<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Stable isotope data for carbon (δ13C) and oxygen (δ18O) are used to constrain the environments of calcite formation in two veins in the El-Seboah peralkaline granite in south-western Egypt. Vein I with calcite-magnetite-goethite-hematite-quartz, and vein II with calcite-magnetite-goethite-kaolinite-hematite-quartz are texturally distinct. The calcite of each vein has characteristic δ13C- and δ18O-values: + 0.32 and -7.28‰ for vein I and + 1.16 and - 1.21‰ for vein II, respectively. The observed differences between the δ13C values of the two veins indicate that they represent two separate systems of primary dissolved inorganic carbon formed at or near equilibrium with atmospheric CO2. The δ18O values, on the other hand, indicate calcite deposition from meteoric waters which were fresh for vein I and brackish for vein II.</abstract>

Stable isotope data for carbon (δ13C) and oxygen (δ18O) are used to constrain the environments of calcite formation in two veins in the El-Seboah peralkaline granite in south-western Egypt. Vein I with calcite-magnetite-goethite-hematite-quartz, and vein II with calcite-magnetite-goethite-kaolinite-hematite-quartz are texturally distinct. The calcite of each vein has characteristic δ13C- and δ18O-values: + 0.32 and -7.28‰ for vein I and + 1.16 and - 1.21‰ for vein II, respectively. The observed differences between the δ13C values of the two veins indicate that they represent two separate systems of primary dissolved inorganic carbon formed at or near equilibrium with atmospheric CO2. The δ18O values, on the other hand, indicate calcite deposition from meteoric waters which were fresh for vein I and brackish for vein II.

Note on the stable isotope values of vein calcite in the El-Seboah peralkaline granite (SW Egypt)

Nuclear Materials Authority, B.O. Box 530, Maadi, Cairo, Egypt

Mineralogia

Stable isotope data for carbon (δ13C) and oxygen (δ18O) are used to constrain the environments of calcite formation in two veins in the El-Seboah peralkaline...

Note on the stable isotope values of vein calcite in the El-Seboah peralkaline granite (SW Egypt)

Publié en ligne: 04 juil. 2012

Pages: 113 - 120

DOI: https://doi.org/10.2478/v10002-011-0010-y

Mots clés
δ13C, δ18O, carbonate-hosting veins, peralkaline granite, Egypt

This content is open access.

Note on the stable isotope values of vein calcite in the El-Seboah peralkaline granite (SW Egypt)

Publié en ligne: 04 juil. 2012

Pages: 113 - 120

DOI: https://doi.org/10.2478/v10002-011-0010-y

Mots clésδ13C, δ18O, carbonate-hosting veins, peralkaline granite, Egypt

This content is open access.

Mots clés
δ13C, δ18O, carbonate-hosting veins, peralkaline granite, Egypt