The lanthanide tetrad effect in some pegmatite minerals from Conţu-Negovanu (Lotru-Cibin Mts.)

Abstract

Masuda and Ikeuchi (1978) were the first to observe the lanthanide tetrad effect in the marine environment and before them, the same behavior of REEs was described in non–geological disciplines by Fidelis and Siekierski (1966) and Peppard et al. (1969) who observed the tetrad effect in patterns of liquid–liquid REE distribution coefficients. In non–geological disciplines it is also described as “nephelauxetic effect” (Jorgenson, 1970), “inclined W effect” (Sinha, 1978) or “double–double effect” (Mioduski, 1997).