Comment on: Geochemical and isotopic (Sr, U) variations of lake waters in the Ol¡¯khon Region, Siberia, Russia: Origin and paleoenvironmental implications by F. Chabaux, M. Granet, P. Larqu¨¦, J. Riotte, E.V. Skliarov, O. Skliarova, L. Alexeieva, F. Risa