Earth, Planets and Space

Table 1 Chemical compositions of pyrolite and starting materials

From: Hydrous origin of the continental cratonic mantle

	Pyrolite^a	H₂O
	Pyrolite^a	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

^aAfter Ringwood (1966); ^bMg/(Mg + Fe) atomic ratio; FeO*, total iron is listed as FeO.

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