Geochemical relationship between REE and PGE in mafic and ultramafic rocks and their petrogenetic significance - Rare Earth Elements in Ultramafic and Mafic Rocks and their Minerals - page 274

Dunites

Peridotites

Websterites

Chromitites

Gabbro-norites (a)
and gabbro (b)

Olivine clinopyroxenites

b

a

Figure 10.30 Chondrite-normalized REE patterns for dunites (1), peridotites (2), websterites (3), oliv-
ine clinopyroxenites (4), gabbro-norites and gabbro (5), and chromitites (6) from Muskox
massif (Canada) (data Table 10.14).

Dunites

Peridotites

Websterites

Olivine clinopyroxenites
Gabbro-norites (a)
and abbro (b)

a

b

Figure 10.31 Chondrite-normalized PGE patterns for dunites (1), peridotites (2), websterites
(3), olivine clinopyroxenites, gabbro-norites and gabbro (4) from Muskox massif (Canada)
(data Table 10.14).

to assume that in this case there is an inverse relation between the contents of the
elements of these two groups.
Based on the synthesis of available analytical data on PGE contents in different
types of ultramafic and mafic rocks Barnes et al . [1985] proposed to single out three
following mechanisms of fractionation of these elements, which were implemented