Local geological sections and regional stratigraphy based on physical geology and chemical stratigraphy of the Serra Geral Group from Araraquara to Avaré, SP

Local geological sections and regional stratigraphy based on physical geology and chemical stratigraphy of the Serra Geral Group from Araraquara to Avaré, SP

dc.contributoren-US
dc.contributorpt-BR
dc.creatorFernandes, Amélia João
dc.creatorNegri, Francisco de Assis
dc.creatorAzevedo Sobrinho, José Maria
dc.creatorJanasi, Valdecir de Assis
dc.date2018-06-01
dc.date.accessioned2023-06-19T15:20:51Z
dc.date.available2023-06-19T15:20:51Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/bjg/article/view/12205
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/6692689
dc.descriptionFrom Araraquara to Avaré, in the Serra Geral Group outcropping area, 22 detailed geological sections were elaborated. The stratigraphic relationships and the chemical analysis allowed the identification of seven [P2 O5] basalt classes, all of them pertaining to the Pitanga type, showing a consistent stacking order across the studied region. Thus, each class is considered to correspond to a specific lava flow, allowing a general stratigraphic column to be proposed. Besides the stacking order, the validation of P2 O5 as a tool for lava correlation at great distances was also based on the values obtained from samples collected at different positions in a single flow, and on the remarkable [P2 O5] contrast between adjacent flows. Minimum lateral extensions range from 75 to 185 km, and thickness from 20 to 80 m. Vertical tectonic displacements, which took place in different periods, were inferred from the altitude of specific flows, and also from the Botucatu and Piramboia formations. They are noticeable in a region bounded by EW drainage lineaments, which contains a large area where Piramboia and Botucatu formations crop out, probably due to the tectonic activity causing this region to be a generalized structural high.en-US
dc.descriptionFrom Araraquara to Avaré, in the Serra Geral Group outcropping area, 22 detailed geological sections were elaborated. The stratigraphic relationships and the chemical analysis allowed the identification of seven [P2 O5] basalt classes, all of them pertaining to the Pitanga type, showing a consistent stacking order across the studied region. Thus, each class is considered to correspond to a specific lava flow, allowing a general stratigraphic column to be proposed. Besides the stacking order, the validation of P2 O5 as a tool for lava correlation at great distances was also based on the values obtained from samples collected at different positions in a single flow, and on the remarkable [P2 O5] contrast between adjacent flows. Minimum lateral extensions range from 75 to 185 km, and thickness from 20 to 80 m. Vertical tectonic displacements, which took place in different periods, were inferred from the altitude of specific flows, and also from the Botucatu and Piramboia formations. They are noticeable in a region bounded by EW drainage lineaments, which contains a large area where Piramboia and Botucatu formations crop out, probably due to the tectonic activity causing this region to be a generalized structural high.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedade Brasileira de Geologiapt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/bjg/article/view/12205/11770
dc.rightsDireitos autorais 2018 Brazilian Journal of Geologypt-BR
dc.sourceBrazilian Journal og Geology; v. 48, n. 2 (2018); 243-261en-US
dc.sourceBrazilian Journal of Geology; v. 48, n. 2 (2018); 243-261pt-BR
dc.source2317-4692
dc.source2317-4889
dc.subjectBasalt; Chemical stratigraphy; Serra Geral Group; São Paulo.en-US
dc.subjectBasalt; Chemical stratigraphy; Serra Geral Group; São Paulo.pt-BR
dc.titleLocal geological sections and regional stratigraphy based on physical geology and chemical stratigraphy of the Serra Geral Group from Araraquara to Avaré, SPen-US
dc.titleLocal geological sections and regional stratigraphy based on physical geology and chemical stratigraphy of the Serra Geral Group from Araraquara to Avaré, SPpt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeen-US
dc.typept-BR


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