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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Lithostratigraphy and volcanology of the Serra Geral Group, Parana-Etendeka Igneous Province in Southern Brazil: Towards a formal stratigraphical framework

Texto completo
Rossetti, Lucas [1, 2] ; Lima, Evandro F. [1] ; Waichel, Breno L. [3] ; Hole, Malcolm J. [2] ; Simoes, Matheus S. [1, 4] ; Scherer, Claiton M. S. [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Fed Rio Grande do Sul, Inst Geociencias, Av Bento Goncalves 9500, Predio 43136, BR-91501970 Porto Alegre, RS - Brazil
[2] Univ Aberdeen, Dept Geol & Petr Geol, Aberdeen AB24 3UE - Scotland
[3] Univ Fed Santa Catarina, Campus Univ Trindade, BR-88040900 Florianopolis, SC - Brazil
[4] Geol Survey Brazil, Serv Geol Brasil, CPRM, Av Andre Araujo 2160, BR-69060000 Manaus, AM - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Citações Web of Science: 10

The volcanic rocks of the Lower Cretaceous Parana-Etendeka Igneous Province, in Brazil, are grouped in the Serra Geral Group. The province can be chemically divided into low-TiO2, and high-TiO2. In southern Brazil, the low-TiO2 lava pile reaches a thickness of similar to 1 km and is formed of heterogeneous lava packages here divided into four lava formations. Torres Formation (TF) is characterized by chemically more primitive basaltic (>5 wt% MgO) compound pahoehoe flow fields; these lavas stratigraphically overly aeolian sandstones of Botucatu Formation and represent the onset of the volcanic activity. Vale do Sol Formation (VSF) groups vertically stacked sheet-like rubbly pahoehoe basaltic andesites (SiO2 > 51 wt%; MgO < 5 wt%). These lavas covered the former basalts in the Torres Syncline axis and pinch out towards southwest and represent the most voluminous mafic lava flows. Dacites and rhyolites of Palmas Formation (PF) overlay VSF flows in the central and eastern outcrop area and rest directly upon TF lavas in the west. The acidic units were emplaced as lava domes and widespread tabular lava flows. Esmeralda Formation (EF) is the upper stratigraphic unit and it is formed by a basaltic pahoehoe flow field emplaced during the waning phase of volcanic activity of the low-TiO2 lava sequence. Sedimentary inter beds are preserved throughout the whole lava pile and were deposited during quiescence periods of volcanic activity, and represent important stratigraphic markers (e.g. TF-VSF contact). The newly proposed stratigraphy provides promptly recognized stratigraphic units in a regional framework of fundamental importance for future correlations and provide vital information in the understanding of how the Parana-Etendeka Igneous Province evolved through time. (C) 2017 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 12/06082-6 - A província magmática Paraná-Etendeka no Brasil: relações temporais e petrológicas entre o magmatismo toleítico e alcalino e suas implicações geodinâmicas
Beneficiário:Excelso Ruberti
Linha de fomento: Auxílio à Pesquisa - Temático