Hello all,
We've analyzed a series of midge head capsules from a lough in 
western Ireland and find that the fractionation factor (1.028) 
published by Woller et al. results in calculated water d18O values 
that are about 8 per mil too low. Is anyone aware of other modern 
calibration studies of these head capsules? Is there any other 
explanation for this large offset between expected values and those 
observed?
Cheers,
Bill

-- 
Dr. William P. Patterson
Professor and Director of the Saskatchewan Isotope Laboratory
Department of Geological Sciences
University of Saskatchewan
114 Science Place
Saskatoon SK S7N 5E2
Canada
Phone: 306-966-5691(office); 306-966-5712(lab)
Email: [log in to unmask]
Web: http://geochemistry.usask.ca/bill.html