Table 5

Multi-session average compositionsa of Hawaiian and Tongan spinels

Hawaiian xenoliths Tonga Peridotite
68-551-2069-SAL-4169-SAL-5669-SAL-57BMRG08-98-2-2
Sample nameb114885-3114923-41114923-56114923-57
n3074753937
SiO2n.d.n.d.n.d.n.d.n.d.
TiO20.040(3)0.093(3)0.194(4)0.266(4)0.045(4)
Al2O332.0(10)55.7(10)57.1(11)38.3(12)16.33(19)
Cr2O335.2(5)11.55(12)9.00(9)28.30(12)50.9(9)
FeO*16.83(15)11.16(14)11.87(13)14.78(6)21.6(7)
MnO0.202(14)0.114(6)0.110(6)0.163(4)0.353(18)
MgO14.4(4)20.2(4)20.5(3)17.5(4)9.1(4)
CaO0.011(1)n.d.0.003(2)n.d.n.d.
Na2On.d.n.d.n.d.n.d.n.d.
NiO0.144(5)0.348(10)0.392(10)0.253(8)0.048(2)
  Total98.799.199.099.598.3
Cr#0.424(8)0.122(2)0.096(2)0.332(7)0.676(4)
Fe3+/ΣFe (EPMA, corrected)0.172(18)0.204(20)0.270(23)0.283(20)0.086(15)
Fe3+/ΣFe (EPMA, uncorrected)0.149(34)0.163(62)0.227(62)0.253(57)0.081(14)
T (°C)c902 (25)1118(56)1196(82)1038(40)
Activity of magnetited0.01140.01000.01600.0183
Embedded Image e Embedded Image Embedded Image Embedded Image Embedded Image
  • Note: FeO* is total Fe calculated as FeO.

  • a Complete analyses can be found in Supplementary1 Table S1.

  • b For Hawaiian samples, the sample number assigned by E.D. Jackson is given first then the NMNH collection number.

  • c Li et al. (1995).

  • d MELTS Supplemental Calculator.

  • e P = 1.5 GPa, QFM formulation of Frost (1991).