An isotopic and geochronological investigation of the younger igneous rocks of the Seychelles microcontinent

Rb/Sr and K/Ar dating of the younger igneous rocks of the Seychelles Islands reveals a peak of magmatic activity at 63 Ma. This corresponds very well with the timing of continental rifting between the Seychelles microcontinent and the Indian plate deduced from ocean floor magnetic anomaly patterns.18O/16O,87Sr/86Sr,143Nd/144Nd and Pb isotope compositions of Cretaceous/Tertiary dolerite dykes indicate strong contamination by continental …