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Hello Rick:

Arguement about the suitability of 13C values from bone carbonate ( apatite
fraction) has gone on for a while ( see, among others
   Kreuger HW and Sullivan CH (1984) Models for Carbon Isotope fractionation
   between diet and bone. In: Turnland, JR and Johnson, PE (eds), Stable
   Isotopes in Nutrition, ACS Symposium Series 258, Washington DC : 205-220.,
   Klepinger and Mintel 1986, Lee-Thorpe etal 1989a)
   Lee-Thorp JL and van der Merwe NJSchoeninger, 1987 Carbon isotope analysis of
   fossil bone apatite, South African J or Sci, 83: 712-715;
   Schoeninger, MJ, and DeNiro, MJ 1982.  Carbon isotope ratios of apatite from
   fossil bone cannot be used to reconstruct diets of animals.  Nature, 297:
   577-578.
   Schoeninger, MJ, and Moore, K. 1992. Bone Stable isotope studies in
   archeology. Journal of World Prehistory, 6 (2): 247-296.
   Sillen, A, Sealy, JC, van der Merwe, NJ 1989. Chemistry and Paleodietary
   Research: No More Easy Answers. American Antiquity, 54 (3): 504-512.
   Sullivan, CH, and Kreuger, HW. 1981. Carbon isotope analysis of separate
   chemical phases in modern and fossil bone. Nature, 292 : 333-335; DeNiro MJ
   and Eptstein, S 1978 Geochim et Cosmochim. Acta 42: page 504 - 505 esp.)

More recently the tendancy has indeed been to use bone protein (and other tissue
fractions) for dietary analysis, and so to demineralise the bone.

Cheers,
Nancy Beavan Athfield
Rafter Radiocarbon Lab
Inst. Geological and Nuclear Sciences
NEW ZEALAND
http://www.gns.cri.nz/atom/rafter/rafter.htm