G'day List, I was just reading through a section of 'Planetary Materials - Reviews in Mineralogy, Volume 36' regarding Chondrules when one particular sentence stuck out. It says:
"A transient heating event melted the dustballs, and they were subsequently cooled, initially at rates around hundreds of degrees per hour or faster, before accreting into their chondritic parent bodies (e.g. Wasson 1993, Hewins 1996)." So, taking this at face value then how does one account for the "Chondrule Conglomerates" which have started popping up? E.g. http://www.meteorites.com.au/features/nwa2892.html I find it intriguing that if the chondrules were cooling at such a rapid rate, then these meteorites would need to have accreted faster or at least as fast. My 'very basic' understanding also would lead me to believe that if these are Type-3 chondrites, then it rules out later metamorphism? (E.g. Remelting of chondritic parent body.) Could these chondritic parent bodies have accreted this fast? Thoughts? Cheers, Jeff ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list