The sulphur and oxygen isotopic composition of Lower Cambrian anhydrites in East Siberia

• Autorzy: Peryt T. M. , Hałas S. , Kovalevych V. M. , Petrychenko O. Y. , Dzhinoridze N. M.
• Konferencja: Stable isotope records of environmental change. European Society for Isotope Research. VII Isotope Workshop, Graz 2004
• Języki publikacji: EN

Abstrakty

EN

Published sulphur and oxygen isotope age curves for the late Neoproterozoic-Early Cambrian time interval have been based on studies of sulphate intervals of the East Siberian salt giant. We report here on sulphur and oxygen measurements for sulphate dispersed in, or forming laminae in, the rock salt deposits in all Lower Cambrian basins of East Siberia. Sulphur isotope data for 26 samples of Lower Cambrian anhydrites from East Siberia range from +22.6 to +34.5‰. No difference was observed between different suites and between samples taken from anhydrite intercalations in rock salt and from water-insoluble residue in rock salt. Oxygen isotope data for 25 anhydrite samples range from +12.4 to +17.8‰, and thus δ¹⁸ O values have a smaller range of variation (5.5‰) than δ³⁴ S (11.8‰) over the entire set of Lower Cambrian anhydrites. The great δ³⁴ S variability observed in the Lower Cambrian of Siberia seems to reflect mixing of sulphates coming from the ocean and due to the riverine input. The lowest δ¹⁸ O values may indicate the input values from both the sources, whilst the highest value may result from isotope exchange between SO₄ 2- and water. Our results combined with data provided by previous workers could indicate a clear stratigraphic trend in δ³⁴ S values, with a remarkable fall of ca. 9‰ in δ³⁴ S value during the earliest Cambrian and then a slight rise in δ³⁴ S values in the younger part of Early Cambrian. However, if only the highest values are taken, the measured values are compatible with seawater δ³⁴ S 3 30‰ during the entire Early Cambrian. Sulphur isotopic composition of sulphate minerals did not be come heavier from the sulphate stage to ward the chloride stage.

Słowa kluczowe

EN

Siberia; Lower Cambrian; evaporites; sulphur isotopes; oxygen isotopes

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 2
• Strony: 235--242
• Opis fizyczny: Bibliogr. 28 poz., rys., tab., wykr.

Twórcy

autor

Peryt T. M.

• Polish Geological Institute, Rakowiecka 4, PL-00-975 Warszawa, Poland

autor

Hałas S.

• Institute of Physics, Maria Curie-Sklodowska University, PL-20-031 Lublin, Poland

autor

Kovalevych V. M.

• Polish Geological Institute, Rakowiecka 4, PL-00-975 Warszawa, Poland
• Institute of Geology and Geochemistry, National Academy of Sciences of Ukraine, Naukova 3a, 79053 Lviv, Ukraine

autor

Petrychenko O. Y.

• Institute of Geology and Geochemistry, National Academy of Sciences of Ukraine, Naukova 3a, 79053 Lviv, Ukraine

autor

Dzhinoridze N. M.

• VNIIG Stock Co., Sankt Petersburg, Russia

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