2011
DOI: 10.1590/s0102-261x2011000100006
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Utilização de imagens aerogamaespectrométricas, Landsat 7 ETM + e aeromagnéticas no estudo do arcabouço crustal da porção central do domínio da zona transversal, província Borborema, NE do Brasil

Abstract: ABSTRACT.In the central portion of the Transversal Zone (Borborema Province, northeastern Brazil), field geological mapping combined with interpretation of airborne gammaspectrometric, magnetic and satellite imagery (Landsat 7 ETM+) data were performed in order to evaluate the importance (especially, continuation at depth) of shear zones as potential candidates to represent terrain boundaries and sutures. This integrated analysis emphasized three deeper structures which separate crustal blocks, including as su… Show more

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Cited by 19 publications
(13 citation statements)
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“…In addition to geochemical arguments, rocks of intermediate composition are absent and the metavolcanic component in the supracrustal sequence is bimodal, which is more akin to an intraplate setting. The main arguments against an early Tonian orogenic event, however, are, first, that there is no evidence for associated metamorphism, such as zircons with low Th/U ratios and discordia lines pointing to Pb loss, as one would expect from a significant orogenic event, and; second, that the fabric of Cariris Velhos-related rocks is the same present in younger rocks (Medeiros et al, 2011;personal observations), therefore showing that it has been produced during the Brasiliano Orogeny. (iv) The presence of early Neoproterozoic detrital zircons in the Northern Subprovince suggests derivation from the southern subprovinces because rocks of these ages are presently unknown in these places.…”
Section: General Considerationsmentioning
confidence: 99%
“…In addition to geochemical arguments, rocks of intermediate composition are absent and the metavolcanic component in the supracrustal sequence is bimodal, which is more akin to an intraplate setting. The main arguments against an early Tonian orogenic event, however, are, first, that there is no evidence for associated metamorphism, such as zircons with low Th/U ratios and discordia lines pointing to Pb loss, as one would expect from a significant orogenic event, and; second, that the fabric of Cariris Velhos-related rocks is the same present in younger rocks (Medeiros et al, 2011;personal observations), therefore showing that it has been produced during the Brasiliano Orogeny. (iv) The presence of early Neoproterozoic detrital zircons in the Northern Subprovince suggests derivation from the southern subprovinces because rocks of these ages are presently unknown in these places.…”
Section: General Considerationsmentioning
confidence: 99%
“…O Terreno Rio Capibaribe (Santos & Medeiros, 1999) (Howell et al 2000), foi reforçada por trabalhos recentes de levantamento geofísico, como Oliveira (2008) e Medeiros et al (2011).…”
Section: Terreno Rio Capibaribeunclassified
“…Ao sul, o limite convencionado é o Lineamento Pernambuco, zona de cisalhamento destral, de direção geral E-W, que separa o TRC dos domínios granítico-migmatíticos do maciço PEAL. Essa delimitação e situação geológica -terreno tectonoestratigráfico, sentido de Howell (2000) -tiveram necessário endosso recente em trabalhos de levantamento geofísico, como os de Oliveira (2008) e Medeiros et al (2011), mas ainda há algumas questões em aberto.…”
Section: Posição Geológico-tectônica E Fisiográficaunclassified
“…Se o esquema de shear zones delimitantes estiver correto -e tiverem a importância consignada por Medeiros et al (2011) -, este terreno funciona de fato como uma fração litosférica em expulsão (extrusão) para leste, em separação (escape) da Zona Transversal da Província Borborema. No pós-Ediacarano, responsável por esta feição/condição, estas zonas de fraqueza crustal foram repetidamente sujeitas a reativações, objeto de muitos estudos específicos.…”
Section: Evolução Geotectônicaunclassified
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