
																
																	Petrology, geochemistry and U-Pb zircon and baddeleyite ages of the alkaline rocks from the central-southern Guyana Shield, northern Amazonian Craton
																
																
																
															Keywords: Amazonian craton; Zircon and baddeleyite ages; Mesozoic alkaline magmatism; Phonolites; Syenites; Tacutu basin;