[meteorite-list] The Birth of Chondrules

[j.divelbiss 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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