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 ." <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <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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