Ejecta

Encyclopedia : E : EJ : EJE : Ejecta

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In volcanology, ejecta consists of particles that came out of a volcanic vent, traveled though the air or under water, and fell back on the ground surface or on the ocean floor. Ejecta can consist of

1. juvenile particles - (fragmented magma and free crystals)
2. cognate or accessory particles - older volcanic rocks from the same volcano
3. accidental particles - derived from the volcanic basement.

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In planetary geology, ejecta can also refer to the debris that is ejected during the formation of an impact crater.

In astrophysics the term can refer to material expelled in a stellar explosion, like that described in [The Plerionic Supernova Remnant G21.5-0.9: In and Out] or [(a detection by) The Advanced Satellite for Cosmology and Astrophysics (ASCA) http://heasarc.gsfc.nasa.gov/docs/asca/asca2.html]

 

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