Record number :
Title of article :
Has the REE composition of seawater changed over geological time?
Author/Authors :
Shields، نويسنده , , Graham A. and Webb، نويسنده , , Gregory E.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
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Abstract :
In this paper, we present a generalisation of the classical growth rate equations to the case of crystallisation in solid solution–aqueous solution solution (SS-AS) systems. In these new equations, basic growth parameters, interfacial free energy and supersaturation are functions of the solid composition. Therefore, each equation describes, for a given aqueous solution, a growth rate distribution as a function of the solid composition. Different crystal growth models such as two-dimensional nucleation or spiral growth mechanisms provide different growth rate distributions. We have studied the general behaviour of growth rate equations in solid solution–aqueous (SS-AS) systems. Finally, we have applied the generalised growth rate equations to the BaxSr1−xSO4–H2O SS-AS system. It allowed us to determine relationships between growth mechanisms and solid composition in such a model system. The result of our calculations were discussed and compared with previous experimental work on the BaxSr1−xSO4–H2O SS-AS system.
Keywords :
REE composition , Biogenic phosphate , Seawater
Journal title :
Chemical Geology
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