Zircons - Rare Earth Elements in Ultramafic and Mafic Rocks and their Minerals - page 146

1st type (1)

1st type (3)

1st type (2)

4th type

2nd type 3rd type

Figure 4.3 Chondrite-normalized REE patterns for zircons from minettes from Kirovograd block
(Ukraine) (data Table 4.3.).

Figure 4.4 Chondrite-normalized REE patterns for model parental melts of minettes from Kirovograd
block (Ukraine). REE composition of parental melts were calculated on the basis of their
contents in the zircons, assigned to the 1st type (see Table 4.3.), and using the values of K d
(zircon/melt) (data [Hinton & Upton, 1991]).

stage of its crystallization have undergone different intensity effects of the residual
portions of the parent melt, resulting in partial redistribution of these trace elements,
REE included.
Ultramafic rocks. In these rocks the accessory zircons are much rarer present and
in much smaller quantities than in most other varieties of magmatic and metamor-
phic rocks, so they are still the least studied with respect to the geochemistry of REE
and other trace elements. Recent detailed studies include the zircons from peridotites
forming massifs in the Northern Tibet [Song et al ., 2005] and Sulu provinces (China)