Antonio, Another paper worth having a look at is ...: Rosenbaum, J. & Sheppard, S.M.F. (1986) "An isotopic study of siderites, dolomites and ankerites at high temperatures". Geochim. Cosmochim. Acta, 50, 1147-1150. Good luck with your analyses. Siderite, magnesite and the like are not my favourite carbonates to run! Cheers, Clemente >Dear isotopers: > >Does anyone know where I can find the oxygen isotopic fractionation >equation for siderite, ankerite and H2O at temperature of 0-300 C. >Any information would be greatly appreciated. >Thanks, > >--------------------- >Antonio Delgado Huertas ----------------------------------------------- Dr. Clemente Recio Stable Isotope Laboratory Fac. de Ciencias Univ. de Salamanca E 37008 - Salamanca Spain Phone: (+34) 23 29 44 00 Ext. 1540 Fax: (+34) 23 29 45 14 E-mail: [log in to unmask] -----------------------------------------------