James,
You should know that Bob Clayton has been doing this for years! Ask him or
Tosh Mayeda.
Hal
Dr. Haraldur R. Karlsson
Assistant Professor
Department of Geosciences
and Department of Chemistry and Biochemistry (Joint)
Mailing Address:
Department of Geosciences
Box 41053,Texas Tech University
Lubbock, TX 79409
USA
Phones - (806)-742-3130 Office
(806)-742-3112 Stable Isotope Laboratory
Fax - (806)-742-0100
world-wide-web: http://www.ttu.edu/~geosc/