Réunion scientifique du 16 Novembre 2001

Les isotopes stables, outils pour la détermination de l’alimentation consommée par les animaux
Hervé BOCHERENS (ISEM- Paléontologie, Montpellier)

The scale problem in measuring stable isotopes by different techniques
An example by sulfide S-isotopes from the Witwatersrand Basin, South Africa
Pier A. de GROOT (Commission Européenne, Centre Commun de Recherche,
Institute for Reference Materials and Measurements (IRMM), Retieseweg, B-2440 Geel, Belgique)

Résumé :

Increasingly, techniques requiring smaller sample sizes are used for isotopic analysis. Comparing data obtained by different techniques, using different scale of samples, might cause serious problems. Interpretation with these different data may lead to completely contradicting results. An example, based on measurement of sulfur isotopes on sulfides (pyrites) from a number of gold bearing reefs from the Witwatersrand Basin, South Africa, using classical combustion and modern SIMS techniques, will provide clear evidence to demonstrate contradictory interpretations of sulfur isotope data from the same reefs.

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