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TitleImpact melting in sedimentary target rocks: an assessment
 
AuthorOsinski, G R; Spray, J G; Grieve, R A F
SourceThe 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
Year2008
Alt SeriesEarth Sciences Sector, Contribution Series 2006519
Alt SeriesUniversity of New Brunswick, Planetary and Space Science Centre, Contribution 54
PublisherGeological Society of America
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 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
AreaWorld
Lat/Long WENS-180.0000 180.0000 90.0000 -90.0000
Subjectsextraterrestrial geology; igneous and metamorphic petrology; sedimentary rocks; carbonates; carbonate rocks; sulphates; evaporites; clastics; meteorites; meteorite craters; thermodynamics; metamorphism, shock
Illustrationsphase diagrams; images; photomicrographs
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramCanadian Space Agency, Funding Program
AbstractDespite 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 ID223182

 
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