Mechanisms of In Situ Rock Displacement During Hypervelocity Impact: Field and Microscopic Observations

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Displacement, Rocks, Hypervelocity Impact, Impact Melts, Deformation, Microscopy, Melting, Igneous Rocks, Friction, Fracturing

Scientific paper

The nature of rock deformation due to hypervelocity impact is discussed, especially with regard to the larger terrestrial structures (e.g., Sudbury, Vredefort, Manicouagan). Based on field observations and thin section microscopy, evidence is presented for two end-members of rock response to extreme strain rates: (1) bulk deformation, due to pervasive fracture generation and ensuing micro-displacement with melting; (2) localized large-displacement faulting, accompanied by friction melt generation (pseudotachylytes). There is no evidence for bulk "fluidization" at the thin section scale, except where bulk melting has occurred during impact melt sheet generation, wherein truly fluid (igneous) rocks are formed.

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