Magma Mingling in Kimberlites: Evidence from the Groundmass Cocrystallization of Two Spinel-Group Minerals
Abstract
:1. Introduction
2. Geological Setting
3. Methods
4. Textural Descriptions
5. Mineral Chemistry
6. The U–Pb Age of Rutile
7. Discussion
7.1. Paragenetic Sequence
7.2. Magma Mingling Revealed by the Coexistence of Two Spinels in the Groundmass
7.3. Volatiles in the Kimberlitic Melt
8. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Type | MUM-g | MUM-g | MUM-r | MUM-r | Sp-o | Sp-o | Sp-g | Sp-g |
---|---|---|---|---|---|---|---|---|
wt.% | ||||||||
SiO2 | bdl | bdl | 0.06 | 0.02 | bdl | 0.12 | bdl | 0.11 |
Al2O3 | 2.62 | 9.94 | 7.86 | 7.54 | 52.33 | 58.92 | 59.05 | 57.00 |
MgO | 14.39 | 18.19 | 28.11 | 26.26 | 21.09 | 22.31 | 21.99 | 21.58 |
ZnO | 0.06 | bdl | bdl | bdl | bdl | 0.05 | 0.04 | 0.07 |
FeO | 25.58 | 20.13 | 13.71 | 17.53 | 8.73 | 6.90 | 7.35 | 8.34 |
Fe2O3 | 36.00 | 32.36 | 20.42 | 17.21 | 6.00 | 5.54 | 5.31 | 5.22 |
MnO | 0.33 | 0.40 | 0.49 | 0.52 | 0.09 | 0.10 | 0.11 | 0.07 |
V2O3 | 0.57 | 0.60 | 0.28 | 0.30 | 0.22 | 0.17 | 0.17 | 0.20 |
Cr2O3 | 1.15 | 0.43 | 1.32 | 1.87 | 9.28 | 3.33 | 3.52 | 4.59 |
TiO2 | 18.36 | 17.34 | 26.99 | 28.14 | 1.19 | 0.66 | 0.80 | 1.20 |
Nb2O5 | 0.07 | 0.02 | 0.11 | 0.05 | 0.05 | bdl | bdl | bdl |
ZrO2 | bdl | bdl | 0.17 | 0.20 | bdl | bdl | bdl | bdl |
NiO | 0.28 | 0.16 | 0.09 | 0.12 | 0.16 | 0.17 | 0.16 | 0.16 |
CaO | 0.16 | 0.19 | 0.14 | 0.08 | 0.08 | 0.16 | 0.46 | 0.16 |
Total | 99.58 | 99.79 | 99.73 | 99.87 | 99.39 | 98.43 | 99.06 | 98.75 |
apfu | Cations on the basis of 4 O atoms | |||||||
Si | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Al | 0.10 | 0.37 | 0.28 | 0.27 | 1.63 | 1.79 | 1.79 | 1.75 |
Mg | 0.72 | 0.86 | 1.25 | 1.18 | 0.83 | 0.86 | 0.84 | 0.84 |
Zn | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe2+ | 0.72 | 0.53 | 0.34 | 0.44 | 0.19 | 0.15 | 0.16 | 0.18 |
Fe3+ | 0.91 | 0.77 | 0.46 | 0.39 | 0.12 | 0.11 | 0.10 | 0.10 |
Mn | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 |
V | 0.02 | 0.02 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 |
Cr | 0.03 | 0.01 | 0.03 | 0.04 | 0.19 | 0.07 | 0.07 | 0.09 |
Ti | 0.47 | 0.41 | 0.61 | 0.64 | 0.02 | 0.01 | 0.02 | 0.02 |
Nb | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Zr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Ni | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Ca | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 |
MgAl2O4 | 5.26 | 18.75 | 13.98 | 13.54 | 81.90 | 89.51 | 89.15 | 87.30 |
Fe3O4 | 46.15 | 38.97 | 23.19 | 19.73 | 5.99 | 5.61 | 5.44 | 5.33 |
Mg2TiO4 | 33.41 | 33.79 | 55.06 | 51.64 | 2.37 | 1.34 | 1.63 | 2.45 |
Mn2TiO4 | 0.47 | 0.54 | 0.61 | 0.66 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe2TiO4 | 13.17 | 7.40 | 5.58 | 12.18 | 0.00 | 0.00 | 0.00 | 0.00 |
FeCr2O4 | 1.55 | 0.55 | 1.58 | 2.25 | 9.74 | 3.54 | 3.78 | 4.92 |
MnCr2O4 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
MgCr2O4 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0.00 | 0.00 |
Mineral | Ilmenite | Rutile | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Type | 1 | 2 | 3 | 4a | 4b | 4c | 1 | 1 | 2 | 2 | 3 | 3 |
wt.% | ||||||||||||
SiO2 | bdl | bdl | 0.05 | bdl | bdl | 0.10 | 0.05 | 0.08 | bdl | bdl | bdl | 0.03 |
Al2O3 | 0.39 | 0.29 | 0.53 | 0.35 | 0.04 | 0.03 | bdl | bdl | bdl | bdl | bdl | bdl |
MgO | 13.96 | 12.88 | 16.08 | 17.49 | 26.00 | 23.65 | 0.62 | 0.15 | bdl | 0.11 | 0.12 | bdl |
ZnO | bdl | bdl | bdl | bdl | bdl | bdl | 0.73 | 0.84 | 0.21 | 0.17 | 0.40 | 0.30 |
FeO | 23.71 | 25.18 | 20.26 | 19.15 | 7.39 | 11.30 | bdl | bdl | bdl | bdl | bdl | bdl |
Fe2O3 | 4.82 | 5.35 | 4.51 | 4.27 | bdl | bdl | - | - | - | - | - | - |
MnO | 0.32 | 0.29 | 0.27 | 0.33 | 0.56 | 0.44 | bdl | bdl | bdl | bdl | bdl | bdl |
V2O3 | 0.60 | 0.68 | 0.55 | 0.62 | 0.58 | 0.57 | 0.75 | 0.86 | 0.68 | 0.78 | 0.59 | 0.68 |
Cr2O3 | 1.18 | 0.76 | 2.41 | 1.16 | 3.28 | 1.61 | 1.55 | 4.45 | 1.18 | 2.98 | 0.84 | 1.16 |
TiO2 | 54.61 | 53.74 | 54.87 | 56.32 | 61.60 | 62.36 | 94.83 | 91.46 | 96.60 | 94.45 | 97.49 | 96.60 |
Nb2O5 | 0.07 | 0.23 | 0.09 | 0.11 | 0.17 | 0.30 | 1.31 | 1.62 | 1.05 | 1.72 | 0.90 | 1.16 |
ZrO2 | 0.07 | bdl | 0.10 | bdl | 0.06 | 0.06 | 0.14 | 0.24 | 0.30 | 0.31 | 0.22 | 0.27 |
NiO | 0.17 | 0.13 | 0.13 | 0.10 | 0.05 | 0.09 | 0.03 | 0.03 | 0.02 | bdl | bdl | bdl |
CaO | 0.13 | 0.03 | 0.19 | 0.03 | 0.12 | 0.01 | 0.05 | 0.01 | 0.07 | 0.05 | 0.27 | 0.09 |
Total | 100.06 | 99.63 | 100.04 | 100.00 | 99.86 | 100.51 | 100.10 | 99.77 | 100.16 | 100.62 | 100.86 | 100.35 |
apfu | Cations on the basis of 3 O atoms | Cations on the basis of 2 O atoms | ||||||||||
Si | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Al | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Mg | 0.47 | 0.44 | 0.54 | 0.58 | 0.81 | 0.75 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Zn | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe2+ | 0.45 | 0.49 | 0.38 | 0.36 | 0.13 | 0.20 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe3+ | 0.08 | 0.09 | 0.08 | 0.07 | 0.00 | 0.00 | - | - | - | - | - | - |
Mn | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
V | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
Cr | 0.02 | 0.01 | 0.04 | 0.02 | 0.05 | 0.03 | 0.02 | 0.05 | 0.01 | 0.03 | 0.01 | 0.01 |
Ti | 0.94 | 0.93 | 0.93 | 0.94 | 0.97 | 1.00 | 0.96 | 0.94 | 0.97 | 0.95 | 0.97 | 0.97 |
Nb | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
Zr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Ni | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Ca | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Total | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 1.02 | 1.02 | 1.01 | 1.01 | 1.01 | 1.01 |
Fe2+/(Mg + Fe2+) | 0.15 | 0.17 | 0.12 | 0.11 | 0.00 | 0.00 | - | - | - | - | - | - |
Mn/(Mn + Fe2+ + Mg) | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | - | - | - | - | - | - |
FeTiO3 | 46.42 | 49.54 | 39.55 | 36.42 | 13.61 | 20.97 | - | - | - | - | - | - |
Fe2O3 | 4.24 | 4.74 | 3.97 | 3.66 | 0.00 | 0.00 | - | - | - | - | - | - |
MnTiO3 | 0.64 | 0.58 | 0.54 | 0.63 | 1.05 | 0.82 | - | - | - | - | - | - |
MgTiO3 | 48.69 | 45.15 | 55.95 | 59.29 | 85.34 | 78.21 | - | - | - | - | - | - |
Sample | 9352-B_dj | 9352-B_dj | 9352-B_dj | 9352-U_dj | 9352-R_dj | 9352-R_dj |
---|---|---|---|---|---|---|
No. | #3 | #4 | #6 | #17 | #26 | #28 |
wt.% | ||||||
Si | 0.03 | bdl | bdl | bdl | bdl | 0.02 |
Al | 0.01 | bdl | 0.02 | 0.02 | 0.01 | 0.01 |
Ca | 0.04 | bdl | 0.02 | 0.06 | 0.04 | 0.03 |
K | 8.99 | 8.85 | 8.83 | 8.95 | 8.99 | 8.93 |
Mg | bdl | 0.03 | bdl | bdl | bdl | 0.02 |
Na | 0.03 | bdl | 0.07 | 0.07 | 0.05 | bdl |
Cu | 1.23 | 1.31 | 1.16 | 3.04 | 1.61 | 2.05 |
Ni | 16.61 | 16.33 | 16.42 | 12.96 | 18.33 | 17.77 |
Co | 0.52 | 0.48 | 0.51 | 0.16 | 0.27 | 0.24 |
Fe | 37.98 | 37.85 | 38.06 | 39.01 | 35.68 | 35.64 |
Pb | 0.33 | 0.35 | 0.36 | 0.32 | 0.36 | 0.32 |
S | 32.69 | 32.60 | 32.61 | 32.63 | 32.65 | 32.66 |
Cl | 1.36 | 1.39 | 1.39 | 1.38 | 1.39 | 1.41 |
Total | 99.82 | 99.20 | 99.45 | 98.60 | 99.37 | 99.10 |
apfu | Cations on the basis of 26 S | |||||
Si | 0.03 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 |
Al | 0.01 | 0.00 | 0.01 | 0.02 | 0.01 | 0.01 |
Ca | 0.03 | 0.00 | 0.01 | 0.04 | 0.03 | 0.02 |
K | 5.86 | 5.79 | 5.77 | 5.85 | 5.87 | 5.83 |
Mg | 0.00 | 0.03 | 0.00 | 0.00 | 0.00 | 0.02 |
Na | 0.03 | 0.00 | 0.07 | 0.08 | 0.05 | 0.00 |
Cu | 0.49 | 0.53 | 0.47 | 1.22 | 0.65 | 0.82 |
Ni | 7.22 | 7.12 | 7.15 | 5.64 | 7.97 | 7.73 |
Co | 0.23 | 0.21 | 0.22 | 0.07 | 0.12 | 0.10 |
Pb | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 |
Fe | 17.34 | 17.33 | 17.42 | 17.85 | 16.31 | 16.29 |
S | 26.00 | 26.00 | 26.00 | 26.00 | 26.00 | 26.00 |
Cl | 0.98 | 1.00 | 1.00 | 0.99 | 1.00 | 1.02 |
Analysis | U | Th/U | TW Concordia Columns (Uncorrect) | 207Pb Correction | f206 | |||||
---|---|---|---|---|---|---|---|---|---|---|
ppm | 238U/206Pb | Error (%) | 207Pb/206Pb | Error (%) | Age (Ma) | Error (Ma) | ||||
9352-D_rt@1 | 5.5 | 0.051 | 34.40 | 2.5 | 0.1424 | 5.7 | 0.12 | 164 | 6 | 0.12 |
9352-D_rt@2 | 5.3 | 0.051 | 34.72 | 2.9 | 0.1262 | 3.8 | 0.10 | 166 | 6 | 0.10 |
9352-D_rt@3 | 5.2 | 0.052 | 34.47 | 2.4 | 0.0983 | 5.3 | 0.06 | 173 | 5 | 0.06 |
9352-D_rt@4 | 5.2 | 0.051 | 35.68 | 2.6 | 0.0817 | 4.1 | 0.04 | 171 | 5 | 0.04 |
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Xu, J.; Melgarejo, J.C.; Li, Q.; Abat, L.T.i.; Castillo-Oliver, M. Magma Mingling in Kimberlites: Evidence from the Groundmass Cocrystallization of Two Spinel-Group Minerals. Minerals 2020, 10, 829. https://doi.org/10.3390/min10090829
Xu J, Melgarejo JC, Li Q, Abat LTi, Castillo-Oliver M. Magma Mingling in Kimberlites: Evidence from the Groundmass Cocrystallization of Two Spinel-Group Minerals. Minerals. 2020; 10(9):829. https://doi.org/10.3390/min10090829
Chicago/Turabian StyleXu, Jingyao, Joan Carles Melgarejo, Qiuli Li, Lisard Torró i Abat, and Montgarri Castillo-Oliver. 2020. "Magma Mingling in Kimberlites: Evidence from the Groundmass Cocrystallization of Two Spinel-Group Minerals" Minerals 10, no. 9: 829. https://doi.org/10.3390/min10090829