On the role of shock melting and anatexis in breccia formation: Southern Sudbury impact structure, Canada

Rounded argillite clasts within the lower Gowganda Formation of the Huronian Supergroup near Whitefish Falls, Ontario, have been historically mapped as Sudbury Breccia, implying their formation was initiated by the Sudbury meteorite impact event. Alternative genetic models proposed to explain the breccia at Whitefish Falls include formation through intrusion of diabase into wet sediment accompanied by soft sediment deformation events. Outcrops in the Whitefish Falls area contain clear evidence for early post depositional fracturing: flow of argillites into brittle fractured sandstones. Linking these geological processes suggests formation of the breccia at Whitefish Falls was generated by faulting of the Huronian sedimentary basin during sedimentation of the Gowganda argillites. Using a GIS approach to compare the distribution of known breccia bodies with mapped lithology and structure it is apparent the term Sudbury Breccia has been applied to two types of breccia. First, true Sudbury Breccia, which is characterised by rounded heterogeneous clasts in an aphanitic matrix, is only found in proximity to the Sudbury Impact crater. Distribution of the second, primarily sediment derived, type of breccia, as seen at Whitefish Falls, is strongly associated with mapped faults and regional scale basement discontinuities, as defined by gravity and magnetic data. Since this type of breccia is present throughout the entire Huronian sedimentary sequence the term “Huronian Breccia” is more appropriate. This breccia is not the result of a single geological event but rather episodes of fault activity, as the geometry of the Huronian basin evolved over time.

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On the role of shock melting and anatexis in breccia formation: Southern Sudbury impact structure, Canada

Cited by 2 publications

References 72 publications

Revising PGE deposition and remobilization mechanisms using new data from the historic Vermilion and Crean Hill mines, Sudbury, Canada

Revising PGE deposition and remobilization mechanisms using new data from the historic Vermilion and Crean Hill mines, Sudbury, Canada

“Sudbury Breccia” and “Huronian Breccia”: spatial, sedimentological, and structural evidence for separate distinct breccia-forming events

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