Skip to main content

Table 13.2 Calculated compositions of primary melts and equilibrated olivine

From: Petrology and Geochemistry of Mid-Ocean Ridge Basalts from the Southern Central Indian Ridge

Segment CIR-S1 CIR-S1 off CIR-S2 Knorr smt CIR-S3 CIR-S4
Cruise KH-93-3 KH-10-6 YK05-16 KH-10-6 YK05-16 KH-10-6
Site D1 DR12 6K#926 DR15 6K#927 DR13
Sample ID B2 006 R03 003 R01 003
Step 1 1 1 4 7 1
Equilibrated melt compositions
SiO2 51.16 49.78 50.83 51.37 51.29 50.36
TiO2 1.29 0.84 1.01 1.13 1.66 0.84
Al2O3 15.82 15.58 15.29 14.22 13.23 16.57
FeOa 8.02 7.91 8.29 9.35 10.38 7.93
MnO 0.14 0.14 0.14 0.17 0.16 0.15
MgO 8.96 12.11 9.78 9.13 10.17 9.46
CaO 11.32 11.36 12.35 11.69 9.94 12.49
Na2O 2.95 2.19 2.14 2.68 2.78 2.11
K2O 0.22 0.01 0.09 0.16 0.24 0.03
P2O5 0.12 0.08 0.07 0.12 0.14 0.07
Ni (ppm) 148 321 158 90 260 167
Equilibrated olivine compositions
Mg#b 91.3 93.5 91.7 90.2 90.2 91.8
NiO (wt%) 0.295 0.487 0.291 0.173 0.448 0.318
  1. aTotal Fe as FeO
  2. bMg#=100Mg/(Mg+Fe)