Formation of Impact Breccias at the Slate Islands Structure, Northern Lake Superior, Ontario, Canada

Details Formation of Impact Breccias at the Slate Islands Structure, Northern Lake Superior, Ontario, Canada Formation of Impact Breccias at the Slate Islands Structure, Northern Lake Superior, Ontario, Canada

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..325d&link_type=abstract

Lunar and Planetary Science, volume 27, page 325

Computer Science

1

Breccia: Impact, Impacts, Slate Islands

Scientific paper

Various types of breccias, shatter cones, impact melts and microscopic shock metamorphic features are common on the Slate Islands (48 degrees 40' N; 87 degrees 00' W) and provide convincing evidence that the structure was formed as the result of comet or asteroid impact. Target rocks consist of three main groups of Archean and Proterozoic supracrustal and intrusive rocks, about 2.7 Ga and 1.8 Ga and 1.1 Ga old respectively. The structure is about 32 km in diameter. Its age is as yet not very well constrained. A large portion of the island group appears to represent the partially eroded central uplift of a complex impact crater. Here we relate specific breccia types in the target rocks to the various phases of the impact process, namely compression (Type A pseudotachylites), central uplift and excavation (clastic matrix breccias), and crater modification (monomict, parautochthonous breccias). Type B pseudotachylites may have formed during the excavation and late crater modification stages. Bunte Breccia and suevite deposits occur on the flanks of the central uplift or on the inner flanks of the annular trough.

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