Geoscience Reference
In-Depth Information
5136
Ambient Mantle
CMB Pools
5134
0.708
5132
5130
0.706
5128
5126
0.704
5124
5122
0.702
15
16
17
18
19
20
21
22
23
24
15
16
17
18
19
20
21
22
23
24
0.30
206
Pb/
204
Pb
44
206
Pb/
204
Pb
0.28
0.26
42
0.24
0.22
40
0.20
0.18
38
0.16
0.14
36
0.12
15
16
17
18
19
20
21
22
23
24
15
16
17
18
19
20
21
22
23
24
206
Pb/
204
Pb
5136
206
Pb/
204
Pb
16.4
5134
16.2
5132
16.0
5130
15.8
5128
15.6
5126
15.4
5124
15.2
15.0
5122
15
16
17
18
19
20
21
22
23
24
0.702
0.704
0.706
0.708
206
Pb/
204
Pb
87
Sr/
86
Sr
Fig. 12.5
(From Brandenburg
et al
., 2008) showing the isotopic spread of particles distributed through the model.
The red points indicate those specifically in the dense pools near the core-mantle boundary (CMB). Triangles
indicate the approximate spread of observations (from the PetDB data base). The isotopic spread predicted from the
models matches the observations for EM1/HIMU and DMM reasonably well in the four employed isotope systems.
We do not match the trend towards EMII (but we also do not explicitly model sediment recycling in subduction
zones). Reproduced with permission of Elsevier.
