87Rb-87Sr systematics of a geothermal water-rock association in the Massif Central, France

Details 87Rb-87Sr systematics of a geothermal water-rock association in the Massif Central, France 87Rb-87Sr systematics of a geothermal water-rock association in the Massif Central, France

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..34..432s&link_type=abstract

Earth and Planetary Science Letters, Volume 34, Issue 3, p. 432-438.

Physics

4

Scientific paper

Rb and Sr concentrations and Sr isotopic composition have been measured in thermo-mineral waters from the Massif Central in France. Rocks and mineral fractions which are thought to be important Sr contributors were also analyzed. The results suggest the waters to be mixtures of two or three components from different reservoirs, which can be associated with possible source rock types like granite and syenodiorite occurring in the region. The strontium isotopic ratios found in the separated minerals of the syenodiorite stratum indicate no chemical fractionation during the water-rock interaction. A Rb-Sr internal isochron age of (265 +/- 10) × 106 yr is inferred for the Roche d'Enval syenodiorite. Present address: Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland.

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