--- abdelfattah gharrad <[EMAIL PROTECTED]> wrote: > if there were a resemblance of some criteria of > certain meteorites with terrestrial rocks(basalt). > the meteorites had the same processes of fusion and > crystallization like the magmatic and volcanic > rocks? > Abdel.
While there are differences of scale, gravity(meaning actual depth, temperatures and pressures) and presence of water/gasses-- Yes we believe the processes are the governed by the same principles. This is why we feel comfortable using terrestrial geological and minerological terms to describe features in some meteorites. These petrographical types are found on bodies that were large enough to retain the heat of radioactive decay produced initially by Al26. They are also called "differentiated", which is a catch-all to describe the fusion and recrystalization process. Elton ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
