[meteorite-list] Are chondrites sedimentary rocks?

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Thu Apr 22 10:16:37 2004
Message-ID: <20030828022313.6415453791_at_pairlist.net>

Bernd, Martin and others,

While I don't believe chondrites are sedimentary rocks as we know them,
somewhere (? where, I'm not sure) I have read simple descriptions that imply
that the collecting/coalescing of chondrules into a large group (ie. a great
big rock!!!) is similar/akin to the accumulation of rock/soil/organic
particles that make up many of our earthly sedimentary rocks. Small particles
lumping together to make a rock...which is different than the creation of
igneous rocks in magma chambers growing crystals of minerals, connecting to
one another, etc. with magma makeup changes occuring as the pressure and
temperature changes.

Could that be what they were implying in that article?

John


   
> Martin wrote:
>
> > In the interview, Ebel makes two comments that made me wonder...
> > First, he mentions that "Most meteorites are pieces of asteroids.
> > A very few are comets."
>
> > My question is which "very few"? I figure the usual suspects are Orgueil
> > and Murchison, but some comet experts I have talked with discount them
> > and all other meteorites as being of cometary origin.
>
> .. do not forget Tagish Lake and to some extent Krymka (see David Weir's
> comments on Krymka on his website: " ... This material is enriched in volatile
> siderophiles such as Ag, Tl, and Bi, and represents a late condensate from
> a metal-depleted region of the solar nebula, possibly related to cometary
> material."
>
> > The second thing that caught my eye was when Ebel said, "Chondrites are
> > really sedimentary rocks made up of dust and then chondrules, these round
> > droplets that were once molten and now are little beads, many containing
> > glass, which were present in the solar system."
>
> He may have read O.R. Norton's comments in Joel Schiff's magazine:
>
> NORTON O.R. (1998) Are chondrites sedimentary
> rocks? (M! Feb. 1998, Vol. 4, No. 3, pp. 22-23).
>
> > My question here is if chondrites can
> > really be considered sedimentary rocks.
>
> The only references I have about sedimentary meteorites:
>
> TOMEOKA K. et al. (1997) Evidence for early sedimentary
> processes in a dark inclusion in the Vigarano CV3 chondrite
> (Meteoritics 32-4, 1997, A129).
>
> TOMEOKA K. et al. (1998) Arcuate band texture in a dark inclusion from
> the Vigarano CV3 chondrite: Possible evidence for early sedimentary
> processes (Meteoritics 33-3, 1998, 519-525).
>
> BRIDGES J.C. et al. (1998) Traces of Martian sediment in Nakhla
> and other SNC meteorites (Meteoritics 33-4, 1998, A023).
>
>
> Best wishes,
>
> Bernd
>
>
> To: martinh_at_isu.edu
> Cc: meteorite-list_at_meteoritecentral.com
>
>
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Received on Wed 27 Aug 2003 10:23:04 PM PDT