The Sudbury Structure, central Ontario, is the remnant of a large cryptoexplosion structure whose oval map pattern (diameter ratio 2.2) differs markedly from the circular outline of many meteorite impact craters. Finite-element modelling shows that (i) the original northwest-southeast dimension could have been 2-3 times larger than at present and (ii) the vertical dimension of the Sudbury Structure was >10 km before tectonic deformation. Although our structural analyses furnish data that govern the geometric modelling, large uncertainties remain where the state of tectonic deformation is poorly constrained. A series of two-dimensional models was made to cope with kinematic uncertainties and to assess their effect on the estimates of the geometry of the original Sudbury Structure.La structure de Sudbury, situCe dans la partie centrale de I'Ontario, est la cicatrice d'une importante structure de cryptoexplosion, reprCsentCe sur la carte geologique par une forme ovale (rapport des diamktres 2,2) qui differe du pCrim2tre circulaire de la majorit6 des cratkres d'impact mktkoritique. La modClisation par ClCments finis montre que (i) initialement la longueur nord-ouest -sud-est Ctait probablement 2-3 fois plus grande que celle actuelle et (ii) qu'avant la dkformation tectonique la dimension verticale de la structure de Sudbury Ctait supkrieure B 10 km. M&me si les donnCes qui ont servi B la modClisation gComCtrique proviennent de nos mesures structurales, les incertitudes demeurent nombreuses dans les zones oii les dCformations tectoniques sont ma1 dCfinies. Une sCrie de modkles bidimensionnels a Ct C ClaborCe dans le but de rksoudre le problkme des incertitudes tectoniques et d'tvaluer leur effet sur les dimensions initiales de la gtomBtrie de la structure de Sudbury . [Traduit par la rCdaction]Can.
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