Point #1 | Point #2 | Point #3 | Point #4 | Point #5 | Average | |
---|---|---|---|---|---|---|
MgO | 0.45 | 0.43 | 0.43 | 0.43 | 0.45 | 0.44 |
Al2O3 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 | 0.52 |
SiO2 | 0.13 | 0.17 | 0.18 | 0.19 | 0.12 | 0.16 |
CaO | 7.84 | 7.83 | 7.85 | 8.09 | 7.89 | 7.90 |
TiO2 | 35.1 | 35.0 | 34.9 | 35.2 | 35.0 | 35.0 |
FeO | 5.86 | 5.86 | 5.81 | 5.71 | 5.77 | 5.80 |
Y2O3 | 4.46 | 4.40 | 4.38 | 4.42 | 4.38 | 4.41 |
ZrO2 | 36.6 | 36.4 | 36.5 | 36.5 | 35.9 | 36.4 |
La2O3 | 0.10 | 0.10 | 0.07 | 0.09 | 0.10 | 0.09 |
Ce2O3 | 0.78 | 0.75 | 0.74 | 0.81 | 0.76 | 0.77 |
Nd2O3 | 1.17 | 1.17 | 1.17 | 1.19 | 1.20 | 1.18 |
Sm2O3 | 0.48 | 0.49 | 0.49 | 0.52 | 0.47 | 0.49 |
Gd2O3 | 0.74 | 0.75 | 0.76 | 0.77 | 0.77 | 0.76 |
PbO | 0.47 | 0.46 | 0.43 | 0.49 | 0.44 | 0.46 |
ThO2 | 0.64 | 0.64 | 0.64 | 0.64 | 0.63 | 0.64 |
UO2 | 0.24 | 0.25 | 0.25 | 0.23 | 0.23 | 0.24 |
Total | 95.6 | 95.2 | 95.1 | 95.8 | 94.6 | 95.3 |
Pb | 0.44 | 0.43 | 0.40 | 0.46 | 0.41 | 0.43 |
Th | 0.57 | 0.56 | 0.57 | 0.56 | 0.55 | 0.56 |
U | 0.21 | 0.22 | 0.22 | 0.20 | 0.21 | 0.21 |
Age (Ma) | 4610 | 4466 | 4353 | 4760 | 4483 | |
SD | 380 | 381 | 395 | 371 | 393 | |
Atomic ratios based on 7 atoms of oxygen | ||||||
Al | 0.039 | 0.039 | 0.039 | 0.039 | 0.040 | 0.039 |
Si | 0.009 | 0.011 | 0.012 | 0.012 | 0.008 | 0.010 |
Ca | 0.537 | 0.538 | 0.540 | 0.553 | 0.545 | 0.543 |
Ti | 1.689 | 1.690 | 1.686 | 1.688 | 1.698 | 1.690 |
Fe | 0.313 | 0.314 | 0.312 | 0.304 | 0.311 | 0.311 |
Y | 0.152 | 0.150 | 0.150 | 0.150 | 0.150 | 0.150 |
Zr | 1.140 | 1.138 | 1.142 | 1.135 | 1.129 | 1.137 |
La | 0.002 | 0.002 | 0.002 | 0.002 | 0.002 | 0.002 |
Ce | 0.018 | 0.018 | 0.017 | 0.019 | 0.018 | 0.018 |
Nd | 0.027 | 0.027 | 0.027 | 0.027 | 0.028 | 0.027 |
Sm | 0.011 | 0.012 | 0.012 | 0.012 | 0.011 | 0.012 |
Gd | 0.016 | 0.016 | 0.016 | 0.016 | 0.016 | 0.016 |
Pb | 0.008 | 0.008 | 0.007 | 0.008 | 0.008 | 0.008 |
Th | 0.009 | 0.009 | 0.009 | 0.009 | 0.009 | 0.009 |
U | 0.003 | 0.004 | 0.004 | 0.003 | 0.003 | 0.003 |
Total | 4.017 | 4.016 | 4.016 | 4.020 | 4.020 | 4.018 |