19 documents found, page 1 of 2
Geoconservação em patrimônios espeleológicos da Amazônia: proposta de planejame...
Freire, Luciana Martins; Silva, Edson Vicente da; Veríssimo, César Ulisses Vieira; Lima, Joselito Santiago deThe Amazon region is rich in geomorphological features as result of systemic interaction of nature elements, we can point out the speleological patrimony. The Speleology is an area of study that is dedicated to investigating the nature, genesis and formation processes of natural underground cavities (which include different denominations such as caves, shelters, etc..) and their related features, including even...
Geotecnologias aplicadas ao diagnóstico geoambiental da bacia hidrográfica do r...
Gomes, Daniel Dantas Moreira; Medeiros, Cleyber Nascimento de; Albuquerque, Emanuel Lindemberg Silva; Duarte, Cynthia RomarizThe Jaibaras River Basin, in the State of the Ceara, Brazil, presents an expressive landscape diversity, with a view that is located in a semi-arid region, which contrasts with the mountain landscape of the sub-humid Meruoca and Ibiapaba plateau. The objective of this paper is evaluate, with aid of the techniques of geomatic, the environmental systems in the Jaibaras river Basin, based on the systematization an...
Comparação de Imagens OLI/Landsat-8 e MSI/Sentinel-2 no mapeamento de cobertura...
Freires, Eduardo Viana; Silva Neto, Cláudio Ângelo da; Cunha, Dominick Sávio Rocha; Duarte, Cynthia Romariz; Veríssimo, César Ulisses VieiraOrbital images of the Landsat series have been systematically employed in the mapping of land cover and use. However, some areas, due to the relief characteristics or the strong antropic influence, impose difficulties in this characterization. The Uruburetama massif, in the state of Ceará, represents an area with such peculiarities. This work compares images of the OLI / Landsat-8 and MSI / Sentinel-2 orbital s...
Weathering conditions evaluation of banded iron formations of Bonito Mine (Nort...
Fonteles, Helano Regis da Nóbrega; Pereira, Henrique Garcia; Veríssimo, César Ulisses VieiraThis research was focused on weathering conditions regarding Banded Iron Formations (BIF) ore exploitation at Bonito Mine. The database is stemmed from an exhaustive drilling program at the mining site. Therefore, hundreds of iron ore samples were assayed for Fe2O3, SiO2, Al2O3, P and Mn grades, and qualitative geotechnical data such as weathering grades, physical ore type, voids, and coring depth levels were c...
Petrografia e litoquímica das formações ferríferas bandadas da região de Quixer...
Veríssimo, César Ulisses Vieira; Magini, Christiano; Parente, Clóvis Vaz; Nogueira Neto, José de Araújo; Almeida, Afonso Rodrigues deTwo new occurrences of banded iron formations (BIF’s) had been identified in the regions of Quixeramobim and Boa Viagem, Ceará State. The occurrences are associated to the Neoarchean to Paleoproterozoic rocks of the Cruzeta Complex, whose Sm/Nd - TDM model ages vary between 2,3 and 3,2 Ga. The chemical analyses of major elements in six samples show a relatively simple chemical composition, with SiO 2 and Fe2O3 ...
Vulnerabilidade geoambiental da região metropolitana de Fortaleza: análise comp...
Batista, Clístenes Teixeira; Veríssimo, César Ulisses VieiraThe Metropolitan Region of Fortaleza has a great diversity of environmental components and a substantial increase in recent decades of occupation and land use and exploitation of natural resources by human activities, notably the expansion of urban settlement and mining. This diversity implies environmental different levels of capabilities and limitations of exploiting these areas to human activities. Knowledge...
Geology, petrography and mineral chemistry of iron oxide-apatite occurrences (I...
Parente, Clóvis Vaz; Veríssimo, César Ulisses Vieira; Botelho, Nilson Francisquini; Xavier, Roberto Perez; Menez, Jacqueline; Lino, Ramon de OliveiraIron oxide-apatite (IOA) occurrences have recently been identified in the western sector of the Neoproterozoic Santa Quitéria magmatic arc (Ceará state, northeast Brazil), close to the boundary with the Paleozoic Parnaíba Basin. The IOA mineralization is hosted by albitized metadiorites and metavolcano-sedimentary rocks, which are crosscut by a late- to post-Brasiliano/Pan-African biotite granite intrusion with...
Vestiges of a continental margin ophiolite type in the Novo Oriente region, Bor...
Pitombeira, João Paulo Araújo; Amaral, Wagner da Silva; Uchôa Filho, Evilarde Carvalho; Fuck, Reinhardt Adolfo; Dantas, Elton Luiz; Parente, Clóvis VazThe Novo Oriente Group is a restricted well-preserved metasedimentary sequence, composed of two tectonic-stratigraphic sequences in the southwestern portion of the Cear a Central Domain, NE Brazil. The Bonsucesso Formation comprises mainly quartzite and metamafic rocks and the Caraúbas Formation is dominantly metapelitic, with chemical sedimentary contribution, metamafic and metaultramafic rocks. New integrated...
The Itataia phosphate-uranium deposit (Ceará, Brazil) new petrographic, geochem...
Veríssimo, César Ulisses Vieira; Santos, Roberto Ventura; Parente, Clóvis Vaz; Oliveira, Claudinei Gouveia de; Cavalcanti, José Adilson DiasThe Itataia phosphate-uranium deposit is located in Santa Quiteria, in central Cear a State, northeastern Brazil. Mineralization has occurred in different stages and involves quartz leaching (episyenitization), brecciation and microcrystalline phase formation of concretionary apatite. The last constitutes the main mineral of Itatiaia uranium ore, namely collophane. Collophanite ore occurs in massive bodies, len...
Planejamento ambiental e geoconservação de cavernas da Amazônia
Freire, Luciana Martins; Silva, Edson Vicente da; Veríssimo, César Ulisses VieiraThe Amazon region is rich in geomorphological features as result of systemic interaction of nature elements, we can point out the speleological patrimony. The Speleology is an area of study that is dedicated to investigating the nature, genesis and formation processes of natural underground cavities (which include different denominations such as caves, shelters, etc..) and their related features, including even...