Evolução petrogenética e tectônica do evento Cariris Velhos na região de Afogados da Ingazeira (PE), terreno Alto Pajeú, Província Borborema

Floresta and Bodocó Mafic–Ultramafic Complexes, western Borborema Province, Brazil: Geochemical and isotope constraints for evolution of a Neoproterozoic arc environment and retro-eclogitic hosted Ti-mineralization

“…Some authors have suggested the development of a back-arc or fore-arc basin adjacent to a subduction zone (Santos, 1995;Kozuch, 2003;Santos et al, 2010;Sales et al, 2011). This theory is supported by the geochemical patterns of non-cumulate metamafic rocks from the FMUC, which are similar to tholeiitic series mixing between arc and MORB/back-arc settings.…”

“…The arc affinity of metasedimentary rocks in the central and north-northeastern parts of the Alto Pajeú Domain is indicated by the geochemical signatures of metamorphosed greywackes, and lithic and arkose sandstones, which are characteristics of derivation from island arc and/or continental arc sources (Sales et al, 2011) and sources mixed with volcanogenic derivatives of mafic and intermediate igneous rocks (Santos, 1995;Kozuch, 2003;Medeiros, 2004;Santos et al, 2010).…”

Os complexos máfico-ultramáficos mineralizados (Fe-Ti±V±Cu±Cr) de Floresta e Bodocó na porção ocidental da Província Borborema e suas implicações geodinâmicas para a evolução da parte oeste da Zona Transversal

“…Arc affinity of metasedimentary rocks in the central and north-northeastern parts of the Alto Pajeú domain is attested by geochemical signatures of metamorphosed greywackes, lithic sandstones, and arkoses characteristic of derivation from a island arc and/or continental arc sources (Sales et al, 2011) and sources mixed with volcanogenic derivates of mafic and intermediate igneous rocks Santos et al, 2010). The chondrite-normalized spiderdiagrams obtained for volcanic rocks of both assemblages in Riacho do Gravatá and from the southwestern part of the Alto Pajeú terrane are somewhat similar to those of medium and high-K calc-alkaline series of continental magmatic arcs .…”

“…The purpose of some authors of a back-arc or fore-arc basin developed as an adjunct to a zone of subduction Sales et al, 2011) is coeval with the geochemical patterns of the non-cumulative metamafic rocks from FMUC similar of a tholeiitic series mixing between arc and MORB/back-arc setting (see bulk-rock chemistry section).…”

Estudo de proveniência em sequências supracrustais neoproterozóicas da Zona Transversal, Província Borborema

“…O Complexo 5äb caetano, como originalmente descrito por Santos (l b71 ) a sul da região de Afogados da lngazeira (PE), compreende uma associação dominantemente metapelltica-psam ítica (paragnaisses com muscovita/biotita) com metagrauvacas, lentes de mármore, quartzitos e cálcio-s¡licát¡cas, além de rochas metavulcânicas associadas. lntrusões tabulares de ortognaisses também são descr¡tas dentro das supracrustais desse complexo (Sales et al,2011). Reconhecendo a impossib¡lidade de distinção de relações l¡toestratigráficas e estruturais conclusivas em escala regional, Medeiros (2004) não diferenciam entre as rochas supracrustais dos complexos Riacho Gravatá e São Caetano, as quais são consideradas como unidade metavulcanossedimentar única mapeada entre as zonas de cisalhamento Serra do Caboclo, a oeste, e Afogados da lngazeira, a leste, a despeito das individ ualização adotacla nas publicações mais recentes sobre o TAP (Van Schmus et al, 2008 Santos et a'1., 2010; Guimarães et'ál::., 2012).…”