The Algodões Amphibolite-tonalite Gneiss Sequence, Borborema Province, Ne Brazil: Geochemical And Geochronological Evidence For Palaeoproterozoic Accretion Of Oceanic Plateau/back-arc Basalts And Adakitic Plutons

Field relationships, geochemistry and U-Pb zircon and Sm-Nd whole-rock geochronology are used to constrain the genesis of Palaeoproterozoic massive amphibolites and orthogneisses of the Algodões Sequence, Central Ceará Domain, Northeastern Brazil. The 2236 ± 55 Ma-old Algodões amphibolites show trace element geochemical signature and positive εNd(t) values similar to Phanaerozoic oceanic plateau basalts and less often to back-arc basalts. The amphibolites are intruded by tonalitic to quartz-dioritic gneisses of the Cipó unit which were dated at 2160-2170 Ma and 2130 Ma. Neodimium isotope data and whole-rock geochemistry for these gneisses show they are akin to juvenile arc plutonics of the adakitic suite. 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