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

From: Rob Wesel <nakhladog_at_meteoritecentral.com>
Date: Wed Sep 28 21:32:02 2005
Message-ID: <006c01c5c495$929d7110$59681618_at_robewcufk0z2s3>

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@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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Received on Wed 28 Sep 2005 09:31:52 PM PDT