Age, composition, and source of continental arc- and syn-collision granites of the Neoproterozoic Sergipano Belt, Southern Borborema Province, Brazil

摘要: Abstract The Sergipano belt is the outcome of collision between Pernambuco-Alagoas Domain (Massif) and Sao Francisco Craton during Neoproterozoic assembly West Gondwana. Although understanding evolution has improved significantly, timing emplacement, geochemistry tectonic setting granitic bodies in poorly known. We recognized two granite age groups: 630–618 Ma granites Caninde, Poco Redondo Macurure domains, 590–570 Ma metasedimentary domain. U–Pb SHRIMP zircon ages for first group indicated 631 ± 4 Ma Sitios Novos granite, 623 ± 7 Ma 619 ± 3.3 Ma Lajedinho monzodiorite, 618 ± 3 Ma Queimada Grande granodiorite. These granitoids are dominantly high-K calc-alkaline, magnesian, metaluminous, mafic enclave-rich (Queimada Lajedinho), or with abundant inherited grains (Poco Novos). Geochemical isotope data allow us to propose that product partial melting migmatites. Sr-Nd isotopes granodiorite monzodiorite suggest their parental magma may have originated by mixing a juvenile source crustal component could be migmatites metasediments. Other Coronel Joao Sa Camara tonalite sedimentary similar geochemical isotopic characteristics as granitoids. infer magmas had contributions from lower crust felsic upper crust, most probably underthrust Craton, Domain. younger confined these do not show typical features S-type granites, age, field relationships, high degree micaschists. Field observations support model which domain, limited Belo Monte-Jeremoabo Miguel Aleixo shear zones, behaved ductile channel flow migration emplacement Neoproterozoic, very much like proposed leucogranites Himalayas.