| Texto completo | |
| Autor(es): |
Miyazaki, Marcelle R.
[1]
;
Leite, Emilson P.
[1]
;
Vasconcelos, Marcos A. R.
[2]
;
Wunnemann, Kai
[3, 4]
;
Crosta, Alvaro P.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Inst Geociencias, Rua Carlos Gomes 250, BR-13083855 Campinas, SP - Brazil
[2] Univ Fed Bahia, Inst Geociencias, Dept Geofis, Av Adhemar Barros S-N, BR-40170110 Salvador, BA - Brazil
[3] Museum Nat Kunde, Leibniz Inst Evolut & Biodivers Sci, Invalidenstr 43, D-10115 Berlin - Germany
[4] Free Univ Berlin, Malteserstr 74-100, Haus D, D-12249 Berlin - Germany
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Anais da Academia Brasileira de Ciências; v. 93, n. 4 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Araguainha is a mid-sized complex impact structure formed in sedimentary and underlying basement rocks of the Parana Basin, Brazil. The structure has strongly deformed sedimentary strata surrounding a granitic core. The central uplift is a region of high geological complexity, comprising different types of sedimentary, igneous (granite) and metamorphic lithologies, plus breccias and impact melt sheets. New ground gravity data was collected to produce a Bouguer anomaly map and to perform a 3-D inversion in order to obtain a 3-D density model of the central uplift. This 3-D density model is consistent with iSALE numerical modeling results, which shows that the rocks in the innermost portion became brecciated and/or melted after undergoing pressure/temperature peaks. The positive anomaly of Furnas and Ponta Grossa formations associated with the numerical model shows that the central uplift is similar to 16 km wide. Thus, the granite's uplift caused the uplift of the entire stratigraphic package, from its Devonian-aged units to the Permian ones, forming a bull's eye pattern around the granitic core. The results also indicate that Araguainha was formed by a 3 km diameter impactor, and the rocks of the granitic basement rocks were uplifted by similar to 2 km. (AU) | |
| Processo FAPESP: | 12/04191-2 - Modelamento numérico e geofísico de estruturas de impacto brasileiras |
| Beneficiário: | Marcos Alberto Rodrigues Vasconcelos |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 16/16021-5 - Gravimetria e gamaespectrometria da cratera de impacto de Araguainha |
| Beneficiário: | Emilson Pereira Leite |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 12/19726-9 - Modelamento numérico de estruturas de impacto brasileiras |
| Beneficiário: | Marcos Alberto Rodrigues Vasconcelos |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |