Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
Abstract The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic seq...
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Academia Brasileira de Ciências
2020-03-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300601&tlng=en |
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| author | SUSANA BENITES CARLOS A. SOMMER EVANDRO F. DE LIMA JAIRO F. SAVIAN MAURICIO B. HAAG THIAGO R. MONCINHATTO RICARDO I.F. DA TRINDADE |
| author_facet | SUSANA BENITES CARLOS A. SOMMER EVANDRO F. DE LIMA JAIRO F. SAVIAN MAURICIO B. HAAG THIAGO R. MONCINHATTO RICARDO I.F. DA TRINDADE |
| author_sort | SUSANA BENITES |
| collection | DOAJ |
| description | Abstract The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were first identified using remote sensing and then correlated with flow structures observed in the field, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic flow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identified in the studied rocks. Our data shows that Units I and II correspond to silicic lava flows linked to effusive fissure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures. |
| first_indexed | 2024-04-11T17:03:21Z |
| format | Article |
| id | doaj.art-18ee914f0f7c40e292f12159dd9a8f66 |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-04-11T17:03:21Z |
| publishDate | 2020-03-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-18ee914f0f7c40e292f12159dd9a8f662022-12-22T04:13:07ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902020-03-0192210.1590/0001-3765202020180981Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern BrazilSUSANA BENITEShttps://orcid.org/0000-0002-4668-4239CARLOS A. SOMMERhttps://orcid.org/0000-0001-8696-7084EVANDRO F. DE LIMAhttps://orcid.org/0000-0002-4101-3161JAIRO F. SAVIANhttps://orcid.org/0000-0002-5032-3217MAURICIO B. HAAGhttps://orcid.org/0000-0001-5038-4418THIAGO R. MONCINHATTOhttps://orcid.org/0000-0003-3458-0560RICARDO I.F. DA TRINDADEhttps://orcid.org/0000-0001-9848-9550Abstract The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were first identified using remote sensing and then correlated with flow structures observed in the field, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic flow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identified in the studied rocks. Our data shows that Units I and II correspond to silicic lava flows linked to effusive fissure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300601&tlng=enAnisotropy of Magnetic Susceptibilityimage processingsilicic lavasvolcanic morphologies |
| spellingShingle | SUSANA BENITES CARLOS A. SOMMER EVANDRO F. DE LIMA JAIRO F. SAVIAN MAURICIO B. HAAG THIAGO R. MONCINHATTO RICARDO I.F. DA TRINDADE Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil Anais da Academia Brasileira de Ciências Anisotropy of Magnetic Susceptibility image processing silicic lavas volcanic morphologies |
| title | Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
| title_full | Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
| title_fullStr | Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
| title_full_unstemmed | Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
| title_short | Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil |
| title_sort | characterization of volcanic structures associated to the silicic magmatism of the parana etendeka province in the aparados da serra region southern brazil |
| topic | Anisotropy of Magnetic Susceptibility image processing silicic lavas volcanic morphologies |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300601&tlng=en |
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