Abstract
A Rb-Sr analysis of suites of samples from a small intrusion of cordierite-bearing alkali granite into the peridotite of the Sierra Bermeja (Serrania de Ronda) yields an age of 22± 4 Ma (λ = 1.42×10−11 a−1): Late Oligocene/Early Miocene. It is believed that the intrusion was derived from contact-anatectic melts produced along the hot ultramafic mass during and/or directly following its tangential, tectonic dislocation from a mantle diapir. Its age can thus be taken as dating the termination of the hot emplacement of the ultramafic masses. K-Ar dates of biotites and Rb-Sr dates of biotite/whole-rock pairs in contact-metamorphic wall rocks along the ultramafics mostly lie between 19.5 and 18.5 Ma. This probably indicates that about 19 Ma ago the contact-zones of the ultramafic masses had cooled down to the blocking temperature of biotite to Rb-Sr and K-Ar.
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Priem, H.N.A., Boelrijk, N.A.I.M., Hebeda, E.H. et al. Isotopic dating of the emplacement of the ultramafic masses in the Serrania de Ronda, Southern Spain. Contr. Mineral. and Petrol. 70, 103–109 (1979). https://doi.org/10.1007/BF00371876
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DOI: https://doi.org/10.1007/BF00371876