| Full text | |
| Author(s): |
Miyazaki, Marcelle R.
[1]
;
Leite, Emilson P.
[1]
;
Vasconcelos, Marcos A. R.
[2]
;
Wunnemann, Kai
[3, 4]
;
Crosta, Alvaro P.
[1]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Anais da Academia Brasileira de Ciências; v. 93, n. 4 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 12/04191-2 - Numerical and geophysical modeling of Brazilian impact structures |
| Grantee: | Marcos Alberto Rodrigues Vasconcelos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/16021-5 - Gravimetry and gamma-ray spectrometry of the Araguainha impact crater |
| Grantee: | Emilson Pereira Leite |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 12/19726-9 - Numerical modelling of Brazilian impact structures |
| Grantee: | Marcos Alberto Rodrigues Vasconcelos |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |