Etude systématique des isotopes de l'oxygène, du carbone et du strontium dans les carbonatites

Details Etude systématique des isotopes de l'oxygène, du carbone et du strontium dans les carbonatites Etude systématique des isotopes de l'oxygène, du carbone et du strontium dans les carbonatites

Nov 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2363p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 11, pp.2363-2377

Computer Science

12

Scientific paper

18 O / 16 O , 13 C / 12 C and 87 Sr / 86 Sr ratios have been measured on the same samples for carbonatite complexes. The results show that besides the `carbonatite box' of et al. (1967) there exist higher 18 O and 13 C values than can be explained by late magmatic or deuteric processes. These processes correspond to high concentrations of CO 2 and lead to big enrichments in 18 O and 13 C 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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