Back to Search
Start Over
Bouguer anomaly inversion and hydrocode modeling of the central uplift of the Araguainha impact structure
- Source :
- Anais da Academia Brasileira de Ciências, Vol 93, Iss suppl 4 (2021)
- Publication Year :
- 2021
- Publisher :
- Academia Brasileira de Ciências, 2021.
-
Abstract
- Abstract Araguainha is a mid-sized complex impact structure formed in sedimentary and underlying basement rocks of the Paraná 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 ~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 ~2 km.
- Subjects :
- 3D density model
Araguainha impact structure
gravimetry
impact crater
Science
Subjects
Details
- Language :
- English
- ISSN :
- 16782690 and 00013765
- Volume :
- 93
- Issue :
- suppl 4
- Database :
- Directory of Open Access Journals
- Journal :
- Anais da Academia Brasileira de Ciências
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.288a86115d742a4bc7cfe3caf724937
- Document Type :
- article
- Full Text :
- https://doi.org/10.1590/0001-3765202120210081