Computer Science
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icbg.conf...67s&link_type=abstract
Impact Cratering: Bridging the Gap Between Modeling and Observations, p. 67
Computer Science
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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