| 1. Identificação | |
| Tipo de Referência | Artigo em Revista Científica (Journal Article) |
| Site | marte3.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identificador | 6qtX3pFwXQZ3r59YCT/GUMGy |
| Repositório | sid.inpe.br/iris@1905/2005/07.30.00.13 |
| Última Atualização | 2015:11.12.16.55.33 (UTC) marciana |
| Repositório de Metadados | sid.inpe.br/iris@1905/2005/07.30.00.13.49 |
| Última Atualização dos Metadados | 2018:06.06.04.04.06 (UTC) administrator |
| Chave Secundária | INPE-8750-PRE/4483 |
| ISSN | 0102-261X |
| Rótulo | 9669 |
| Chave de Citação | AroraTrViPaRiCh:1999:OvGeDe |
| Título | Overview of Geomagnetic Deep Soundings (GDS) as applied in the Parnaíba Basin, North-Northeast Brazil  |
| Ano | 1999 |
| Data Secundária | 20020326 |
| Data de Acesso | 08 maio 2024 |
| Tipo Secundário | PRE PN |
| Número de Arquivos | 1 |
| Tamanho | 2730 KiB |
| 2. Contextualização | |
| Autor | 1 Arora, B. R. 2 Trivedi, Nalin Babulal 3 Vitorello, Icaro 4 Padilha, Antonio Lopes 5 Rigoti, A 6 Chamalaun, F. H. |
| Grupo | 1 DAE-INPE-MCT-BR |
| Revista | Revista Brasileira de Geofísica |
| Volume | 17 |
| Número | 1 |
| Histórico (UTC) | 2014-09-29 15:13:44 :: administrator -> marciana :: 1999 2015-11-12 16:55:33 :: marciana -> administrator :: 1999 2018-06-06 04:04:06 :: administrator -> marciana :: 1999 |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | concluido |
| Transferível | 1 |
| Tipo do Conteúdo | External Contribution |
| Tipo de Versão | publisher |
| Palavras-Chave | GEOFÍSICA ESPACIAL indução magnética resistividae elétrica geomagnétismo sondagem magnetic induction electrical resistivity geophysics geomagnetism sounding |
| Resumo | Geomagnetic Deep Sounding (GDS) is an electromagnetic method of geophysics, which is capable of imaging the Earth's interior in terms of electrical conductivity using natural geomagnetic transient variations. The method is particularly suited to map geological structures marked by large lateral conductivity contrasts. An overview of the methodology is presented for a magnetometer array study undertaken within and around the intracratonic Parnaíba Basin, north-northeas Brazil. The artical describes the sequential steps of data processing, the results of numerical modeling, and the related geological/tectonic implications of the inferred conductivity distribution. In the initial stages of data processing, an advanced robust regression technique is applied to derive transfer functions used to diagnose the lateral conductivity distribution in the study region. The presentation of the transfer functions in the form of induction arrows helps to identify regions of enhanced conductivity. Contour plots and pseudo-sections of the anomalous vertical fields, estimated from the hypothetical event analysis on transfer functions, are essential to characterize the orientation and dimensionality of the electrical conductive structures of the region. The analysis of various frequency and polarization parameters indicates that an anomalous behavior of the magnetovariational field, with periods longer than one hour, is determined by currents induced in the seawater, and perhaps in the raised asthenosphere beneath the oceanic region. Yet, anomalous signatures observed at periods shorter than one hour are primarily controlled by concentrated currents in two inland conductive structures. They are the Parnaíba Basin Conductivity Anomaly (PBCA), that follows the trend of the Transbrasiliano Lineament in the eastern part of the Parnaíba Basin, and the LINK anomaly, that extends from the central part of the basin to the Marajó Graben. A non-uniform thin sheet modeling has mapped the lateral extent and estimated the depth-integrated conductances of PBCA and LINK to be of the order of 2000 S and 1000 S, respectively. The overall pattern of the inferred conductivity distribution helps to visualize the LINK anomaly as relics of a probable sedimentary channel connecting the Parnaíba Basin and Marajó Graben, and which could have acted as a gateway for sea transgressions during early stages of the basin evolution. The combined inversion and forward modeling of the GDS response functions provides the PBCA structural cross-section as an ensemble of a graben-like structure in the basement and a highly conducting block confined to the deeper central part of the basin, with an embedded resistive body in the middle. The existence of a broad conducting block confined to the central part of the basin is also consistent with magnetotelluric data, and the graben-like structure in the basement is corroborated by aeromagnetic data. The origin of graben-like structures in the basement could be possibly related to an extensional tectonism, whereas the resistive body is tentatively interpreted as a diabase dike or a recrystallized magmatic body intruded during a Cretaceous magmatic event. Carbon bearing sediments are suggested as an alternative to hydrated siliciclastic sediments to account for the high conductivity of the central block. A hydrothermal event associated with the Cretaceous magmatic activity may be the likely process to produce carbon through the pyrolysis of hydrocarbon-saturated Paleozoic sediments. |
| Área | CEA |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDAE > Overview of Geomagnetic... |
| 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/6qtX3pFwXQZ3r59YCT/GUMGy |
| URL dos dados zipados | http://urlib.net/zip/6qtX3pFwXQZ3r59YCT/GUMGy |
| Arquivo Alvo | 1999_arora.pdf |
| Grupo de Usuários | administrator marciana |
| Grupo de Leitores | administrator marciana |
| Visibilidade | shown |
| Política de Arquivamento | allowpublisher allowfinaldraft |
| Permissão de Atualização | não transferida |
| 5. Fontes relacionadas | |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3ETL868 |
| Lista de Itens Citando | sid.inpe.br/bibdigital/2013/09.29.20.43 3 |
| Divulgação | PORTALCAPES; SCIELO. |
| Acervo Hospedeiro | sid.inpe.br/banon/2001/04.03.15.36 |
| 6. Notas | |
| Campos Vazios | affiliation alternatejournal archivist callnumber copyholder copyright creatorhistory descriptionlevel doi e-mailaddress electronicmailaddress format isbn language lineage mark mirrorrepository month nextedition notes orcid pages parameterlist parentrepositories previousedition previouslowerunit progress project readpermission resumeid rightsholder schedulinginformation secondarymark session shorttitle sponsor subject tertiarymark tertiarytype typeofwork url |
| 7. Controle da descrição | |
| e-Mail (login) | marciana |
| atualizar | |