Etude systématique des isotopes de l'oxygène,du carbone et du strontium dans les carbonatites |
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| Authors: | Françoise Pineau Marc Javoy Claude J Allegre |
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| Institution: | Université de Paris VI, Groupe de Recherches Géochimiques Louis Barrabé, Institut de Physique du Globe, 11, Quai Saint Bernard Paris 6, France |
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| Abstract: | , and ratios have been measured on the same samples for carbonatite complexes. The results show that besides the ‘carbonatite box’ of Tayloret al. (1967) there exist higher δ18O and δ13C values than can be explained by late magmatic or deuteric processes. These processes correspond to high concentrations of CO2 and lead to big enrichments in 18O and 13C as well as in some ‘volatile’ elements. Strontium results are consistent with a model of selective contamination of deep-seated material by highly radiogenic strontium. The whole study leads to the opinion that parent magmas of carbonatites differentiated in a crustal environment with or without significant contamination. |
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