e...@meteoritesusa.com skrev 2012-01-18 20:23:
Sorry if this seems an elementary question. Are heat affected zones in
meteorites caused during atmospheric entry/ablation?
Yes, it is heating from the molten surface that is conducted into the
meteorite. The depth is depending on temperature, time and heat
conduction of the meteorite.
Does this stone appear to have a heat affected zone?
http://www.facebook.com/photo.php?fbid=2546227454530&set=a.2546225014469.2117331.1219094173
No, to me it looks like a weathering zone. Rocks have a higher
insulating factor than irons so the heated zone is a lot thinner.
Weathering will depend on the porosity of the stone and can penetrate
quite deep under the surface creating a colored zone.
In iron meteorites the zone could be easily spotted as the Widmanstätten
pattern is destroyed by heat.
Regards,
Eric
Regards, Göran
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