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The geology of the Seychelles Islands in the Indian Ocean is dominated by granitoid rocks and to a lesser extent by basaltic dykes. A U-Pb zircon age from the Takamaka dolerite dyke (Mahe Island) gives an intrusion age of 750.2+/-2.5 Ma. The dyke age is considerably older than previous age estimates and suggests that some of the Mahe dolerite dykes are almost coeval with the granitoid rocks. The Mahe...
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