Fluid inclusion and carbon isotope study from bamble granulites (South Norway) |
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| Authors: | J Hoefs J Touret |
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| Institution: | 1. Geochemisches Institut der Universit?t G?ttingen, Germany
2. Departement de Pétrographie, Muséum d'Histoire Naturelle, Paris, France
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| Abstract: | The carbon isotopic composition of CO2 from fluid inclusions in granulite facies rocks has been determined. The “primary” carbonic fluid — most probably being of Upper Mantle origin — appears to have δ 13C-values around ?15%. or even lighter up to ?20%. During the late stages of retromorphosis an enrichment in the heavy carbon isotope seems to occur resulting in δ-values between ?5 and ?7%. which, on the basis of 13C/12C ratios of carbonatites, kimberlites and diamonds have been taken up till now as representative for juvenile carbon. The implications of these findings are discussed. |
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