"extensive aqueous alteration on the R parent body" Water in space? That sounds like a whole new subject! : )
Thanks, Tom peregrineflier <>< ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, May 31, 2005 11:48 AM Subject: [meteorite-list] R Chondrites and Magnetism > Tom concluded: > > > So, most R's have enough metal to be > > attracted to a powerful enough magnet > > Careful, please. I'd like to add the little word "just", > leave out the word "most" and replace it by "some": > > > Some R's have j u s t enough metal to be > > attracted to a powerful enough magnet ... > > This sounds better because almost all the iron is oxidized and > also FeNi (nickel-iron) is extremely rare (only some tens of parts > per million!) > > In his Cambridge Encyclopedia, O.R. Norton writes on p. 116: > > "There is almost no free iron metal (a few grains here and there) ..." > > > ... if I can find out why R's have so little metal. > > Oxidation (water was the oxidizing agent): > > Step 1: extensive aqueous alteration on the R parent body > Step 2: dehydration (removal of water) + thermal metamorphism > > > Best wishes, > > Bernd > > ______________________________________________ > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.322 / Virus Database: 267.3.2 - Release Date: 5/31/2005 > > ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
