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Fig. 2


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Diagramme isochrone Rb-Sr pour les pisolites analysés. Un calcul simple par régression linéaire donne un « âge » de 145 Ma et un rapport 87Sr/86Sr initial de 0,71.

Rb-Sr isochron diagram for the analyzed pisoids. An “age” of 145 My with an initial 87Sr/86Sr ratio of 0.71 can be derived by a simple linear regression calculation.

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