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Composition isotopique du plomb et du soufre des galènes liées aux formations sédimentaires interprétations géologiques et géophysiques

Lead and sulphur isotopic composition of galenas related with sedimentary formations geological and geophysical interpretations

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Abstract

Stratiform deposits found in mesozoic sedimentary layers, in Marocco and in France, have been analysed to determine lead and sulphur isotopic compositions.

For the sulphur, the results indicate a low temperature formation, and are in good agreement with synsedimentary theories. The lead isotopic compositions are anomalous: J type for french galenas, B type for these of Marocco. The authors propose that the lead of these galenas have had a continental origin; the two different histories of the continental areas explain the galena anomalous compositions; two factors are particulary important: the age of the crust formation, and after that, the time of separation of lead from uranium and thorium in the continental crust.

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Lancelot, J., Sarazin, G. & Allegre, C.J. Composition isotopique du plomb et du soufre des galènes liées aux formations sédimentaires interprétations géologiques et géophysiques. Contr. Mineral. and Petrol. 32, 315–333 (1971). https://doi.org/10.1007/BF00373349

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  • DOI: https://doi.org/10.1007/BF00373349

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