Chemistry Reference
In-Depth Information
Table 1.8
REE composition of eclogites from Atbashi
metamorphic complex, Kyrgyzstan (ppm).
Element
L-12
L-13
La
3,75
8,26
Ce
6,49
15,84
Pr
1,25
2,14
Nd
6,72
9,10
Sm
2,03
2,45
Eu
0,63
0,80
Gd
3,36
4,13
Tb
0,70
0,99
Dy
5,55
7,65
Ho
1,33
1,84
Er
3,91
5,51
Tm
0,63
0,92
Yb
4,14
5,74
Lu
0,63
0,84
Total
41,1
66,2
La/Yb)
n
0,61
0,97
(Eu/Eu*)
n
0,73
0,76
Note: The analyses carried out by the ICP-MS method on mass-
spectrometer “Element” (firm Finnigan MAT, Germany) in the
Analytical Centre of UIGGM SB of USSR AS (analysts S. Palesskii &
I. Nikolaeva). Relative standard deviation - less 10%.
L-13
L-12
AT-83-17
AT-83-5
Figure 1.7
Chondrite-normalized REE patterns for eclogites from Atbashi metamorphic complex
(Kyrgyzstan). 1 - data Table 1.8; 2 - data by [Shatsky, 1990]. N-MORB and E-MORB - pat-
terns for normal and enriched basalts of mid-ocean ridges (MORB) according to (data
[Sun & McDonough, 1989]).
from 4.0 to 3.6 ppm. Rather distinct zonation, which is typical for the distribution
of most other incompatible trace elements, has not been identified in the studied
garnets. Different zones of garnet crystals have approximately the same values of Zr/
Hf (39.8-44.5) and Nb/Ta (30.0-34.4) in both eclogite samples.
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