[meteorite-list] AD - Do you want a rareandimportantMetachondrite?

[Rob Wesel]

Thanks Stan, that goes into the "you learn something new every day" file
Quick, dirty, and easy to understand

Rob Wesel
http://www.nakhladogmeteorites.com
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----- Original Message ----- 
From: "stan ." <laser_maniac at hotmail.com>
To: <info at meteorites.com.au>; <meteorite-list at meteoritecentral.com>
Sent: Wednesday, September 28, 2005 6:27 PM
Subject: Re: [meteorite-list] AD - Do you want a 
rareandimportantMetachondrite?


>
>
>>This is interesting as I've never heard this before. Can terrestrial
>>weathering really have a significant effect on oxygen results?
>
> yup - oxygen isotopse analysis basically involves vaporizing a bit of the 
> meteorite with a laser in a strongly oxydyzing environment - normally 
> flourine. basically all atomic bonds between atoms int he meteorite are 
> broken down int he vaporized bit freeing up any of the chemically 
> sequestered oxygen. the flourine atmosphere is present to latch on to 
> anything that would otherwise want to bond back with the now free oxygen. 
> the resulting minute gas sample is sent trought  a series of filters to 
> remove these products adn the oxygen then goes to a mass spectrometer to 
> identify the ratio between the various isotopse present. any terrestrial 
> source of oxygen such as calcium carbonate will therefore alter the ratio 
> of the isotopse present.
>
>
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