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Table 1 Chemical compositions of pyrolite and starting materials

From: Hydrous origin of the continental cratonic mantle

  Pyrolitea H2O
2 wt.% 8 wt.%
SiO2 45.16 44.55 41.82
TiO2 0.71 0.56 0.53
Al2O3 3.54 3.14 2.95
Cr2O3 0.43 0.42 0.40
FeO* 8.47 8.05 7.56
MnO 0.14   
MgO 37.48 36.82 34.56
CaO 3.08 2.96 2.78
Na2O 0.57 1.19 1.11
K2O 0.13 0.17 0.16
P2O5 0.06   
NiO 0.20 0.14 0.13
H2O   2.00 8.00
Total 99.97 100.00 100.00
Mg#b 0.887 0.891 0.891
  1. aAfter Ringwood (1966); bMg/(Mg + Fe) atomic ratio; FeO*, total iron is listed as FeO.