| Title | Impact melting in sedimentary target rocks: an assessment |
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| Author | Osinski, G R; Spray, J G; Grieve, R A F |
| Source | The Sedimentary record of meteorite impacts; by Evans, K R (ed.); Wright, J W, Jr (ed.); King, D T, Jr (ed.); Morrow, J R (ed.); Geological Society of America, Special Paper 437, 2008 p. 1-18, https://doi.org/10.1130/2008.2437(01) |
| Image |  |
| Year | 2008 |
| Alt Series | Earth Sciences Sector, Contribution Series 2006519 |
| Alt Series | University of New Brunswick, Planetary and Space Science Centre, Contribution 54 |
| Publisher | Geological Society of America |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada |
| NTS | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Area | World |
| Lat/Long WENS | -180.0000 180.0000 90.0000 -90.0000 |
| Subjects | extraterrestrial geology; igneous and metamorphic petrology; sedimentary rocks; carbonates; carbonate rocks; sulphates; evaporites; clastics; meteorites; meteorite craters; thermodynamics; metamorphism,
shock |
| Illustrations | phase diagrams; images; photomicrographs |
| Program | NSERC Natural Sciences and Engineering Research Council of
Canada |
| Program | Canadian Space Agency, Funding Program |
| Abstract | Despite being present in the target sequence of ~70% of the world's known impact structures, the response of sedimentary rocks to hypervelocity impact remains poorly understood. Of particular
significance is the relative importance and role of impact melting versus decomposition in carbonate and sulfate lithologies. In this work, we review experimental evidence and phase equilibria and synthesize this data with observations from studies
of naturally shocked rocks from several terrestrial impact sites. Shock experiments on carbonates and sulfates currently provide contrasting and ambiguous results. Studies of naturally shocked materials indicate that impact melting is much more
common in sedimentary rocks than previously thought. This is in agreement with the phase relations for calcite. A summary of the criteria for the recognition of impact melts derived from sedimentary rocks is presented, which it is hoped will
stimulate further studies of impact structures in sedimentary target rocks. This assessment leads us to conclude that impact melting is common during hypervelocity impact into crystalline and sedimentary rocks. However, the products are texturally
and chemically distinct, which has led to much confusion in the past, particularly in terms of the recognition of impact melts derived from sedimentary rocks. |
| GEOSCAN ID | 223182 |
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