Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites
Abstract
:1. Introduction
2. Geological Background
3. Samples and Analytical Methods
4. Results
4.1. Mineral Chemistry
4.2. 40Ar/39Ar Age
5. Discussion
5.1. Argon Release Pattern
5.2. Reliability of the Age
5.3. ~30 Ma Magmatism in Southern Tibet
5.4. Formation of the Hydrothermal Minerals and Source of the Fluids
5.5. Possible Circulating Ways of the Fluids
6. Conclusive Summary and Implications
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Mineral: | Chrome Chlorite | Calcite | Dolomite | ||||||
---|---|---|---|---|---|---|---|---|---|
Provenance: | This study | Huang et al. [57] | This study | This study | |||||
Sample: | L6 and L7 | KJchrXA | KJchr1XA | L6 | L6 | ||||
Form: | Vein and inclusion | Vein | Inclusion | Euhedral crystal | |||||
range (n = 11) | mean | std_err | mean (n = 9) | n = 1 | 1 | 2 | 1 | 2 | |
Na2O | 0.02–0.12 | 0.05 | 0.03 | 0.02 | 0.00 | 0.00 | 0.03 | 0.03 | 0.03 |
Cr2O3 | 0.10–7.43 | 4.72 | 1.90 | 5.08 | 5.30 | 0.00 | 0.00 | 0.02 | 0.00 |
K2O | 0.01–0.12 | 0.03 | 0.03 | 0.01 | 0.02 | 0.00 | 0.01 | 0.01 | 0.00 |
MgO | 33.84–35.52 | 34.26 | 0.44 | 32.56 | 30.31 | 0.16 | 0.11 | 23.30 | 22.03 |
MnO | 0.00–0.03 | 0.01 | 0.01 | 0.02 | 0.00 | 0.02 | 0.00 | 0.00 | 0.00 |
CaO | 0.01–0.04 | 0.02 | 0.01 | 0.03 | 0.04 | 59.78 | 58.70 | 28.91 | 30.19 |
Al2O3 | 9.06–19.05 | 11.85 | 2.44 | 11.20 | 12.84 | 0.00 | 0.00 | 0.00 | 0.00 |
FeO | 0.26–1.98 | 0.77 | 0.55 | 0.77 | 0.66 | 0.06 | 0.04 | 0.03 | 0.00 |
TiO2 | 0.00–0.02 | 0.01 | 0.01 | 0.06 | 0.06 | 0.01 | 0.00 | 0.03 | 0.00 |
SiO2 | 31.90–34.58 | 33.15 | 0.78 | 33.11 | 30.88 | 0.00 | 0.03 | 0.00 | 0.00 |
NiO | 0.01–0.59 | 0.37 | 0.20 | 0.42 | 0.50 | 0.00 | 0.02 | 0.01 | 0.00 |
ZnO | 0.00–0.06 | 0.01 | 0.02 | 0.00 | 0.00 | 0.01 | 0.00 | ||
H2O | 12.13 | 11.73 | |||||||
Total | 83.97–86.00 | 85.25 | 0.70 | 95.41 | 92.34 | 60.03 | 58.94 | 52.33 | 52.25 |
X-ray Single-Crystal Diffraction | X-ray Powder Diffraction | ||||
---|---|---|---|---|---|
Luobusa (This Study) | Byrapur, India b | California b | |||
d (Å) | Intensity a | d (Å) | Intensity | d (Å) | Intensity |
14.18 | 14.25 | 39.5 | 14.15 | 37.0 | |
7.24 | 7.19 | 96.0 | 7.11 | 95.2 | |
4.63 | 4.79 | 92.0 | 4.741 | 92.6 | |
3.59 | 4.58 | 4.0 | 4.581 | 7.0 | |
2.86 | 3.91 | 4.0 | 3.931 | 2.0 | |
2.64 | 3.59 | 93.5 | 3.561 | 93.5 | |
2.57 | 2.86 | 26.5 | 2.847 | 24.9 | |
2.39 | 2.58 | 11.0 | 2.583 | 5.7 | |
2.08 | 2.53 | 3.0 | 2.538 | 9.3 | |
2.01 | 2.42 | 6.0 | 2.44 | 7.2 | |
1.90 | 2.33 | 3.0 | 2.377 | 4.1 | |
1.89 | 2.26 | 4.0 | 2.322 | 2.0 | |
1.72 | 2.04 | 3.5 | 2.26 | 3.3 | |
1.67 | 2.01 | 3.0 | 2.033 | 7.1 | |
1.58 | 2.00 | 3.0 | 2.003 | 7.9 | |
1.55 | 1.87 | 3.5 | 1.883 | 3.2 | |
1.51 | 1.84 | 5.0 | 1.825 | 2.9 | |
1.42 | 1.72 | 4.0 | 1.803 | 1.5 | |
1.33 | 1.62 | 3.0 | 1.711 | 1.3 | |
1.29 | 1.57 | 7.0 | 1.666 | 1.8 | |
1.50 | 9.0 | 1.569 | 6.0 | ||
1.49 | 2.5 | 1.537 | 6.1 | ||
1.52 | 2.8 | 1.501 | 2.3 | ||
1.425 | 2.8 | ||||
1.396 | 5.7 |
Step | Laser Power (%) | 39Ar Cum. (%) | 40Ar* (%) | 39Ar/40Ar ± 2σ (10−2) | 36Ar/40Ar ± 2σ (10−3) | 40Ar*/39Ar ± 2σ | Apparent Age ± 2σ (Ma) | K/Ca |
---|---|---|---|---|---|---|---|---|
1 | 2.8 | 0.61 | 17.14 | 0.57 ± 0.01 | 2.78 ± 0.06 | 29.80 ± 3.30 | 249.62 ± 25.80 | 0.26 |
2 | 3.2 | 1.63 | 18.93 | 1.44 ± 0.01 | 2.72 ± 0.07 | 13.12 ± 1.42 | 114.14 ± 12.01 | 0.23 |
3 | 3.6 | 4.04 | 19.51 | 1.82 ± 0.01 | 2.70 ± 0.08 | 10.74 ± 1.35 | 93.96 ± 11.54 | 0.27 |
4 | 4.0 | 17.83 | 43.70 | 12.99 ± 0.05 | 1.89 ± 0.06 | 3.36 ± 0.13 | 29.97 ± 1.18 | 0.22 |
5 | 4.5 | 15.42 | 53.84 | 16.07 ± 0.07 | 1.55 ± 0.03 | 3.35 ± 0.06 | 29.85 ± 0.53 | 0.24 |
6 | 5.0 | 9.13 | 53.15 | 15.74 ± 0.07 | 1.57 ± 0.05 | 3.38 ± 0.10 | 30.08 ± 0.91 | 0.25 |
7 | 5.6 | 12.24 | 57.75 | 17.19 ± 0.07 | 1.41 ± 0.06 | 3.36 ± 0.10 | 29.93 ± 0.86 | 0.24 |
8 | 6.4 | 6.62 | 35.04 | 10.56 ± 0.05 | 2.18 ± 0.08 | 3.32 ± 0.23 | 29.56 ± 2.05 | 0.20 |
9 | 7.0 | 6.52 | 34.82 | 10.42 ± 0.05 | 2.18 ± 0.07 | 3.34 ± 0.21 | 29.77 ± 1.84 | 0.17 |
10 | 8.0 | 6.82 | 30.61 | 9.30 ± 0.04 | 2.32 ± 0.07 | 3.29 ± 0.21 | 29.32 ± 1.90 | 0.17 |
11 | 10.0 | 9.86 | 28.81 | 8.02 ± 0.03 | 2.38 ± 0.05 | 3.59 ± 0.19 | 31.97 ± 1.69 | 0.08 |
12 | 15.0 | 9.28 | 28.72 | 5.47 ± 0.02 | 2.39 ± 0.05 | 5.25 ± 0.29 | 46.57 ± 2.54 | 0.05 |
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Guo, W.; He, H.; Li, Y.; Bai, X.; Su, F.; Liu, Y.; Zhu, R. Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites. Minerals 2018, 8, 230. https://doi.org/10.3390/min8060230
Guo W, He H, Li Y, Bai X, Su F, Liu Y, Zhu R. Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites. Minerals. 2018; 8(6):230. https://doi.org/10.3390/min8060230
Chicago/Turabian StyleGuo, Wei, Huaiyu He, Youjuan Li, Xiujuan Bai, Fei Su, Yan Liu, and Rixiang Zhu. 2018. "Timing of Secondary Hydrothermal Alteration of the Luobusa Chromitites Constrained by Ar/Ar Dating of Chrome Chlorites" Minerals 8, no. 6: 230. https://doi.org/10.3390/min8060230