[meteorite-list] The Birth of Chondrules

From: j.divelbiss_at_att.net <j.divelbiss_at_meteoritecentral.com>
Date: Mon Mar 21 13:24:56 2005
Message-ID: <031220050039.24079.42323A470009D3A900005E0F21602807489C9C070D040A90070BD206_at_att.net>

As I understand it...

most L, LL, H, E, C chondrule formations are thought to have occurred from 4.55 billion to 4.70 billion years ago, with varied dating results typically found when analyzing the different elements in a rock being studied. Whole rock dating gives up an overall average age.

I think the idea is that CAI's were formed first, followed by chondrules, followed by carbonates (and matrix material). The whole process for a given chondrite material is thought to have taken no more than a 100 million years. Chump change in time, right !

My novice two cents,

John



-------------- Original message from "Charles O'Dale" <codale0806_at_rogers.com>: --------------


> RE: Dating of Chondrules
>
> I am researching the absolute ages of chondrules, specifically;
>
> Within average chondrites, are all the chondrules the same age or do they
> vary? If so, by how much?
>
> Thanks in advance
> Charles O'Dale
> Meeting Chair
> Ottawa RASC
> http://www.ottawa.rasc.ca/astronomy/earth_craters/index.html (Pingualuit
> Crater updated)
>
>
> > Date: Fri, 11 Mar 2005 15:17:53 -0500
> > From: "Anita Westlake"
> > Subject: [meteorite-list] The Birth of Chondrules
> > To:
> > Message-ID:
> > <009301c52677$6856f460$96bf8caa_at_genlibad.library.emory.edu>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Check out this article on the birth of chondrules:
> >
> > http://www.rednova.com/news/display/?id=132866
> >
> >
> > Anita D. Westlake
> >
>
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Received on Fri 11 Mar 2005 07:39:36 PM PST