[meteorite-list] Conglomerates/Accretion Revisited

[Jeff Kuyken]

G'day List,

I was just reading through a very interesting paper on chondrules and came
across this paragraph which is along the same lines of discussion a few
weeks ago regarding the accretion of chondrules:


Several authors have suggested that some chondrules may have been plastic or
partially molten in situ. Strong evidence for this is found in Tieschitz
(H3.6) (Hutchison et al. 1979; Hutchison and Bevan 1983). In this meteorite,
chondrules and their dark rims have been deformed by the impingement of
adjacent objects, presumably while the rock was hot. The implications of
these observations are not clear. Tieschitz has a unique texture in which
feldspathic material, “white matrix,” is present between chondrules. If
Tieschitz accreted within hours (or minutes) of chondrule formation, then
serious constraints are placed on mechanisms for chondrule formation.


Interesting food for thought isn't it?

Cheers,

Jeff Kuyken
I.M.C.A. #3085
www.meteorites.com.au


Reference: GROSSMAN J. N., RUBIN A. E., NAGAHARA H. AND KING E. A. (1988)
Properties of chondrules. In Meteorites and the Early Solar System (eds. J.
F. Kerridge and M. S. Matthews), pp. 619-659. Univ. Arizona Press, Tucson,
Arizona, USA.