Nanoscale Structure of Zoned Laurites from the Ojén Ultramafic Massif, Southern Spain
Abstract
:1. Introduction
2. Geological Background of the Samples
3. Methods
3.1. Sampling, Imaging and Chemical Characterization of the Platinum-Group Minerals (PGM)
3.2. Nanoscale Study of the Zoned Laurite Crystal
4. Results
4.1. Laurite Zoning Patterns in the Ojén Ultramafic Massif
4.2. Nanoscale Structure of Zoned Laurite
5. Discussion
5.1. Magmatic Origin of Laurites from the Ojén Chromitites
5.2. Nanostructure of Cores and Rims in Zoned Laurites from the Ojén Chromitites
5.3. Nanoscale Coupling of Os and As in Erlichmanite
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Grain | Phase (wt.%) | # | Os | Ir | Ru | Pt | Pd | Rh | Fe | Ni | Cu | S | As | Cr | Total |
ACA-4/1 | OsP-La | 1 | 13.81 | 13.51 | 34.93 | b.l.d | b.l.d | 1.06 | 0.76 | 0.25 | 0.04 | 30.63 | 2.33 | 2.11 | 99.43 |
ACA-4/2 | OsP-La | 2 | 21.04 | 9.25 | 34.09 | b.l.d | b.l.d | 0.37 | 0.52 | 0.08 | 0.03 | 30.76 | 1.08 | 1.18 | 98.40 |
ACA-4/5 | OsP-La | 3 | 22.48 | 7.85 | 33.41 | b.l.d | b.l.d | 0.43 | 0.71 | 0.05 | 0.03 | 30.45 | 0.79 | 1.70 | 97.90 |
ACA-4/6 | OsR-La | 4 | 22.77 | 9.79 | 23.45 | b.l.d | b.l.d | 2.33 | 0.57 | 0.05 | 0.08 | 26.86 | 3.60 | 1.44 | 90.94 |
ACA-4/9C | OsP-La | 5 | 17.26 | 8.39 | 32.68 | 0.01 | 0.26 | 4.06 | 0.67 | - | b.l.d | 29.46 | 4.09 | 1.71 | 98.60 |
ACA-4/9 | OsP-La | 6 | 21.66 | 9.09 | 30.50 | b.l.d | 0.08 | 3.78 | 0.69 | 0.02 | b.l.d | 28.92 | 4.01 | 1.71 | 100.46 |
ACA-4/9R | OsP-La | 7 | 17.31 | 6.04 | 37.23 | 0.23 | 0.14 | 3.08 | 0.73 | 0.04 | b.l.d | 31.17 | 2.23 | 1.89 | 100.09 |
ACA-4/10 | OsP-La | 8 | 5.82 | 5.46 | 44.77 | 0.35 | 0.34 | 3.68 | 0.94 | 0.05 | b.l.d | 32.47 | 1.38 | 2.59 | 97.86 |
ACA-4/14 | OsR-La | 9 | 26.33 | 9.26 | 28.61 | 0.32 | 0.37 | 1.32 | 0.61 | 0.08 | b.l.d | 29.70 | 2.51 | 1.58 | 100.69 |
ACA-4/16 | OsP-La | 10 | 21.04 | 9.25 | 34.09 | b.l.d | b.l.d | 0.37 | 0.52 | 0.08 | 0.03 | 30.76 | 1.08 | 1.18 | 98.40 |
ARC-16/4C | OsP-La | 11 | 0.01 | 0.50 | 54.66 | 0.21 | b.l.d | 5.00 | 0.39 | 0.03 | b.l.d | 35.32 | 1.62 | 1.23 | 98.97 |
ARC-16/5 | OsP-La | 12 | 25.68 | 3.21 | 32.13 | 0.65 | 0.33 | 1.12 | 0.55 | 0.03 | b.l.d | 30.45 | 1.17 | 1.68 | 97.01 |
ARC-16/6 | OsP-La | 13 | 7.97 | 0.98 | 50.99 | 0.31 | b.l.d | 1.67 | 0.47 | 0.05 | b.l.d | 34.50 | b.l.d | 1.06 | 98.00 |
ARC-16/7C | OsP-La | 14 | 0.12 | 0.28 | 53.98 | 0.38 | b.l.d | 4.54 | 0.48 | 0.02 | b.l.d | 34.25 | 1.75 | 1.48 | 97.28 |
ARC-16/7R | OsP-La | 15 | 7.34 | 0.93 | 47.54 | 0.46 | 0.25 | 3.86 | 0.56 | 0.02 | 0.02 | 33.48 | 1.73 | 1.72 | 97.91 |
ARC-16/8 | OsP-La | 16 | 16.21 | 10.14 | 32.00 | 0.02 | 0.12 | 3.80 | 0.50 | 0.06 | 0.04 | 29.18 | 5.38 | 1.44 | 98.89 |
CD-32/9 | OsR-La | 17 | 27.30 | 6.55 | 32.18 | b.l.d | 0.23 | b.l.d | 0.64 | 0.06 | b.l.d | 31.54 | b.l.d | 1.49 | 99.99 |
Apfu (atoms per formula unit) | Os | Ir | Ru | Pt | Pd | Rh | Fe | Ni | Cu | S | As | Ru/(Ru + Os) | |||
ACA-4/1 | OsP-La | 1 | 0.14 | 0.14 | 0.69 | - | - | 0.02 | 0.03 | - | - | 1.91 | 0.06 | 0.83 | |
ACA-4/2 | OsP-La | 2 | 0.22 | 0.10 | 0.68 | - | - | 0.01 | 0.02 | - | - | 1.94 | 0.03 | 0.75 | |
ACA-4/5 | OsP-La | 3 | 0.24 | 0.08 | 0.68 | - | - | 0.01 | 0.03 | - | - | 1.94 | 0.02 | 0.74 | |
ACA-4/6 | OsR-La | 4 | 0.27 | 0.12 | 0.53 | - | - | 0.05 | 0.02 | - | - | 1.90 | 0.11 | 0.66 | |
ACA-4/9C | OsP-La | 5 | 0.18 | 0.09 | 0.65 | - | - | 0.08 | 0.02 | - | - | 1.86 | 0.11 | 0.78 | |
ACA-4/9 | OsP-La | 6 | 0.23 | 0.10 | 0.62 | - | - | 0.08 | 0.03 | - | - | 1.84 | 0.11 | 0.73 | |
ACA-4/9R | OsP-La | 7 | 0.18 | 0.06 | 0.72 | - | - | 0.06 | 0.03 | - | - | 1.90 | 0.06 | 0.80 | |
ACA-4/10 | OsP-La | 8 | 0.06 | 0.05 | 0.84 | - | - | 0.07 | 0.03 | - | - | 1.91 | 0.03 | 0.94 | |
ACA-4/14 | OsR-La | 9 | 0.29 | 0.10 | 0.58 | - | - | 0.03 | 0.02 | - | - | 1.91 | 0.07 | 0.67 | |
ACA-4/16 | OsP-La | 10 | 0.22 | 0.10 | 0.68 | - | - | 0.01 | 0.02 | - | - | 1.94 | 0.03 | 0.75 | |
ARC-16/4C | OsP-La | 11 | - | - | 0.94 | - | - | 0.08 | 0.01 | - | - | 1.92 | 0.04 | 1.00 | |
ARC-16/5 | OsP-La | 12 | 0.28 | 0.03 | 0.65 | 0.01 | - | 0.02 | 0.02 | - | - | 1.95 | 0.03 | 0.70 | |
ARC-16/6 | OsP-La | 13 | 0.08 | 0.01 | 0.91 | - | - | 0.03 | 0.02 | - | - | 1.95 | - | 0.92 | |
ARC-16/7C | OsP-La | 14 | - | - | 0.95 | - | - | 0.08 | 0.02 | - | - | 1.90 | 0.04 | 1.00 | |
ARC-16/7R | OsP-La | 15 | 0.07 | 0.01 | 0.87 | - | - | 0.07 | 0.02 | - | - | 1.92 | 0.04 | 0.92 | |
ARC-16/8 | OsP-La | 16 | 0.17 | 0.11 | 0.64 | - | - | 0.07 | 0.02 | - | - | 1.84 | 0.15 | 0.79 | |
CD-32/9 | OsR-La | 17 | 0.29 | 0.07 | 0.64 | - | - | - | 0.02 | - | - | 1.98 | - | 0.69 |
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Baurier-Aymat, S.; Jiménez-Franco, A.; Roqué-Rosell, J.; González-Jiménez, J.M.; Gervilla, F.; Proenza, J.A.; Mendoza, J.; Nieto, F. Nanoscale Structure of Zoned Laurites from the Ojén Ultramafic Massif, Southern Spain. Minerals 2019, 9, 288. https://doi.org/10.3390/min9050288
Baurier-Aymat S, Jiménez-Franco A, Roqué-Rosell J, González-Jiménez JM, Gervilla F, Proenza JA, Mendoza J, Nieto F. Nanoscale Structure of Zoned Laurites from the Ojén Ultramafic Massif, Southern Spain. Minerals. 2019; 9(5):288. https://doi.org/10.3390/min9050288
Chicago/Turabian StyleBaurier-Aymat, Sandra, Abigail Jiménez-Franco, Josep Roqué-Rosell, José María González-Jiménez, Fernando Gervilla, Joaquín A. Proenza, Joan Mendoza, and Fernando Nieto. 2019. "Nanoscale Structure of Zoned Laurites from the Ojén Ultramafic Massif, Southern Spain" Minerals 9, no. 5: 288. https://doi.org/10.3390/min9050288