An oxygen and sulfur isotopic study of gypsumfrom the Wapno Salt Dome cap-rock (Poland)

• Autorzy: Jaworska J.
• Języki publikacji: EN

Abstrakty

EN

The stable isotope compositions of oxygen and sulfur from gypsum samples derived from borehole cores of the Wapno Salt Domecap-rock have been determined. The d18O values were measured (for both the SO₄ and the H₂O) in bulk samples of gypsum(CaSO₄ 2H₂O) and in its dehydrated equivalents (CaSO₄). The SO₄ is enriched in the heavy oxygen isotope, which unequivocally indicates the Zechstein sea as the place of origin of the sulfate. The variable δ18O values of the H₂O (water of crystallization) indicate different conditions (and stages) of diagenetic processes of these samples, primarily recrystallization (hydration) episodes. Two groups ofgypsum were distinguished: (1) a group in which the δ18O values of H₂O range between -9.0 and -10.2‰ (interpreted as gypsum in equilibrium with recent or subrecent meteoric water), (2) a group in which the d18O values of the H2O were less than -10.2‰ (this gypsum hasrecrystallized in the presence of water enriched in the light isotopes of oxygen). In addition, in one single analysis the δ18O value of the H>sub>2O amounts to -5.6‰ (gypsum with mixed isotopic composition).

Słowa kluczowe

EN

Wapno Salt Dome; cap-rock; gypsum; oxygen and sulfur isotopes

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2010
• Tom: Vol. 54, No 1
• Strony: 25--32
• Opis fizyczny: Bibliogr. 37 poz., rys.

Twórcy

autor

Jaworska J.

• Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, PL-61-606 Poznań, Po land,,

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