Zircons - Rare Earth Elements in Ultramafic and Mafic Rocks and their Minerals - page 169

Basanite

Alkaline basalt

Dacites

Max.

Torihama

massif

Min.

Ito massif
(Japan)

Granites
Takakuma
massif

Charnockite

Syenite

Osumi massif

(India)

(India)

(Japan)

Felsitic melts

Tonalitic melts

Syenitic melt

Syenitic melt

Figure 4.14 The graphs of coefficients of REE distribution between zircons and the bulk matrix
of the basanites (1), alkaline basalts (2), dacites (3), between zircons and granites (4),
charnockites (5), syenites (6), 7 - between zircons and experimental felsitic melt, 8 -
between zircon and tonalitic melts (in microinclusions), 9 - graph is made using K d for
Ce 3 + , 10 - graph is made using K d for Ce 4 + (data Table 4.10).

melt microinclusions contained in these zircons [Thomas et al ., 2002]. According to
these estimates, the values of K d for La ranged from 0.02 to 0.26 (average - 0.05); for
Ce - from 0.43 to 2.06 (average - 0.99); for Nd the average K d was 0.5; for all the
rest elements the average values of K d increased consistently: Sm - 3.56, Dy - 22.45,
Er - 52.72 (Figure 4.14, 8). The K d values obtained by J. Thomas et al. indicate that
under the crystallization of zircons from the diorites of Quottoon complex La, Ce and
Nd had the geochemical properties of the incompatible trace elements, while the rest
REE had the properties of compatible elements.