NDLI: Numerical Modelling of Serra da Cangalha Impact Structure: Preliminary Analysis

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Numerical Modelling of Serra da Cangalha Impact Structure: Preliminary Analysis

Content Provider	Semantic Scholar
Author	Vasconcelos, Marcos Alberto Rodrigues Wünnemann, Kai Crósta, Alvaro Penteado Reimold, Wolf Uwe
Copyright Year	2011
Abstract	ANALYSIS. M.A.R. Vasconcelos 1 , K. Wünnemann 2 , A.P.Crósta 1 , and W.U.Reimold 2 , 1 Institute of Geosciences, University of Campinas, Campinas, SP, Brazil (vasconcelos@ige.unicamp.br,), 2 Museum für Naturkunde, Leibniz Institute at the Humboldt-Universität Berlin, Berlin, Germany (kai.wuennemann@mfn-berlin.de). Introduction: The Serra da Cangalha (SdC) impact structure, centered at 8 o 04'S/46 o 51'W, is a complex impact structure that is ~13-km in diameter and has a 5.8 km diameter central uplift. It is located in Tocantins state, northeastern Brazil and is formed in Phanerozoic sedimentary rocks of the Parnaíba Basin. The basin was developed over a Cambro-Ordovician rift system, and its sedimentary record comprises Silurian, Devonian and Carboniferous-Triassic sequences. The central uplift at SdC consists of a pronounced collar that rises up to 350 meters above the surrounding terrain and a depression at the innermost 1.5 km that is interpreted as an erosion feature [1]. The periphery of the central uplift has been affected by erosional processes that make it appear more subdued than the collar of the central uplift, although still morphologically prominent as shown by satellite imagery (Fig. 1,2). 2D numerical modeling of a vertical impact has been employed to attempt to quantify under what conditions the observed surface expression and crater morphometry (e.g. depth-diameter relationship, stratrigraphic uplift) may have been formed. In order to obtain a model that reproduces the geological information available for the SdC impact structure best, we carried out a series of 160 cratering simulations using the iSALE code [e.g. 2,3] and varied impact energy, the mechanical properties of the different lithological units, and the amount of erosion.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.lpi.usra.edu/meetings/lpsc2011/pdf/1046.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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