| 1. Identificação | |
| Tipo de Referência | ePrint (Electronic Source) |
| Site | mtc-m16c.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Repositório | sid.inpe.br/ePrint@80/2006/12.06.10.15 |
| Última Atualização | 2006:12.06.09.15.21 (UTC) administrator |
| Repositório de Metadados | sid.inpe.br/ePrint@80/2006/12.06.10.15.19 |
| Última Atualização dos Metadados | 2018:06.04.04.22.30 (UTC) administrator |
| Chave de Citação | SantosJrAraRos::OrRiCa |
| Título | Origin of the Rio Capim Kaolin with basis on optical (petrographic and SEM) data  |
| Data da Última Atualização | 2006-12-07 |
| Data de Acesso | 12 maio 2024 |
| Tipo de Suporte | On-line |
| Tipo Secundário | PRE PI |
| Número de Arquivos | 1 |
| Tamanho | 56 KiB |
| 2. Contextualização | |
| Autor | 1 Santos Junior, Antonio Emí 2 Araú, dio de 3 jo 4 Rossetti, Dilce de Fá 5 tima |
| Grupo | 1 2 DSR-INPE-MCT-BR |
| Afiliação | 1 UFPA 2 Instituto Nacional de Pesquisas Espaciais (INPE) |
| Endereço de e-Mail do Autor | 1 antonioemidio@yahoo.com.br 2 rossetti@dsr.inpe.br |
| Endereço de e-Mail | rossetti@dsr.inpe.br |
| Produtor | Instituto Nacional de Pesquisas Espaciais |
| Cidade | São José dos Campos |
| Estágio da Publicação Alternativa | submitted |
| Avanço | ePrint update |
| Histórico (UTC) | 2007-03-22 14:39:34 :: rossetti@dsr.inpe.br -> administrator :: 2007-11-28 19:26:18 :: administrator -> rossetti@dsr.inpe.br :: 2008-04-26 01:40:01 :: rossetti@dsr.inpe.br -> administrator :: 2018-06-04 04:22:30 :: administrator -> rossetti@dsr.inpe.br :: |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | em andamento |
| Transferível | 1 |
| Palavras-Chave | Petrology Rio Capim kaolin Cametá Sub-basin kaolinite origin source area |
| Resumo | The Ipixuna Formation (Late Cretaceous-?Early Tertiary) exposed in the Rio Capim area, northern Brazil, was subdivided recently into three stratigraphic horizons, informally known as the lower soft kaolin unit, the intermediate kaolin unit, and the upper, endured, semi-flint kaolin unit. These units had their primary texture and composition strongly modified after deposition. Petrographic and scanning electronic microscopic (SEM) investigation revealed many remaining features that allow distinguishing the soft and the semi-flint kaolin deposits into two depositional sequences. The soft kaolin unit consists of well structured, sub-angular to sub-rounded, and locally angular, kaolinitized quartzose sandstones and kaolinitized sandstones that are interbedded with either laminated or massive pelites. These lithologies, composed by grains and lithic fragments related to felsic volcanic and meta-volcanic sources, as well as metamorphic and granitic rocks, had their texture and composition strongly modified, mostly likely during diagenesis, resulting deposits with an actual wacky nature. Kaolinitization produced three types of kaolinites, categorized according to size and texture, as Ka, Kb and Kc kaolinites. Ka kaolinite, typical of the sandstones, consists of hexagonal to pseudohexagonal crystals 10-30 Ým in diameter, and occurs as agglomerates of booklets or vermicular crystals that reach up to 400 Ým in length. Kb kaolinite, which dominates in the mudstones, consists chiefly of hexagonal and pseudohexagonal crystals averaging 1-3 Ým in diameter that occur isolated, or as intergrowths of chaotic, face-to face or, less commonly, parallel to pseudo-parallel crystals. Kc kaolinite, which is abundant only in association with paleosols, displays hexagonal to pseudohexagonal crystals with regular sizes around 200 nm in diameter. The semi-flint is attributed to a distinctive depositional unit formed by sediments from variable sources, but with a significant contribution from the underlying soft kaolin. This is suggested by a high volume of sandstones displaying grains that are sub-rounded to rounded and consisting of homogeneous, dark brown masses of kaolinite that are strongly highlighted by films of iron oxides. As opposed to the soft kaolin unit, the semi-flint is dominated by endured Kc kaolinite, which mostly likely results from combination of weathering during transportation and pedogenesis acting in several phases of sediment subaerial exposure.. |
| Área | SRE |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDSR > Origin of the... |
| Conteúdo da Pasta doc | acessar |
| Conteúdo da Pasta source | não têm arquivos |
| Conteúdo da Pasta agreement | não têm arquivos |
| 4. Condições de acesso e uso | |
| URL dos dados | http://urlib.net/ibi/sid.inpe.br/ePrint@80/2006/12.06.10.15 |
| URL dos dados zipados | http://urlib.net/zip/sid.inpe.br/ePrint@80/2006/12.06.10.15 |
| Idioma | en |
| Arquivo Alvo | v1.pdf |
| Grupo de Usuários | administrator rossetti@dsr.inpe.br administrator |
| Visibilidade | shown |
| Permissão de Atualização | transferida para ePrint update |
| 5. Fontes relacionadas | |
| Vinculação | Trabalho Vinculado à Tese/Dissertação |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3ER446E |
| Acervo Hospedeiro | sid.inpe.br/mtc-m18@80/2008/03.17.15.17 |
| 6. Notas | |
| Campos Vazios | accessyear alternatepublication archivingpolicy archivist contenttype copyholder copyright creatorhistory descriptionlevel dissemination doi edition format identifier isbn issn label lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit project readergroup readpermission resumeid rightsholder schedulinginformation secondarydate secondarykey secondarymark session shorttitle sponsor subject tertiarytype url versiontype year |
| 7. Controle da descrição | |
| e-Mail (login) | rossetti@dsr.inpe.br |
| atualizar | |