Геохимия.mcdonough1995

Fig. 15.TiOz vs. Sc/Yb, Ca/Yb

and

(Sm/Yb)N

in peridotite

massifs (cros.~.~) and peridotite xenoliths (opencircles). The horizontiallines and

shaded

areas show the chondritic

ratio

and

an estimate

of its variation

in chondritic

meteorites,

respectively.

The

vertical lineand

its shadedarea

is our estimate

of the

TiOz content

of the

Silicate Earth and the precision of

this estimate,

respectively.

Linear regression

lines

are given

for peridotite

massifs

(dashed

line)

and peridotite

xenoliths

(solid

line); see

text for further

discussion. Data are shown for fertile

peridotites

with G40.5 wt% MgO.