Figure 2.
Transport model for calcium isotopes in organisms. In this model, there is no calcium isotopic fractionation associated with absorption or excretion of dietary calcium. Calcium incorporated into bone is derived from the soft tissue reservoir, and there is a fractionation (Δb) associated with the formation of mineralized tissue. There is no calcium isotopic fractionation associated with dissolution of mineralized tissue. The model does not take account of any differences between soft tissue components.