Mark inquired: > Does anyone know what the current thinking on the 'Chassigny > Chondrules' is? (as to what they actually are or how they formed?)
I found this, but can anyone point me in the direction of any further information? http://www.geocities.com/~dweir/chassig1.htm Hello Mark and List, At 19:11 12/04/00 +0200, you wrote: [EMAIL PROTECTED] schrieb: The 1985 Blue Book lists it and surprisingly states that "it contains chondrules". How can this be? I can't find any references to Chassigny chondrules after wading through a mountain of abstracts. Confused, Rob. Hello Confused Rob and All! Both the third and fourth editions of the Meteorite Catalogue state that Chassigny contains chondrules. I think this is a misinterpretation of a paper by Mason B. et al. (1975) The composition of the Chassigny meteorite (Meteoritics 11, 1975, pp. 21-27). The authors suggested that Chassigny is an olivine-rich cumulate derived from a c h o n d r i t e - like magma. But in his book "Meteorites" published in 1962, Brian Mason clearly states on p. 111 that it differs from the "olivine-pigeonite chondrites" in the a b s e n c e of chondrules. Now, where does this misconception about chondrules stem from? Varela M.E. et al. found pure glass inclusions (< 20 µm in diameter) in Chassigny that have a "nearly circular disk shape and generally occur in clusters." They also found " multiphase inclusions (> 20 µm in diameter)" that have "a rounded or euhedral shape and occur generally isolated". Perhaps these circular disks were misinterpreted as chondrules in the early sixties. My two cents! :-) Best regards, Bernd Best wishes, Bernd To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
