Structural Analysis and 3D-kinematic modelling of the Sudbury Impact Structure, Canada

The 1.85 Ga Sudbury Impact Structure, located in the Canadian Shield of Ontario, was affected by orogenic deformation that led to shortening of the Structure by large-scale thrusting and non-cylindrical folding. Knowledge of the effects of post-impact deformation is paramount for assessing the structural evolution of the Sudbury Igneous Complex (SIC), the solidified impact melt sheet of the Structure. Unravelling the geometry of the SIC is one of the prime targets of deep drilling under the umbrella of ICDP. To date, neither impact nor orogenic models account for the steep lower contact of the SIC in the East Range. Thus, field work of the second phase of the project will constrain the states of strains in the SIC, its thermal aureole and underlying Archean basement rocks of this Range. More specifically, the study is aimed at generating structural maps showing the distribution, orientation and type of planar and linear mineral fabrics. These structural characteristics will be compared with those resulting from analogue modelling in viscous materials at the University of Toronto. Furthermore, the distribution and intensity of pseudotachylitic breccia bodies will be mapped in order to differentiate between shock-induced and frictional melt origins of pseudotachylite formation and consequently the nature of structural rings of the Impact Structure.

Riller, Ulrich Prof. Dr. (Details) (Impaktgeologie (J) (hist.))

Projektstart: 05/2005
Projektende: 01/2006

Zuletzt aktualisiert 2020-09-03 um 23:07