Schwefelisotopenzusammensetzung von Baryten aus den Ost- und S�dalpen

Schroll, E.; Pak, Edwin

doi:10.1007/bf01081864

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…There have been many published reports noting the similarities in barite and evaporite 6 3 4~ compositions in rocks of the same age (e.g., Anger et al Rye et al 1978;Morrow et al 1978;Schroll and Pak 1980). There have also been reports of barites that are notably enriched in 34S (e.g., Goldberg et al 1969;Rye et al 1978;Sakai 1971) and 180 (Sakai 1971).…”

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confidence: 89%

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ³⁴S and δ¹⁸O age curves

Cecile¹,

Shakur²,

Krouse³

1983

Can. J. Earth Sci.

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Seventeen samples of stratiform barite hosted in Middle Cambrian to middle Mississippian marine sedimentary rocks of the western Canadian Cordillera were analyzed to determine their 6 3 4~ and 6180 values. Whereas some samples had isotopic values close to those for time-equivalent evaporites, others were clearly more enriched in the heavy oxygen and sulphur isotopes. Samples with isotopic values close to the evaporite curve were from very thick stratiform barites hosted mainly in organic-rich shales, and from thin and nodular beds hosted in organic-free sedimentary strata. All samples enriched in heavy isotopes were collected from thin or nodular deposits hosted in organic-rich sedimentary strata. Enrichment of barite in heavy isotopes can be achieved by a barite precipitation-dissolution process that cycles barium between oxygenated and reduced zones in either redox-stratified wet sediment, or sea water. This cycles requires barite to either settle from oxygenated sea water into more reducing water or to precipitate within or settle into wet sediment where Eh values are decreasing in situ during sediment buildup. Because all anomalously isotopically heavy barites are hosted in organic-rich strata, barite dissolution during this cycle likely occurs through the bacterial metabolism of organic matter and sulphate, during which sulphate with 1 6 0 and 3 2~ is preferentially broken down. The main products of this bacterial activity are C 0 2 and H2S, which can react to form carbonates or pyrite or can escape from the system, resulting in a depletion of light isotopes from the remaining aqueous sulphate. Because thick deposits of barite hosted in organic-rich shale, unlike smaller deposits hosted in the same strata, do not show heavy isotopic enrichment, the main factor controlling isotope fractionation is likely the rate of barite precipitation relative to barite dissolution and reduction.The 6 3 4~ versus 8180 values for six samples of Upper Devonian rocks plot fall on a line with a slope of 2. The data and observations presented here and in published reports indicate that alteration of the isotopic composition of stratiform barite strongly favours enrichment in heavy isotopes with respect to coeval sea-water sulphate. It should be possible then, to construct a barite sulphate isotopic composition age curve by averaging the lower 6180 and 634S values for samples of the same age.Dix-sept Cchantillons provenant d'un gite stratiforme de barite incorpork dans des roches skdimentaires marines d'bge cambrien moyen h mississippien moyen de la Cordillitre de l'ouest canadien furent analysCs pour determiner leurs valeurs de 634S et 6180. Bien que certains Cchantillons prksentaient des valeurs isotopiques se rapprochant d'kvaporites du m&me bge, d'autres Ctaient nettement plus enrichies en oxygkne lourd et en isotopes du soufre. Les tchantillons dont les valeurs isotopiques sont B proximitk de la courbe des Cvaporites proviennent de masses Cpaisses de barite stratiformes incluses principalement dans des schistes argileux rich...

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mentioning

confidence: 89%

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ³⁴S and δ¹⁸O age curves

Cecile¹,

Shakur²,

Krouse³

1983

Can. J. Earth Sci.

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Sulfur Isotope Investigations of Ore Mineralizations of the Eastern Alps

Schroll

Pak

1983

Mineral Deposits of the Alps and of the Alpine Epoch in Europe

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The Stratiform Lead-Zinc Mineralisation of the “Paleozoic of Graz“ (Styria, Austria)

Weber¹

1983

Mineral Deposits of the Alps and of the Alpine Epoch in Europe

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Schwefelisotopenzusammensetzung von Baryten aus den Ost- und S�dalpen

Cited by 10 publications

References 13 publications

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ³⁴S and δ¹⁸O age curves

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ³⁴S and δ¹⁸O age curves

Sulfur Isotope Investigations of Ore Mineralizations of the Eastern Alps

The Stratiform Lead-Zinc Mineralisation of the “Paleozoic of Graz“ (Styria, Austria)

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Schwefelisotopenzusammensetzung von Baryten aus den Ost- und S�dalpen

Cited by 10 publications

References 13 publications

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ34S and δ18O age curves

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ34S and δ18O age curves

Sulfur Isotope Investigations of Ore Mineralizations of the Eastern Alps

The Stratiform Lead-Zinc Mineralisation of the “Paleozoic of Graz“ (Styria, Austria)

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The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ³⁴S and δ¹⁸O age curves

The isotopic composition of western Canadian barites and the possible derivation of oceanic sulphate δ³⁴S and δ¹⁸O age curves