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Adventureinfinland. Impactite is rock created or modified by one or more impacts of a meteorite.^[1][2] Impactites are considered metamorphic rock, because their source materials were modified by the heat and pressure of the impact.^[3] On Earth, impactites are made primarily of modified terrestrial material, sometimes with pieces of the original meteorite.^[3]

Creation[edit]

When a large meteorite hits a planet, it can radically deform the rocks and regolith that it hits. The heat, pressure, and shock of the impact changes these materials into impactite.^[3] Only very massive impacts generate the heat and pressure needed to transform a rock, so impactites are created rarely.^[3]

Characteristics[edit]

Impactite includes shock-metamorphosed target rocks, melts (suevites) and mixtures of the two, as well as sedimentary rocks with significant impact-derived components (shocked mineral grains, tektites, anomalous geochemical signatures, etc.). In June 2015, NASA reported that impact glass has been detected on the planet Mars. Such material may contain preserved signs of ancient life—if life existed.^[4] Impactites are generally classified into three groups: shocked rocks, impact melt, and impact breccias.^[2] Mock assembly.com draft simulator.

Shocked rock[edit]

These have been transformed by the shock of the impact.

Impact melts[edit]

When a meteor strikes a planet's surface, the energy release from the impact can melt rock and soil into a liquid. The liquid then cools and becomes an impact melt.^[2] If the liquid cools and hardens quickly into a solid, impact glass forms before the atoms have time to arrange into a crystal lattice. Impact glass can be dark brown, almost black, and partly transparent.^[5] Sometimes, the cooled liquid does form a crystal structure. In that case, it would still be considered an impact melt, but not an impact glass.^[2]

Impact breccias[edit]

Oxford^{[clarification needed]} defines breccias as “a rock consisting of angular fragments cemented together.” An impact breccia is formed when a meteor shatters a rock and then cements it back together. Some breccias contain impact melts.^[3]

Examples of impactite[edit]

Dialectical behavioral therapy certification. Impactite has been found, for example, at the following impact craters:

• Alamo bolide impact (Late Devonian) of Nevada
• Alga crater on the planet Mars^[4]
• Barringer crater, Arizona.^[6]
• Charlevoix crater of Québec
• Darwin Crater from Tasmania (source of Darwin glass)
• Lake Lappajärvi, Finland (source of Kärnäite)
• Manicouagan crater of Québec
• Neugrund crater of Estonia
• Nördlinger Ries crater, Germany
• Rochechouart crater, France
• Stac Fada Member, Scotland
• Wabar craters, Saudi Arabia

See also[edit]

References[edit]

IMPACT: Manual Therapy Certification Program

1. ^Stöffler, D.; Grieve, R.A.F. (1994). 'Classification and Nomenclature of Impact Metamorphic Rocks: A Proposal to the IUGS Subcommission on the Systematics of Metamorphic Rocks'. Lunar and Planetary Science Conference: 1347. Bibcode:1994LPI..25.1347S.
2. ^ ^abcdSchmid, Rolf; Fettes, Douglas; Harte, Ben; Davis, Eleutheria; Desmons, Jacqueline; Smulikowski, Witold; Sassi, Francesco; Brodie, Kate; Árkai, Péter (2007), Fettes, Douglas; Desmons, Jacqueline (eds.), 'Classification and nomenclature scheme', Metamorphic Rocks, Cambridge University Press, pp. 3–110, doi:10.1017/cbo9780511628917.003, ISBN978-0-511-62891-7
3. ^ ^abcde'Impactites: Impact Breccia, Tektites, Moldavites, Shattercones'. geology.com. Retrieved 2020-06-10.
4. ^ ^abcStaff (8 June 2015). 'PIA19673: Spectral Signals Indicating Impact Glass on Mars'. NASA. Retrieved 8 June 2015.
5. ^Temming, Maria. 'Exotic Glass Could Help Unravel Mysteries of Mars'. Retrieved 2015-06-15.
6. ^Meteor Crater Bomblets

External links[edit]

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