum) and diagenetic (anhydrite) lithofacies. While sedimentary gypsum displays sulphur, oxygen and strontium isotope ratios close to contemporaneous (Badenian) sea water, diagenetic anhydrite values are largely elevated. The higher isotopic values (d34S, d18O and 87Sr/86Sr) for anhydrite when compared to gypsum are interpreted as reflecting different hydrological provenances of sulphate in the Badenian basin. Gypsum was formed from brines marine in origin that were subject to an important in flow of continental waters and a local bacterial sulphate reduction in arestricted, and there fore sulphate-limited basin, which is consistent with earlier interpre tations based on sedimentological and geochemical studies. Our study shows that brines from which anhydrite was formed had a highly-radiogenic non-marine (riverine, ground water) strontium component, which is a new contribution to the knowledge on the Badenian sulphate formation. The results reflect a lateral compositional evolution of parent waters during sulphate deposition and diagenesis in the Carpathian Foredeep Basin.
Źródło:: Geological Quarterly; 2007, 51, 3; 285-294
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Isotopic composition of dolomite associated with Middle Miocene Badenian anhydrites in the Carpathian Foredeep Basin of SE Poland
Autorzy:: Jasionowski, M.
Peryt, T.M.
Powiązania:: https://bibliotekanauki.pl/articles/2059029.pdf
Data publikacji:: 2010
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Middle Miocene
Paratethys
dolomite
anhydrite
carbon and oxygen isotopes
strontium isotopes
Opis:: Dolomite is a quite common, although usually minor, constituent of the Badenian sulphate deposits of the Carpathian Foredeep Basin. In the autochthonous member of the Wola Różaniecka 7 borehole (SE Poland) which contains well preserved, large anhydritic pseudo-morphs after selenitic gypsum, dolomite constitutes up to 75% of the rock volume, the rest being anhydrite. Dolomites mostly show peloidal clotted microfabrics typical of microbialites and are interpreted as products of microbially induced precipitation and/or dolomitisation at temperatures around 40°C (as interpreted from the d18131813
Źródło:: Geological Quarterly; 2010, 54, 4; 533-548
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Strontium isotopes in the Zechstein (Upper Permian) anhydrites of Poland: evidence of varied meteoric contributions to marine brines
Autorzy:: Denison, R. E.
Peryt, T. M.
Powiązania:: https://bibliotekanauki.pl/articles/2059197.pdf
Data publikacji:: 2009
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Polska
Zechstein
Late Permian
anhydrite
strontium isotopes
Opis:: Strontium isotope ratios have been determined on 74 anhydrite samples from seven borehole cores in the Polish Zechstein. Five of the borehole cores are located in the basin and isotope results from these samples show a nearly pure marine signal. Results from one borehole core, located near the Zechstein coastline that migrated through time, record a stronger, in consistent influence of continental strontium to a marine base. Intermittent meteoric influence is recorded in anhydrites from other borehole cores close to the carbonate platform that was emergent during the anhydrite deposition. Consistency of isotope values indicates a marine signal and there is a narrow range in consistent values from 87Sr/86Sr near deltasw –215 (0.70702) for the oldest anhydrites and near deltasw –205 (0.70712) for the youngest an hydrites. Comparison with a sea water 87Sr/86Sr curve based on samples in West Texas and a Permian-Triassic boundary value from China shows that the Polish Zechstein in these seven boreholes is latest Permian in age and major deposition represents a short time interval (~2 million years). Strontium isotope ratios reported by other workers indicate some of the younger Zechstein elsewhere indicate even greater continental influence is in agreement with the interpreted sedimentological set ing for those anhydrites.
Źródło:: Geological Quarterly; 2009, 53, 2; 159-166
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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