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• W2260565736 abstract "INTRODUCTION The Neoproterozoic evolution of Borborema Province, Northeast Brazil, was characterized by an intense granitic magmatism, associated with a network of continental-scale transcurrent ductile shear zone (Vauchez et al., 1995). Van Schmus et al. (1995, 1997) using U-Pb and Sm-Nd data, subdivided the Borborema Province in three tectonic domains: Northern, Central and Southern, which have shown contrasting isotopic characteristics The Central Tectonic Domain (CTD), region located betwen the continental shear zones Patos and Pernambuco, had affected by at least three thermotectonic events: Paleoproterozoic event (Transamazonian Orogeny, 2.2 to 1.8 G. a), Mesoproterozoic event (Cariris Velhos Orogeny, 1.0 to 0.9 G.a.) and Neoproterozoic event (Brasiliano Orogeny, 0.85 to 0.58 G. a), this last event was responsible for the intense magmatism which characterized Borborema Province. Santos (1996, 1999) subdivided the Borborema Province in tectono-stratigraphic terrains, with distinctive stratigraphic, structural and petrologic features. The Central Tectonic Domain (CTD) was separated in five parts: West Gneissic Terrain (WGT), Pianco-Alto Brigida Terrain (PABT), Alto Pajeu Terrain (APT), Alto Moxoto Terrain (AMT), Rio Capibaribe Terrain (RCT). In the Alto Pajeu Terrain (APT), the magmatism was related at least to two orogenies (Cariris Velhos and Brasiliano events). The first event is characterized by low-angle structures, associated with low angle kinematics, wherever the last event is characterized for shearing structures, associated to an transcurrent kinematics. Almeida et al. (1967) recognized four types of granitoids: Conceicao type (granodiorites and tonalites, medium to fine grained), Itaporanga type (granodiorites with large phenocrystals of K-feldspar), Itapetim type (biotite fine grained granites, associated to Itaporanga type) and Catingueira type (peralkaline granites, syenites and quartz-syenites. Sial (1986) identified four granitoids types in the Pianco-Alto Brigida Terrain: calcalkalic (Conceicao type), potassic-calcalkalic (Itaporanga type), peralkalic (Catingueira type) and trondhjemitic affinities (Serrita type). Taking in consideration the crystallization age and geochemical characteristics, using U-Pb zircon and SmNd data, Guimaraes et al. (1999) divided the CTD granitoids into five groups: calc-alkaline granitoids (including the Conceicao type and some Itaporanga type granitoids), which are examples the Tabira, Itapetim and Timbauba Complexes; high-K metaluminous calcalkaline granitoids (Itaporanga type granitoids), including the Fazenda Nova, Campina Grande and Esperanca Complexes; syenites, quartz-syenites and syenogranites of shoshonitic affinities, including Bom Jardim, Toritama and Pajeu Complexes; monzogranites, syenogranites and syenites, including the Solidao, the east part of Teixeira, Queimadas, Triunfo and Serra Branca Complexes; and biotite syenogranites coarse to medium grained, equigranular to slightly porphiritic (Prata Complex, Pereiro, Serra do Velho Zuza, Serra da Engabelada and Serrote Santo Antonio plutons)." @default.
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• W2260565736 date "2003-01-01" @default.
• W2260565736 modified "2023-09-27" @default.
• W2260565736 title "Rb-Sr AND Sm-Nd ISOTOPE GEOCHEMISTRY OF GRANITOIDS FROM ESPERANÇA GRANITIC COMPLEX, PARAÍBA STATE, BORBOREMA PROVINCE, NORTHEAST BRAZIL" @default.
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