[meteorite-list] Heat affected zone?
From: Göran Axelsson <axelsson_at_meteoritecentral.com>
Date: Thu, 19 Jan 2012 01:04:40 +0100 Message-ID: <4F175E18.5080409_at_acc.umu.se> eric at 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 Widmanst?tten pattern is destroyed by heat. > Regards, > Eric Regards, G?ran Received on Wed 18 Jan 2012 07:04:40 PM PST |
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