Geneza węglanów rozproszonych w dolnośląskich bazaltoidach kenozoicznych : badania izotopowe węgla i tlenu

Szynkiewicz, A.; Górka, M.; Jędrysek, M. O.

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Tytuł artykułu

Geneza węglanów rozproszonych w dolnośląskich bazaltoidach kenozoicznych : badania izotopowe węgla i tlenu

Autorzy

Szynkiewicz A. , Górka M. , Jędrysek M. O.

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Warianty tytułu

The origin of scattered carbonates in the Cenozoic Silesian basaltoids and their ultramafic xenoliths : carbon and oxygen isotope

Języki publikacji

Abstrakty

Carbon and oxygen isotope composition of scattered grain carbonates in the Cenozoic Silesian basaltoids and their ultramafic xenoliths were estimated. The δ¹³ CPDB and δ¹⁸ OSMOW values of these carbonates showed wide ranges from-24.16 to-7.86‰ and from 15.37 to 34.31‰, respectively. These values significantly differ from the δ¹³ C and δ¹⁸ O values typical for carbonates of magmatic origin. The carbonates analysed occurred only in basaltoids cutting through carbonates-rich sedimentary rocks. Accordingly, we considered two different models: theoretical [based on mathematical calculation] and empirical [based on δ¹³ C values analysed], to explain the origin of carbonates in the basaltoids under study. The first model showed that carbonates could crystallize under following conditions: [i] mixing of magmatic fluids with DIC-rich groundwaters, [ii] pH decrease caused by mixing, [iii] degassing of CO₂ from the mixed waters. The second model involves chemical weathering with an active role of water saturated with DIC of biological origin. The presented models indicate convergent conclusion, that the sources of carbon in carbonates from the Paleogene and Neogene Silesian basaltoids and their ultramafic xenoliths were probably of contaminant [external] origin.

Słowa kluczowe

bazaltoidy badania izotopowe węglany rozproszone węgiel tlen

basaltoids ultramafic xenoliths carbon isotopes isotope fractionation factor alfa

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Przegląd Geologiczny

Rocznik

2004

Tom

Vol. 52, nr 11

Strony

1043--1050

Opis fizyczny

Bibliogr. 44 poz., rys., tab., wykr.

Twórcy

autor

Szynkiewicz A.

szyna@ing.uni.wroc.pl

Pracownia Geologii Izotopowej i Geoekologii, Instytut Nauk Geologicznych, ul. Cybulskiego 30, 50-204 Wrocław

autor

Górka M.

gurcyt@ing.uni.wroc.pl

Pracownia Geologii Izotopowej i Geoekologii, Instytut Nauk Geologicznych, ul. Cybulskiego 30, 50-204 Wrocław

autor

Jędrysek M. O.

morion@ing.uni.wroc.pl

Pracownia Geologii Izotopowej i Geoekologii, Instytut Nauk Geologicznych, ul. Cybulskiego 30, 50-204 Wrocław

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Bibliografia

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bwmeta1.element.baztech-article-BUS3-0024-0016