ERRATA

Theoretical study of tetrad effects observed in REE distribution coefficients between marine Fe-Mn deposit and deep seawater, and in REE(III)-carbonate complexation constants ATSUYUKI OHTA and IWAO KAWABE Geochemical Journal, Vol. 34, No. 6, pp. 455-473, 2000 The activity and activity coefficient in Eqs. ( 10) and ( 12) and the second line from the bottom-right paragraph on page 460 must be written respectively as follows. 
a n n M OH H O M OH H O and ( ) ⋅ ( ) ⋅ 3 2 3 2 λ .
Equation ( 23) is incorrect, and should be read: 
ω = ( )⋅ ( ) - K K a 2 1 2 23 / .
CO 3 
In the fourth line from the top-left paragraph on page 462, "Eqs. ( 22) and ( 23)" should be corrected as "Eqs. ( 20) and ( 21)". 
In the eleventh line from the top-left paragraph on page 462, "Equations ( 20) and ( 24)" should be replaced by "Equations ( 18) and ( 24)". 
In the eighth line from the bottom-left paragraph on page 465, "Eqs. ( 20) and ( 24)" should be replaced by "Eqs. ( 18) and ( 24)". 
In Fig. 7, the values of 3, 4 and 5 of the vertical axis on the left-hand side should be corrected as 4, 5 and 6, respectively. 
In the seventh line from the top-left paragraph on page 470, "Equation ( 20)" should be replaced by "Equation ( 18)".