Cogenetic Origin of Magmatic Enclaves in Peralkaline Felsic Volcanic Rocks from the Sanshui Basin, South China
Abstract
:1. Introduction
2. Geological Background
3. Materials and Methods
4. Results
4.1. Petrography
4.2. Whole-Rock Geochemistry
Sample | 19ss036-1 | 19ss037-2a | 19ss037-2b | 20ss020-1 | 20ss022-1 | 19ss036-1 | 20ss020-1 | 20ss022-1 | Kilombe, Kenya | Azores, Portugal |
---|---|---|---|---|---|---|---|---|---|---|
Rock Type | Syenite | Syenite | Syenite | Syenite | Syenite | Trachyte | Comendite | Trachyte | Syenite, n = 20 | Syenite, n = 17 |
Group | Enclave | Enclave | Enclave | Enclave | Enclave | Host | Host | Host | Enclave | Enclave |
Ba | 98.00 | 65.20 | 75.60 | 88.10 | 72.30 | 40.90 | 61.10 | 19.70 | 48.70 | 61.00 |
Be | 4.51 | 4.19 | 3.97 | 4.11 | 4.62 | 6.22 | 7.69 | 7.91 | 4.11 | |
Co | 0.60 | 1.00 | 1.00 | 0.80 | 0.90 | 21.40 | 0.30 | 0.60 | 4.16 | |
Cr | 1 | 1 | 1 | 1 | 1 | 1.3 | 3 | 2 | ||
Cs | 0.58 | 2.60 | 2.35 | 0.52 | 1.67 | 0.81 | 2.98 | 2.56 | 0.91 | 1.44 |
Ga | 40.70 | 41.90 | 40.60 | 39.10 | 39.80 | 46.90 | 50.70 | 45.30 | 35.55 | 29.57 |
Hf | 21.20 | 23.10 | 20.80 | 20.10 | 20.40 | 42.50 | 52.10 | 25.00 | 14.40 | 25.36 |
Nb | 188 | 177 | 166 | 179 | 176 | 272 | 336 | 164 | 195 | 217 |
Ni | 0.5 | 0.3 | 0.3 | 0.5 | 0.4 | 0.8 | 1.2 | 1.8 | ||
Pb | 10.00 | 9.20 | 12.40 | 9.30 | 10.80 | 19.50 | 13.60 | 10.40 | ||
Rb | 166 | 219 | 193 | 160 | 188 | 229 | 306 | 176 | 137 | 186 |
Sr | 22.80 | 16.20 | 16.00 | 19.80 | 21.10 | 9.03 | 14.50 | 7.20 | 11.85 | 79.15 |
Ta | 9.50 | 11.60 | 9.50 | 9.10 | 9.90 | 17.40 | 20.90 | 9.40 | 11.57 | 13.67 |
Th | 19.35 | 22.30 | 21.40 | 18.20 | 23.30 | 36.90 | 49.50 | 19.45 | 18.31 | 25.64 |
U | 3.25 | 2.74 | 2.33 | 3.01 | 2.45 | 5.16 | 5.20 | 3.54 | 5.03 | 7.97 |
V | 17 | 5 | 6 | 14 | 8 | 1.33 | 2.0 | 1.0 | 35.75 | |
Zr | 972 | 997 | 883 | 903 | 913 | 1834 | 2360 | 1190 | 558 | 1119 |
Y | 96 | 94 | 85 | 92 | 90 | 165 | 205 | 171 | 44 | 56 |
La | 245 | 183 | 155 | 215 | 204 | 227 | 439 | 416 | 145 | 157 |
Ce | 313 | 130 | 398 | 301 | 170 | 267 | 167 | 723 | 175 | 292 |
Pr | 54 | 37 | 33 | 50 | 39 | 47 | 82 | 91 | 24 | 30 |
Nd | 191 | 128 | 116 | 173 | 128 | 167 | 297 | 315 | 81 | 103 |
Sm | 32.50 | 20.80 | 19.10 | 29.30 | 20.10 | 32.30 | 57.30 | 59.00 | 11.91 | 16.04 |
Eu | 1.79 | 1.05 | 1.17 | 1.66 | 1.29 | 1.18 | 3.10 | 5.46 | 1.34 | 1.62 |
Gd | 24.70 | 18.00 | 16.10 | 22.90 | 15.97 | 27.70 | 49.30 | 45.40 | 10.04 | 13.27 |
Tb | 3.62 | 3.00 | 2.69 | 3.35 | 2.63 | 5.46 | 7.23 | 6.97 | 1.42 | 2.04 |
Dy | 20.10 | 18.20 | 15.95 | 18.80 | 15.87 | 29.20 | 38.30 | 35.30 | 8.19 | 11.21 |
Ho | 3.53 | 3.47 | 3.10 | 3.28 | 3.03 | 5.71 | 7.01 | 6.39 | 1.59 | 2.11 |
Er | 9.66 | 10.05 | 8.98 | 8.91 | 8.77 | 16.50 | 19.00 | 16.80 | 4.82 | 6.21 |
Tm | 1.35 | 1.48 | 1.34 | 1.28 | 1.37 | 2.92 | 2.72 | 2.38 | 0.89 | 0.94 |
Yb | 8.88 | 9.99 | 9.02 | 8.21 | 8.94 | 17.80 | 17.60 | 14.65 | 6.15 | 6.27 |
Lu | 1.28 | 1.47 | 1.31 | 1.18 | 1.30 | 2.42 | 2.52 | 2.20 | 1.02 | 0.93 |
LaN/YbN | 19.79 | 13.10 | 12.33 | 18.78 | 16.37 | 9.15 | 17.89 | 20.37 | 16.89 | 17.99 |
Ce/Ce* | 0.64 | 0.37 | 1.30 | 0.69 | 0.44 | 0.60 | 0.20 | 0.87 | 0.66 | 0.97 |
Eu/Eu* | 0.19 | 0.16 | 0.20 | 0.19 | 0.21 | 0.12 | 0.17 | 0.31 | 0.36 | 0.33 |
Nb/U | 58 | 64 | 71 | 59 | 72 | 53 | 65 | 46 |
4.3. Mineral Geochemistry
Point | 036-2-1 | 036-2-2 | 036-2-3 | 036-2-4 | 036-2-5 | 022-2-1 | 022-2-2 | 022-2-3 | 022-2-4 | 020-2-1 | 020-2-2 | 020-2-3 | 020-2-4 | 020-2-5 | 020-2-6 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 66.77 | 67.49 | 66.95 | 65.87 | 66.60 | 67.76 | 67.27 | 68.40 | 65.36 | 66.83 | 66.46 | 66.83 | 67.81 | 67.69 | 66.95 |
TiO2 | 0.05 | 0.02 | 0.02 | 0.05 | 0.03 | 0.06 | 0.04 | 0.02 | 0.07 | 0.04 | 0.11 | 0.00 | 0.05 | 0.13 | 0.06 |
Al2O3 | 18.47 | 18.57 | 18.82 | 18.87 | 19.32 | 18.49 | 18.74 | 17.70 | 18.84 | 19.60 | 18.70 | 17.84 | 18.16 | 18.49 | 17.84 |
FeOt | 0.18 | 0.42 | 0.26 | 0.20 | 0.23 | 0.37 | 0.15 | 0.27 | 0.42 | 0.32 | 0.14 | 0.92 | 0.26 | 0.23 | 0.26 |
MnO | 0.01 | 0.01 | 0.03 | 0.00 | 0.00 | - | 0.03 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.02 | 0.00 | 0.01 |
CaO | 1.19 | 0.18 | 0.12 | 0.76 | 0.44 | 0.34 | 0.70 | 0.25 | 0.56 | 0.86 | 0.68 | 0.00 | 0.27 | 0.71 | 0.66 |
Na2O | 6.89 | 6.85 | 6.93 | 7.59 | 7.96 | 7.46 | 6.93 | 8.18 | 8.45 | 8.90 | 6.96 | 6.44 | 8.32 | 8.26 | 6.32 |
K2O | 5.49 | 5.67 | 7.27 | 5.82 | 5.60 | 5.89 | 5.16 | 5.45 | 5.55 | 4.13 | 6.80 | 7.84 | 5.42 | 4.81 | 7.88 |
Total | 99.04 | 99.21 | 100.41 | 99.16 | 100.17 | 100.39 | 99.01 | 100.27 | 99.25 | 100.68 | 99.87 | 99.86 | 100.31 | 100.31 | 99.97 |
Formulae on basis of 8 oxygens | |||||||||||||||
Si | 3.003 | 3.022 | 2.993 | 2.973 | 2.971 | 3.012 | 3.013 | 3.039 | 2.957 | 2.956 | 2.985 | 3.017 | 3.016 | 3.004 | 3.015 |
Ti | 0.002 | 0.001 | 0.001 | 0.002 | 0.001 | 0.002 | 0.001 | 0.001 | 0.002 | 0.001 | 0.004 | 0.000 | 0.002 | 0.004 | 0.002 |
Al | 0.979 | 0.984 | 0.992 | 1.004 | 1.016 | 0.969 | 0.989 | 0.927 | 1.004 | 1.022 | 0.990 | 0.949 | 0.952 | 0.967 | 0.947 |
Fe3+ | 0.007 | 0.016 | 0.010 | 0.008 | 0.009 | 0.014 | 0.006 | 0.010 | 0.016 | 0.012 | 0.005 | 0.035 | 0.010 | 0.009 | 0.010 |
Mn | 0.001 | 0.000 | 0.001 | 0.000 | 0.000 | 0.000 | 0.001 | 0.000 | 0.000 | 0.000 | 0.001 | 0.000 | 0.001 | 0.000 | 0.000 |
Ca | 0.057 | 0.008 | 0.006 | 0.037 | 0.021 | 0.016 | 0.034 | 0.012 | 0.027 | 0.041 | 0.033 | 0.000 | 0.013 | 0.034 | 0.032 |
Na | 0.600 | 0.598 | 0.600 | 0.665 | 0.688 | 0.643 | 0.602 | 0.705 | 0.741 | 0.764 | 0.606 | 0.563 | 0.718 | 0.711 | 0.552 |
K | 0.315 | 0.325 | 0.414 | 0.335 | 0.319 | 0.334 | 0.295 | 0.309 | 0.320 | 0.233 | 0.389 | 0.451 | 0.307 | 0.272 | 0.453 |
total | 4.964 | 4.955 | 5.017 | 5.022 | 5.024 | 4.990 | 4.940 | 5.003 | 5.068 | 5.028 | 5.014 | 5.015 | 5.018 | 5.000 | 5.011 |
An | 6 | 1 | 1 | 4 | 2 | 2 | 4 | 1 | 3 | 4 | 3 | 0 | 1 | 3 | 3 |
Ab | 62 | 64 | 59 | 64 | 67 | 65 | 65 | 69 | 68 | 74 | 59 | 56 | 69 | 70 | 53 |
Or | 32 | 35 | 41 | 32 | 31 | 34 | 32 | 30 | 29 | 22 | 38 | 44 | 30 | 27 | 44 |
T | 872 | 877 | 866 | 877 | 883 | 891 | 890 | 899 | 898 | 871 | 841 | 834 | 862 | 864 | 828 |
Piont | 022-1 | 022-2 | 022-3 | 022-4 | 022-5 | 022-6 | 036-1 | 036-2 | 036-3 | 036-4 | 036-5 | 036-6 | 036-1 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 48.91 | 49.38 | 49.15 | 48.14 | 49.45 | 49.65 | 49.58 | 49.88 | 49.87 | 48.97 | 49.77 | 49.88 | 51.03 |
TiO2 | 0.59 | 0.51 | 0.49 | 0.56 | 0.60 | 0.48 | 0.34 | 0.33 | 0.44 | 0.52 | 0.39 | 0.29 | 0.03 |
Al2O3 | 0.39 | 0.33 | 0.32 | 0.32 | 0.51 | 0.42 | 0.31 | 0.35 | 0.32 | 0.32 | 0.39 | 0.36 | 0.16 |
FeO | 20.97 | 21.49 | 21.89 | 22.55 | 19.78 | 22.15 | 20.67 | 21.15 | 21.35 | 22.57 | 22.19 | 20.87 | 33.64 |
MnO | 0.84 | 0.91 | 0.98 | 0.89 | 0.82 | 0.92 | 0.87 | 0.94 | 0.92 | 0.90 | 0.98 | 0.83 | 2.04 |
MgO | 6.97 | 6.41 | 6.84 | 5.77 | 7.12 | 5.46 | 7.05 | 6.42 | 6.33 | 5.63 | 5.61 | 6.76 | 0.01 |
CaO | 21.00 | 20.01 | 19.98 | 20.95 | 20.47 | 19.83 | 20.15 | 20.38 | 19.78 | 20.30 | 19.53 | 20.45 | 1.01 |
Na2O | 0.39 | 0.41 | 0.43 | 0.38 | 0.37 | 0.62 | 0.46 | 0.58 | 0.44 | 0.43 | 0.50 | 0.54 | 11.39 |
Total | 100.05 | 99.45 | 100.08 | 99.56 | 99.14 | 99.52 | 99.44 | 100.03 | 99.44 | 99.64 | 99.36 | 99.97 | 99.31 |
Formulae on basis of 6 oxygens | |||||||||||||
Si | 1.945 | 1.972 | 1.956 | 1.942 | 1.967 | 1.985 | 1.973 | 1.977 | 1.986 | 1.965 | 1.991 | 1.976 | 2.121 |
Ti | 0.018 | 0.015 | 0.015 | 0.017 | 0.018 | 0.014 | 0.010 | 0.010 | 0.013 | 0.016 | 0.012 | 0.009 | 0.001 |
Al | 0.018 | 0.016 | 0.015 | 0.015 | 0.024 | 0.020 | 0.015 | 0.016 | 0.015 | 0.015 | 0.019 | 0.017 | 0.008 |
Fe3+ | 0.129 | 0.063 | 0.115 | 0.143 | 0.052 | 0.043 | 0.081 | 0.079 | 0.030 | 0.083 | 0.022 | 0.084 | 0.922 |
Fe2+ | 0.561 | 0.651 | 0.607 | 0.609 | 0.603 | 0.695 | 0.602 | 0.618 | 0.680 | 0.669 | 0.720 | 0.602 | 0.157 |
Mn | 0.028 | 0.030 | 0.033 | 0.031 | 0.028 | 0.031 | 0.029 | 0.031 | 0.031 | 0.031 | 0.033 | 0.028 | 0.072 |
Mg | 0.413 | 0.380 | 0.406 | 0.347 | 0.422 | 0.325 | 0.418 | 0.380 | 0.376 | 0.337 | 0.335 | 0.399 | 0.000 |
Ca | 0.895 | 0.853 | 0.852 | 0.905 | 0.872 | 0.849 | 0.859 | 0.866 | 0.844 | 0.873 | 0.837 | 0.868 | 0.045 |
Na | 0.030 | 0.032 | 0.033 | 0.030 | 0.029 | 0.048 | 0.036 | 0.044 | 0.034 | 0.033 | 0.038 | 0.042 | 0.917 |
Total | 4.036 | 4.012 | 4.032 | 4.039 | 4.015 | 4.012 | 4.023 | 4.022 | 4.008 | 4.023 | 4.006 | 4.023 | 4.243 |
Wo | 45 | 44 | 43 | 45 | 45 | 44 | 44 | 45 | 44 | 44 | 44 | 44 | 4 |
En | 21 | 20 | 20 | 17 | 22 | 17 | 21 | 20 | 19 | 17 | 17 | 20 | 0 |
Fs | 35 | 37 | 36 | 38 | 34 | 39 | 35 | 36 | 37 | 38 | 39 | 35 | 96 |
T1 | - | - | - | - | - | 880 | - | - | 898 | - | 880 | - | - |
P1 | 0.61 | 0.72 | 0.67 | 0.89 | 0.53 | 1.14 | 0.32 | 0.23 | 0.29 | 0.36 | 0.58 | 0.20 | - |
T2 | 867 | 869 | 867 | 867 | 888 | 867 | 869 | 867 | 875 | 867 | 870 | 883 | - |
P2 | 1.28 | 1.50 | 1.50 | 1.50 | 1.50 | 1.13 | 1.33 | 1.03 | 1.17 | 1.25 | 1.25 | 1.07 | - |
T3 | 936 | 938 | 935 | 925 | 940 | 925 | 877 | 875 | 875 | 867 | 869 | 876 | - |
P3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | - |
Point | 022-1-1 | 022-1-2 | 022-1-3 | 022-1-4 | 036-1-1 | 036-1-2 | 036-1-3 | 036-1-4 | 037-1-1 | 037-1-2 | 037-1-3 | 037-1-4 | 037-1-5 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 49.75 | 50.38 | 48.93 | 49.63 | 49.96 | 49.25 | 48.27 | 49.72 | 48.67 | 48.88 | 49.50 | 50.14 | 49.08 |
TiO2 | 0.30 | 0.94 | 1.01 | 0.67 | 0.78 | 1.13 | 0.60 | 0.70 | 0.47 | 0.65 | 0.74 | 0.64 | 0.76 |
Al2O3 | 0.19 | 0.39 | 0.49 | 0.56 | 0.33 | 0.49 | 0.37 | 0.53 | 0.54 | 0.62 | 0.45 | 0.46 | 0.59 |
FeOt | 34.50 | 35.56 | 33.98 | 34.15 | 34.13 | 33.57 | 35.83 | 34.24 | 35.21 | 35.99 | 34.69 | 34.45 | 34.11 |
MnO | 1.29 | 1.06 | 1.20 | 1.17 | 1.37 | 1.17 | 1.07 | 0.90 | 1.08 | 0.88 | 0.92 | 1.16 | 1.19 |
MgO | 0.13 | 0.11 | 0.21 | 0.25 | 0.27 | 0.29 | 0.19 | 0.27 | 0.31 | 0.27 | 0.29 | 0.30 | 0.28 |
CaO | 1.72 | 2.95 | 2.73 | 2.69 | 2.19 | 2.32 | 2.35 | 2.67 | 2.66 | 2.65 | 1.89 | 2.08 | 2.68 |
Na2O | 6.33 | 6.14 | 5.82 | 6.57 | 6.28 | 7.37 | 6.16 | 6.65 | 6.33 | 6.00 | 7.14 | 6.77 | 7.39 |
K2O | 1.32 | 1.30 | 1.34 | 1.37 | 1.33 | 1.37 | 1.33 | 1.34 | 1.33 | 1.30 | 1.35 | 1.36 | 1.36 |
F | 2.05 | 1.33 | 1.43 | 1.39 | 1.67 | 1.21 | 0.98 | 2.15 | 1.90 | 1.69 | 1.59 | 1.76 | 1.92 |
Cl | 0.03 | 0.05 | 0.03 | 0.09 | 0.06 | 0.05 | 0.02 | 0.05 | 0.04 | 0.07 | 0.06 | 0.05 | 0.07 |
Total | 96.73 | 99.66 | 96.57 | 97.94 | 97.64 | 97.71 | 96.76 | 98.30 | 97.73 | 98.26 | 97.93 | 98.42 | 98.60 |
Formulae on basis of 23 oxygens | |||||||||||||
Si | 7.826 | 7.791 | 7.723 | 7.751 | 7.806 | 7.707 | 7.642 | 7.770 | 7.664 | 7.677 | 7.747 | 7.800 | 7.673 |
Al | 0.137 | 0.150 | 0.237 | 0.197 | 0.147 | 0.235 | 0.325 | 0.176 | 0.299 | 0.283 | 0.199 | 0.146 | 0.274 |
Ti | 0.011 | 0.045 | 0.023 | 0.038 | 0.027 | 0.048 | 0.016 | 0.037 | 0.015 | 0.022 | 0.041 | 0.036 | 0.037 |
T.sum | 7.974 | 7.986 | 7.983 | 7.986 | 7.980 | 7.991 | 7.983 | 7.983 | 7.978 | 7.981 | 7.987 | 7.982 | 7.984 |
Al | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
Ti | 0.024 | 0.064 | 0.097 | 0.041 | 0.065 | 0.085 | 0.056 | 0.045 | 0.041 | 0.055 | 0.046 | 0.039 | 0.052 |
Fe3+ | 1.204 | 1.071 | 1.121 | 1.087 | 1.167 | 1.083 | 1.233 | 0.999 | 1.175 | 1.128 | 1.079 | 1.114 | 1.109 |
Mn2+ | 0.144 | 0.124 | 0.136 | 0.137 | 0.153 | 0.140 | 0.122 | 0.107 | 0.124 | 0.101 | 0.111 | 0.134 | 0.141 |
Mg | 0.029 | 0.026 | 0.050 | 0.058 | 0.064 | 0.069 | 0.044 | 0.064 | 0.073 | 0.063 | 0.068 | 0.070 | 0.065 |
Fe2+ | 3.340 | 3.540 | 3.360 | 3.434 | 3.321 | 3.397 | 3.422 | 3.529 | 3.438 | 3.514 | 3.474 | 3.408 | 3.448 |
C.sum | 4.741 | 4.826 | 4.764 | 4.758 | 4.769 | 4.774 | 4.877 | 4.743 | 4.852 | 4.861 | 4.778 | 4.764 | 4.816 |
Mn2+ | 0.028 | 0.015 | 0.025 | 0.018 | 0.027 | 0.015 | 0.021 | 0.012 | 0.021 | 0.016 | 0.012 | 0.019 | 0.016 |
Fe2+ | 0.000 | 0.000 | 0.005 | 0.000 | 0.000 | 0.000 | 0.088 | 0.000 | 0.024 | 0.084 | 0.000 | 0.000 | 0.000 |
Ca | 0.444 | 0.600 | 0.603 | 0.579 | 0.501 | 0.524 | 0.551 | 0.579 | 0.589 | 0.582 | 0.461 | 0.478 | 0.578 |
Na | 1.568 | 1.426 | 1.433 | 1.533 | 1.532 | 1.644 | 1.409 | 1.527 | 1.427 | 1.352 | 1.599 | 1.578 | 1.597 |
B.sum | 2.040 | 2.041 | 2.065 | 2.130 | 2.060 | 2.183 | 2.069 | 2.118 | 2.060 | 2.034 | 2.072 | 2.074 | 2.192 |
Na | 0.364 | 0.414 | 0.348 | 0.455 | 0.371 | 0.592 | 0.482 | 0.488 | 0.505 | 0.474 | 0.566 | 0.462 | 0.642 |
K | 0.275 | 0.263 | 0.278 | 0.279 | 0.275 | 0.278 | 0.276 | 0.273 | 0.275 | 0.268 | 0.275 | 0.277 | 0.278 |
A.sum | 0.639 | 0.678 | 0.626 | 0.735 | 0.646 | 0.871 | 0.758 | 0.761 | 0.780 | 0.742 | 0.841 | 0.739 | 0.919 |
F | 0.912 | 0.587 | 0.636 | 0.618 | 0.739 | 0.543 | 0.434 | 0.972 | 0.855 | 0.758 | 0.714 | 0.782 | 0.869 |
Cl | 0.007 | 0.013 | 0.007 | 0.021 | 0.016 | 0.012 | 0.005 | 0.013 | 0.010 | 0.017 | 0.014 | 0.013 | 0.018 |
Name | Arf | Ktp | Ktp | Ktp | Ktp | Arf | Ktp | Ktp | Ktp | Ktp | Arf | Arf | Ktp |
4.4. Thermobarometeric Calculation
5. Discussion
5.1. Geochemical Characterization of the Syenitic Enclaves
5.2. Petrogenesis of the Syenitic Enclaves
5.3. Origin of the Syenitic Enclaves
5.4. Implications for the Alkaline Volcanic System
6. Conclusions
- The peralkaline felsic volcanic rocks in the Sanshui Basin commonly contain syenite and syenite porphyry enclaves. The petrological, geochemical, and mineralogical characteristics of the syenite and syenite porphyry enclaves indicated that they were cogenetic with the host trachyte and comendite and were formed by the fractional crystallization of the basaltic magma.
- The syenitic enclaves are the results of in situ crystallization of the trachytic magma in the shallow crust according to the thermobarometric calculation and petrological texture. The recharge of the basaltic magma triggered a trachytic and comenditic eruption, and the ascending trachytic and comenditic magma disaggregated the in situ syenitic crystallized crust which was brought to the surface as syenitic enclaves.
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample | 19ss036-1 | 19ss037-2a | 19ss037-2b | 20ss020-1 | 20ss022-1 | 19ss036-1 | 20ss020-1 | 20ss022-1 | Kilombe, Kenya | Azores, Portugal |
---|---|---|---|---|---|---|---|---|---|---|
Lat.(N) | 23°8′43″ | 23°8′47″ | 23°8′47″ | 23°9′45″ | 23°9′10″ | 23°8′43″ | 23°9′45″ | 23°9′10″ | ||
Lon.(E) | 112°55′22″ | 112°55′47″ | 112°55′47″ | 112°55′41″ | 112°57′15″ | 112°55′22″ | 112°55′41″ | 112°57′15″ | ||
rock type | syenite | syenite | syenite | syenite | syenite | trachyte | comendite | trachyte | syenite, n = 20 | syenite, n = 17 |
group | enclave | enclave | enclave | enclave | enclave | host | host | host | enclave | enclave |
SiO2 | 63.84 | 63.58 | 63.19 | 63.77 | 63.26 | 64.51 | 71.74 | 65.47 | 62.10 | 62.77 |
TiO2 | 0.49 | 0.46 | 0.47 | 0.44 | 0.51 | 0.36 | 0.42 | 0.31 | 0.64 | 0.62 |
Al2O3 | 17.03 | 15.77 | 16.11 | 16.56 | 16.10 | 15.66 | 12.51 | 15.55 | 15.72 | 16.89 |
FeOt | 5.09 | 6.64 | 6.60 | 5.21 | 6.46 | 4.58 | 3.81 | 4.47 | 6.12 | 3.99 |
MnO | 0.06 | 0.12 | 0.12 | 0.08 | 0.09 | 0.05 | 0.01 | 0.09 | 0.24 | 0.22 |
MgO | 0.14 | 0.28 | 0.27 | 0.17 | 0.32 | 0.10 | 0.21 | 0.09 | 0.20 | 0.57 |
CaO | 0.86 | 0.69 | 0.73 | 0.62 | 0.77 | 0.17 | 0.11 | 0.52 | 0.59 | 1.10 |
Na2O | 5.99 | 5.89 | 5.94 | 6.19 | 6.22 | 5.44 | 3.66 | 6.68 | 6.99 | 7.09 |
Na2O* | 7.06 | 7.13 | 7.23 | 6.92 | 7.15 | |||||
K2O | 4.94 | 4.87 | 4.91 | 5.02 | 5.13 | 5.37 | 5.16 | 5.41 | 5.32 | 5.29 |
P2O5 | 0.05 | 0.02 | 0.03 | 0.03 | 0.04 | 0.04 | 0.02 | 0.04 | 0.04 | 0.09 |
LOI | 1.42 | 1.34 | 1.53 | 1.71 | 1.03 | 2.74 | 1.44 | 0.44 | 1.14 | 0.61 |
Total | 99.91 | 99.66 | 99.90 | 99.80 | 99.93 | 99.02 | 99.09 | 99.07 | 99.11 | 99.23 |
P.I. | 1.00 | 1.08 | 1.07 | 0.94 | 0.98 |
Model | 14ss012-1 | 19ss036-1 | Cpx | Ol | Pl | Ap | Ilm | Mag | Odiff | Cdiff | RES |
---|---|---|---|---|---|---|---|---|---|---|---|
SiO2 | 47.41 | 64.12 | 48.56 | 38.25 | 51.39 | 0.21 | 0.28 | 0.27 | 16.72 | 16.50 | 0.22 |
TiO2 | 2.79 | 0.49 | 1.4 | 0 | 0.13 | 0.09 | 51.89 | 26.65 | −2.30 | −2.42 | 0.12 |
Al2O3 | 17.07 | 17.11 | 6.87 | 0.03 | 30.32 | 0.02 | 0.11 | 0.94 | 0.04 | 0.00 | 0.03 |
FeOt | 10.00 | 5.11 | 7.22 | 22.86 | 0.61 | 0.8 | 45.25 | 70.58 | −4.89 | −5.01 | 0.11 |
MnO | 0.15 | 0.06 | 0.13 | 0.35 | 0.01 | 0.1 | 0.74 | 1.45 | −0.09 | −0.11 | 0.02 |
MgO | 7.31 | 0.14 | 14.78 | 38.15 | 0.08 | 0.36 | 1.51 | 0.05 | −7.17 | −7.18 | 0.01 |
CaO | 8.76 | 0.86 | 20.44 | 0.24 | 12.75 | 52.24 | 0.14 | 0.03 | −7.90 | −7.87 | −0.03 |
Na2O | 3.50 | 7.09 | 0.58 | 0.06 | 4.04 | 0.09 | 0.03 | 0.03 | 3.59 | 3.62 | −0.03 |
K2O | 2.26 | 4.96 | 0.02 | 0.05 | 0.65 | 0.03 | 0.06 | 0 | 2.70 | 3.43 | −0.73 |
P2O5 | 0.74 | 0.05 | 0 | 0 | 0.03 | 46.07 | 0 | 0 | −0.69 | −0.97 | 0.28 |
Total | 100.00 | 100.00 | 100 | 100 | 100 | 100 | 100 | 100 | |||
SSR | 0.59 | ||||||||||
Wt% | 11.44 | 14.46 | 39.30 | 2.14 | 2.57 | 4.53 | 74.45 | ||||
Nb | 89.7 | 188 | 188 | 302 | 114 | ||||||
ZrS | 150 | 972 | 972 | 539 | −433 | ||||||
Sr | 874 | 22.8 | 22.8 | 3 | −19.8 | ||||||
Rb | 45.8 | 165 | 165 | 164 | −1 | ||||||
Y | 26.1 | 96 | 96 | 96 | 0 | ||||||
Ni | 90 | 0.5 | 0.5 | 0 | −0.5 | ||||||
Th | 3.8 | 19.4 | 19.4 | 14 | −5.4 |
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Chen, P.; Qian, B.; Zhou, Z.; Fang, N. Cogenetic Origin of Magmatic Enclaves in Peralkaline Felsic Volcanic Rocks from the Sanshui Basin, South China. Minerals 2023, 13, 590. https://doi.org/10.3390/min13050590
Chen P, Qian B, Zhou Z, Fang N. Cogenetic Origin of Magmatic Enclaves in Peralkaline Felsic Volcanic Rocks from the Sanshui Basin, South China. Minerals. 2023; 13(5):590. https://doi.org/10.3390/min13050590
Chicago/Turabian StyleChen, Peijia, Bo Qian, Zhiwei Zhou, and Nianqiao Fang. 2023. "Cogenetic Origin of Magmatic Enclaves in Peralkaline Felsic Volcanic Rocks from the Sanshui Basin, South China" Minerals 13, no. 5: 590. https://doi.org/10.3390/min13050590