so you are meaning bubbles of olivine and metal , or chondrules which are bubbles of solid material, not bubbles of gasses like most people think bubbles are? a good example might be an armored chondrule where you have a heavier ring of metal surrounding silicate lighter material on the inside. instead of a thin layer of soap with gasses on the inside? at temperatures high enough to make the silicates a gas and metal a liquid, the cooling of the metallic bubbles creates chondrules. the same way trapped gasses in ice create spherical bubbles of gasses. you have metals or other material with a higher melting point acting as the thin soap skin of the bubble. and lighter materials cooling from a gas to a solid? or with chondrites the surface tension of the molten material creates spheres or chondrules which could also be described as bubbles. slag would be a good example! as the oxide metal and sulphides cool it creates lots of vesicles of spherical gasses. in space with no gasses the vesicles would become a spherical solid upon cooling. take this with a grain of salt i am only guessing here! Steve Dunklee
--- On Wed, 1/27/10, abu...@nycap.rr.com <abu...@nycap.rr.com> wrote: > From: abu...@nycap.rr.com <abu...@nycap.rr.com> > Subject: [meteorite-list] Regmaglypts > To: meteorite-list@meteoritecentral.com > Date: Wednesday, January 27, 2010, 12:18 PM > My Response Jan 27, 2010 > > Subject: Re: [meteorite-list] Regmaglypts > > Jason and All, > > 1. My reference to “bubbles” is to morphology, > NOT voids. Another meteoritic example of “bubble > morphology effects” is pallasitic olivines such as > Springwater and Imilac. > > A thought experiment: Once again, envision a melt mass of > olivine and nickel-iron solidifying under microgravity > conditions – surface energy dominates gravity. > > On cooling, olivine begins to solidify before nickel-iron. > However, since olivine and iron-nickel share a range of > temperatures where both are still at least partially liquid > (mushy stage), as cooling continues, still-plastic olivines > can be surrounded by and sometimes infiltrated and pushed > apart by liquid nickel-iron. > > Cut and polished sections of Springwater and Imilac reveal > this as a relatively complex process. Observe 120 > angles between some olivines, evidence of a system governed > by surface energy. Some olivine boundaries are > straight (interior polyhedral shapes); some are circular (a > sphere minimizes surface area to volume ratio); some > straight and curved (perhaps on the outer surface of the > olivine mass). See my "Stepping Back in Time" article in > Meteorite magazine Nov. 2003, Vol. 9 No. 4, pp. 21-22 or see > it in the publications list on my website at http://meteormetals.com > > 2. There is NO WAY that the thermal history of a > metal can be calculated in reverse, despite hundreds of > papers in the meteoritics literature since the original > paper of Osmond and Cartaud in 1904 and the more recent, > detailed papers on “metallographic cooling rates!” > That is more than 100 years of circular reasoning! > Industrial metallurgists would be a lot happier if this > backward calculation were possible. It is NOT! > > 3. Speaking of industrial metallurgists, do another > experiment: show a cut section of any nickel-iron or stony > iron meteorite to a modern INDUSTRIAL metallurgist. > Ask him or her to describe the microstructure, without you > giving them any “meteorite words” or concepts. > Then, Listen! Next, give that person one of the > metallic meteorite papers in the meteoritics literature > (other than mine) and see if that person can even understand > the language and concepts. Meteoritics metallurgy has > sealed itself inside an old language, not accessible to > today’s busy, industrial metallurgists. To quote one > of my industrial metallurgist friends who is a casting > expert and who has become a meteorite collector, "meteorite > metallurgy is in the Stone Age." > > We need a NEW METALLURGY for meteorites! Imagine what > we could learn! > > Phyllis Budka > http://meteormetals.com/ > > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
