File:Rochechouart-pseudotachylite-Champagnac.jpg

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Rochechouart-pseudotachylite-Champagnac.jpg ‎(800 × 600 pixels, file size: 100 KB, MIME type: image/jpeg)

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Fragment de pseudotachylite du cratère d'impact de Rochechouart (France).

Pseudotachylite (Chapagnac)

Les pseudotachylites sont formées sous l'effet d'un choc extrêmement violent, d'un tremblement de terre, ou encore d'une explosion nucléaire. Les roches du terrain qui subit l'onde de choc se déplacent et l'effet combiné de la pression et de la friction fait fondre les matériaux des fragments en déplacement. Ces matériaux en fusion s'écoulent ensuite dans les anfractuosités de la roche.
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Author Photos : Peter Bockstaller / Retouche : Frédéric Michaud (avec permission, email de confirmation disponible sur demande Frédéric 01:11, 28 March 2007 (UTC))
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current23:12, 28 March 2007Thumbnail for version as of 23:12, 28 March 2007800 × 600 (100 KB)Geneamichaud (talk | contribs){{Information |Description=''Fragment de pseudotachylite du [http://fr.wikipedia.org/wiki/Astrobl%C3%A8me_de_Rochechouart-Chassenon cratère d'impact de Rochechouart] (France).'' '''Pseudotachylite (Chapagnac)''' Les pseudotachylites sont formées sous

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