Metamorphic Conditions and Raman Spectroscopic Carbonaceous Material Thermometry of Host Schists of Olympiada and Eldorado Gold Deposits (Yenisey Ridge, Russia)
Abstract
:1. Introduction
2. Regional Geology and Metallogeny of the Yenisey Ridge
3. Geology of Deposits
4. Materials and Methods
5. Results
5.1. Petrography and Mineralogy
5.2. P-T Parameters of Metamorphism
5.3. Chlorite Thermometry
5.4. Raman Spectroscopy
5.5. Ar-Ar Dating
6. Discussion
6.1. P-T Conditions of Metamorphism
6.2. Carbonaceous Material Thermometry
6.3. Ar-Ar Dating
6.4. Correlation of the Mineralization Periods with the Main Tectonomagmatic Events
7. Conclusions
- (1)
- The host rocks of both Olympiada and Eldorado gold deposits are metamorphosed during the single episode of Barrovian-type metamorphism at similar temperatures 530–570 °C. The rocks do not indicate any traces of the early HT/LP metamorphism observed in other areas of the YK. The growth of the late chlorite after peak metamorphic minerals occurred at temperatures higher than 350 °C probably during retrograde metamorphism.
- (2)
- Carbonaceous material thermometry indicates a wide range of obtained temperatures around 90–150 °C for each sample. The highest temperatures are close to the peak metamorphic temperatures estimated by garnet-biotite thermometry. We guess that thermometry using Raman spectroscopy of carbonaceous material is a reliable tool for temperature estimates, but it can only be used if there is a sufficiently large number of analyzes.
- (3)
- The new 39/40Ar age data on ore-forming processes of the Eldorado deposit around 796 Ma are very close to the age of the Barrovian-type metamorphism estimated in the area under study and around the whole Yenisey ridge. This may indicate their genetic affinity.
- (4)
- The review of magmatic and metamorphic events and ore-forming processes of Yenisey ridge indicate that the most productive ore stage (gold-sulfide-quartz) have a good time correlation with the regional metamorphism of Barrovian type. This indicates that metamorphic processes can play a key role in forming of gold deposits of the Yenisey ridge.
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Sample | OC-24 | OC-40 | OC-99 | 19-EL-2 | 19-EL-5 | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Grt r | Grt c | Grt r | Ms | Cld | St | Grt 1 r | Grt 1 c | Grt 1 r | Pl | Grt r | Grt c | Grt r | Pl | Grt r | Grt c | Grt r | Ms | Pl | Grt r | Grt c | Grt r | Ms | Pl | |
SiO2 | 36.97 | 37.11 | 37.23 | 46.88 | 24.62 | 28.43 | 36.74 | 37.29 | 37.38 | 58.66 | 37.09 | 36.67 | 36.83 | 62.03 | 36.97 | 36.99 | 37.10 | 46.61 | 63.99 | 36.88 | 36.63 | 36.96 | 46.16 | 64.44 |
TiO2 | 0.07 | 0.06 | 0.02 | 0.31 | 0.02 | 0.42 | 0.06 | 0.12 | 0.06 | 0.01 | 0.03 | 0.14 | 0.04 | 0.01 | 0.02 | 0.05 | 0.02 | 0.28 | 0.00 | 0.00 | 0.06 | 0.04 | 0.38 | 0.00 |
Al2O3 | 20.89 | 20.79 | 21.25 | 35.43 | 40.88 | 54.70 | 20.63 | 20.54 | 20.58 | 25.79 | 20.63 | 20.30 | 20.50 | 23.89 | 20.47 | 20.54 | 20.81 | 35.55 | 21.59 | 20.61 | 20.37 | 20.22 | 35.43 | 21.83 |
Cr2O3 | 0.00 | 0.00 | 0.03 | 0.03 | 0.03 | 0.04 | 0.04 | 0.00 | 0.00 | 0.01 | 0.01 | 0.03 | 0.02 | 0.01 | 0.02 | 0.00 | 0.01 | 0.02 | 0.00 | 0.00 | 0.01 | 0.03 | 0.01 | 0.00 |
FeO | 36.31 | 34.44 | 35.77 | 1.18 | 25.23 | 12.48 | 28.38 | 21.40 | 27.71 | 0.14 | 34.16 | 26.58 | 34.39 | 0.14 | 36.68 | 29.83 | 35.31 | 1.08 | 0.04 | 35.26 | 28.90 | 36.69 | 1.85 | 0.07 |
MnO | 0.25 | 1.98 | 0.22 | 0.01 | 0.03 | 0.01 | 6.35 | 15.12 | 7.01 | 0.01 | 2.48 | 11.22 | 1.68 | 0.00 | 2.00 | 9.24 | 3.45 | 0.01 | 0.00 | 2.91 | 11.67 | 2.28 | 0.00 | 0.00 |
MgO | 2.36 | 1.42 | 1.93 | 0.60 | 2.62 | 0.91 | 1.39 | 0.70 | 1.29 | 0.00 | 1.58 | 1.02 | 1.63 | 0.00 | 1.95 | 1.32 | 1.74 | 0.56 | 0.00 | 1.60 | 1.16 | 1.92 | 0.73 | 0.00 |
CaO | 3.30 | 4.49 | 3.34 | 0.00 | 0.01 | 0.01 | 6.00 | 5.18 | 5.90 | 7.92 | 4.04 | 3.25 | 4.23 | 5.24 | 1.96 | 1.89 | 2.18 | 0.00 | 4.09 | 2.88 | 0.91 | 2.33 | 0.00 | 4.10 |
Na2O | 0.06 | 0.10 | 0.06 | 1.26 | 0.03 | 0.01 | 0.05 | 0.00 | 0.00 | 7.28 | 0.07 | 0.10 | 0.03 | 8.50 | 0.02 | 0.01 | 0.02 | 0.92 | 10.28 | 0.04 | 0.01 | 0.06 | 1.13 | 9.49 |
K2O | 0.02 | 0.00 | 0.23 | 8.67 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.08 | 0.00 | 0.00 | 0.00 | 0.06 | 0.00 | 0.00 | 0.00 | 10.02 | 0.05 | 0.00 | 0.01 | 0.00 | 9.79 | 0.05 |
ZnO | 0.45 | |||||||||||||||||||||||
Mole fractions and formula units | ||||||||||||||||||||||||
Si | 2.98 | 3.00 | 3.00 | 3.12 | 2.01 | 8.20 | 2.98 | 3.02 | 3.02 | 2.63 | 3.00 | 3.01 | 3.00 | 2.75 | 3.01 | 3.02 | 3.00 | 3.10 | 2.83 | 3.00 | 3.01 | 3.00 | 3.07 | 2.85 |
Ti | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.09 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 |
Al | 1.99 | 1.98 | 2.02 | 2.78 | 3.94 | 18.60 | 1.97 | 1.96 | 1.96 | 1.36 | 1.97 | 1.96 | 1.97 | 1.25 | 1.96 | 1.97 | 1.98 | 2.78 | 1.13 | 1.97 | 1.97 | 1.94 | 2.78 | 1.14 |
Cr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe | 2.45 | 2.33 | 2.41 | 0.07 | 1.73 | 3.01 | 1.93 | 1.45 | 1.87 | 0.01 | 2.31 | 1.82 | 2.35 | 0.01 | 2.49 | 2.03 | 2.39 | 0.06 | 0.00 | 2.40 | 1.98 | 2.49 | 0.10 | 0.00 |
Mn | 0.02 | 0.14 | 0.02 | 0.00 | 0.00 | 0.00 | 0.44 | 1.04 | 0.48 | 0.00 | 0.17 | 0.78 | 0.12 | 0.00 | 0.14 | 0.64 | 0.24 | 0.00 | 0.00 | 0.20 | 0.81 | 0.16 | 0.00 | 0.00 |
Mg | 0.28 | 0.17 | 0.23 | 0.06 | 0.32 | 0.39 | 0.17 | 0.08 | 0.16 | 0.00 | 0.19 | 0.13 | 0.20 | 0.00 | 0.24 | 0.16 | 0.21 | 0.06 | 0.00 | 0.19 | 0.14 | 0.23 | 0.07 | 0.00 |
Ca | 0.29 | 0.39 | 0.29 | 0.00 | 0.00 | 0.00 | 0.52 | 0.45 | 0.51 | 0.38 | 0.35 | 0.29 | 0.37 | 0.25 | 0.17 | 0.17 | 0.19 | 0.00 | 0.19 | 0.25 | 0.08 | 0.20 | 0.00 | 0.19 |
Na | 0.01 | 0.01 | 0.01 | 0.16 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.63 | 0.01 | 0.02 | 0.00 | 0.73 | 0.00 | 0.00 | 0.00 | 0.12 | 0.88 | 0.01 | 0.00 | 0.01 | 0.15 | 0.81 |
K | 0.00 | 0.00 | 0.02 | 0.74 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.85 | 0.00 | 0.00 | 0.00 | 0.00 | 0.83 | 0.00 |
Zn | 0.10 | |||||||||||||||||||||||
F | 0.90 | 0.93 | 0.91 | 0.84 | 0.89 | 0.92 | 0.95 | 0.92 | 0.92 | 0.94 | 0.92 | 0.91 | 0.93 | 0.92 | ||||||||||
xAlm | 0.81 | 0.77 | 0.82 | 0.63 | 0.48 | 0.62 | 0.76 | 0.60 | 0.77 | 0.82 | 0.68 | 0.79 | 0.79 | 0.66 | 0.81 | |||||||||
xPrp/xAn | 0.09 | 0.06 | 0.08 | 0.06 | 0.03 | 0.05 | 0.37 | 0.06 | 0.04 | 0.07 | 0.25 | 0.08 | 0.05 | 0.07 | 0.18 | 0.06 | 0.05 | 0.08 | 0.19 | |||||
xGrs/xAb | 0.09 | 0.13 | 0.10 | 0.17 | 0.15 | 0.17 | 0.62 | 0.12 | 0.09 | 0.12 | 0.74 | 0.06 | 0.06 | 0.06 | 0.82 | 0.08 | 0.03 | 0.07 | 0.81 | |||||
xSps/xOrt | 0.01 | 0.04 | 0.01 | 0.14 | 0.34 | 0.16 | 0.00 | 0.06 | 0.26 | 0.04 | 0.00 | 0.05 | 0.21 | 0.08 | 0.00 | 0.07 | 0.27 | 0.05 | 0.00 |
Sample | OC-24 | OC-40 | OC-99 | 19-El-2 | 19-El-5 | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 | 6 | 1 | 2 | 3 | 4 | 5 | |
SiO2 | 35.18 | 35.68 | 36.07 | 36.08 | 36.24 | 36.54 | 36.84 | 36.43 | 36.75 | 36.78 | 36.12 | 35.91 | 36.16 | 36.07 | 35.62 | 35.17 | 35.35 | 35.46 | 34.93 | 35.14 | 35.99 | 34.75 | 35.00 | 35.69 | 35.23 | 34.24 |
TiO2 | 1.62 | 1.50 | 1.47 | 1.41 | 1.40 | 1.83 | 1.75 | 1.73 | 1.82 | 1.78 | 1.84 | 1.84 | 1.84 | 1.97 | 1.83 | 1.68 | 1.65 | 1.63 | 1.68 | 1.70 | 1.66 | 1.68 | 1.66 | 1.64 | 1.59 | 1.65 |
Al2O3 | 18.58 | 18.81 | 19.16 | 19.04 | 18.93 | 17.49 | 17.98 | 18.11 | 17.74 | 17.89 | 18.39 | 18.34 | 18.39 | 18.33 | 18.26 | 18.60 | 18.71 | 18.83 | 18.69 | 18.78 | 18.88 | 18.30 | 18.28 | 18.48 | 18.73 | 18.51 |
Cr2O3 | 0.00 | 0.04 | 0.01 | 0.01 | 0.02 | 0.02 | 0.05 | 0.07 | 0.05 | 0.05 | 0.02 | 0.02 | 0.03 | 0.04 | 0.03 | 0.09 | 0.04 | 0.06 | 0.05 | 0.02 | 0.13 | 0.02 | 0.02 | 0.00 | 0.01 | 0.02 |
FeO | 23.82 | 21.56 | 21.36 | 21.21 | 21.27 | 20.14 | 19.74 | 20.20 | 19.58 | 20.29 | 22.86 | 23.01 | 22.69 | 22.95 | 23.45 | 22.13 | 22.02 | 21.95 | 22.55 | 22.21 | 22.03 | 23.63 | 23.48 | 22.92 | 23.15 | 23.61 |
MnO | 0.01 | 0.00 | 0.01 | 0.01 | 0.02 | 0.26 | 0.28 | 0.30 | 0.27 | 0.28 | 0.11 | 0.11 | 0.10 | 0.08 | 0.11 | 0.03 | 0.05 | 0.04 | 0.03 | 0.05 | 0.05 | 0.04 | 0.05 | 0.04 | 0.03 | 0.04 |
MgO | 8.41 | 9.54 | 9.36 | 9.49 | 9.56 | 9.73 | 10.07 | 10.05 | 10.05 | 9.82 | 7.43 | 7.64 | 7.54 | 7.59 | 7.79 | 8.15 | 8.16 | 8.16 | 8.22 | 8.34 | 8.00 | 7.11 | 7.21 | 7.30 | 7.46 | 7.33 |
CaO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 |
Na2O | 0.03 | 0.25 | 0.28 | 0.31 | 0.26 | 0.06 | 0.03 | 0.08 | 0.02 | 0.09 | 0.06 | 0.05 | 0.08 | 0.06 | 0.05 | 0.23 | 0.18 | 0.23 | 0.16 | 0.21 | 0.16 | 0.02 | 0.14 | 0.28 | 0.17 | 0.00 |
K2O | 7.63 | 8.10 | 8.14 | 8.16 | 8.08 | 9.62 | 9.60 | 9.29 | 9.60 | 9.42 | 8.91 | 8.90 | 8.96 | 8.90 | 8.57 | 10.39 | 10.33 | 10.87 | 10.27 | 10.48 | 10.72 | 9.65 | 9.32 | 9.28 | 9.32 | 9.05 |
Formula Units | ||||||||||||||||||||||||||
Si | 2.71 | 2.71 | 2.73 | 2.73 | 2.74 | 2.78 | 2.77 | 2.75 | 2.78 | 2.77 | 2.77 | 2.75 | 2.77 | 2.76 | 2.74 | 2.70 | 2.71 | 2.70 | 2.68 | 2.68 | 2.72 | 2.71 | 2.72 | 2.75 | 2.72 | 2.69 |
Ti | 0.09 | 0.09 | 0.08 | 0.08 | 0.08 | 0.10 | 0.10 | 0.10 | 0.10 | 0.10 | 0.11 | 0.11 | 0.11 | 0.11 | 0.11 | 0.10 | 0.09 | 0.09 | 0.10 | 0.10 | 0.09 | 0.10 | 0.10 | 0.09 | 0.09 | 0.10 |
Al | 1.68 | 1.69 | 1.71 | 1.70 | 1.69 | 1.57 | 1.60 | 1.61 | 1.58 | 1.59 | 1.66 | 1.66 | 1.66 | 1.65 | 1.65 | 1.68 | 1.69 | 1.69 | 1.69 | 1.69 | 1.68 | 1.68 | 1.68 | 1.68 | 1.70 | 1.71 |
Cr | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Fe | 1.53 | 1.37 | 1.35 | 1.34 | 1.34 | 1.28 | 1.24 | 1.28 | 1.24 | 1.28 | 1.46 | 1.47 | 1.45 | 1.47 | 1.51 | 1.42 | 1.41 | 1.40 | 1.45 | 1.42 | 1.39 | 1.54 | 1.53 | 1.48 | 1.49 | 1.55 |
Mn | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Mg | 0.96 | 1.08 | 1.05 | 1.07 | 1.08 | 1.10 | 1.13 | 1.13 | 1.13 | 1.10 | 0.85 | 0.87 | 0.86 | 0.87 | 0.89 | 0.93 | 0.93 | 0.93 | 0.94 | 0.95 | 0.90 | 0.83 | 0.84 | 0.84 | 0.86 | 0.86 |
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 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Na | 0.00 | 0.04 | 0.04 | 0.05 | 0.04 | 0.01 | 0.00 | 0.01 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.03 | 0.03 | 0.03 | 0.02 | 0.03 | 0.02 | 0.00 | 0.02 | 0.04 | 0.02 | 0.00 |
K | 0.75 | 0.79 | 0.78 | 0.79 | 0.78 | 0.93 | 0.92 | 0.90 | 0.93 | 0.91 | 0.87 | 0.87 | 0.88 | 0.87 | 0.84 | 1.02 | 1.01 | 1.06 | 1.00 | 1.02 | 1.04 | 0.96 | 0.93 | 0.91 | 0.92 | 0.91 |
F | 0.61 | 0.56 | 0.56 | 0.56 | 0.56 | 0.54 | 0.52 | 0.53 | 0.52 | 0.54 | 0.63 | 0.63 | 0.63 | 0.63 | 0.63 | 0.60 | 0.60 | 0.60 | 0.61 | 0.60 | 0.61 | 0.65 | 0.65 | 0.64 | 0.64 | 0.64 |
Temperature, °C | ||||||||||||||||||||||||||
H2005 | 549 | 540 | 533 | 524 | 521 | 589 | 580 | 578 | 589 | 581 | 573 | 575 | 574 | 588 | 574 | 559 | 554 | 551 | 558 | 562 | 552 | 554 | 553 | 548 | 542 | 538 |
Wu2015 | 572 | 546 | 550 | 542 | 539 | 570 | 563 | 560 | 567 | 567 | 614 | 608 | 612 | 619 | 601 | 571 | 569 | 568 | 568 | 569 | 575 | 594 | 591 | 590 | 581 | 570 |
Sample | OC-24 | OC-40 | OC-99 | 19-EL-2 | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 1 | 2 | 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | 5 | |
SiO2 | 24.000 | 23.960 | 24.400 | 24.020 | 24.120 | 23.570 | 23.350 | 26.345 | 25.716 | 24.591 | 24.983 | 24.928 | 24.733 | 24.570 | 24.520 | 24.394 | 24.673 | 24.644 |
TiO2 | 0.065 | 0.048 | 0.071 | 0.105 | 0.056 | 0.060 | 0.044 | 0.057 | 0.071 | 0.092 | 0.071 | 0.102 | 0.113 | 0.081 | 0.115 | 0.087 | 0.053 | 0.118 |
Al2O3 | 22.900 | 22.850 | 22.700 | 23.110 | 23.060 | 22.430 | 22.640 | 21.265 | 21.441 | 22.765 | 22.733 | 22.942 | 23.120 | 23.314 | 23.420 | 23.321 | 23.047 | 23.104 |
Cr2O3 | 0.024 | 0.014 | 0.000 | 0.036 | 0.020 | 0.024 | 0.023 | 0.020 | 0.054 | 0.064 | 0.031 | 0.063 | 0.028 | 0.000 | 0.031 | 0.035 | 0.048 | 0.000 |
FeOtotal | 29.800 | 30.160 | 29.670 | 29.160 | 29.820 | 29.620 | 29.500 | 27.481 | 28.511 | 30.393 | 31.199 | 30.415 | 30.575 | 29.476 | 29.599 | 29.925 | 29.515 | 28.661 |
MnO | 0.024 | 0.013 | 0.008 | 0.017 | 0.018 | 0.005 | 0.022 | 0.465 | 0.553 | 0.173 | 0.205 | 0.177 | 0.177 | 0.070 | 0.068 | 0.067 | 0.073 | 0.089 |
MgO | 12.320 | 12.630 | 13.140 | 12.890 | 12.550 | 12.610 | 12.690 | 15.227 | 14.463 | 11.582 | 11.504 | 11.198 | 11.295 | 12.302 | 12.330 | 12.285 | 12.251 | 12.495 |
CaO | 0.011 | 0.000 | 0.001 | 0.000 | 0.022 | 0.012 | 0.000 | 0.028 | 0.009 | 0.019 | 0.000 | 0.031 | 0.008 | 0.015 | 0.016 | 0.010 | 0.043 | 0.030 |
Na2O | 0.032 | 0.000 | 0.000 | 0.078 | 0.029 | 0.000 | 0.063 | 0.049 | 0.000 | 0.034 | 0.000 | 0.000 | 0.029 | 0.025 | 0.000 | 0.193 | 0.204 | 0.000 |
K2O | 0.003 | 0.011 | 0.002 | 0.000 | 0.011 | 0.003 | 0.000 | 0.006 | 0.038 | 0.000 | 0.000 | 0.011 | 0.012 | 0.046 | 0.000 | 0.086 | 0.045 | 0.032 |
Total | 89.177 | 89.685 | 89.991 | 89.416 | 89.706 | 88.334 | 88.332 | 90.943 | 90.856 | 89.713 | 90.726 | 89.867 | 90.090 | 89.899 | 90.099 | 90.403 | 89.952 | 89.173 |
Cations Based on 14 oxygen | ||||||||||||||||||
Si | 2.541 | 2.522 | 2.552 | 2.525 | 2.536 | 2.517 | 2.489 | 2.697 | 2.651 | 2.603 | 2.622 | 2.640 | 2.611 | 2.579 | 2.569 | 2.545 | 2.586 | 2.602 |
Al(IV) | 1.459 | 1.478 | 1.448 | 1.475 | 1.464 | 1.483 | 1.511 | 1.303 | 1.349 | 1.397 | 1.378 | 1.360 | 1.389 | 1.421 | 1.431 | 1.455 | 1.414 | 1.398 |
∑T sites | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 | 4.000 |
Al(VI) | 1.399 | 1.356 | 1.350 | 1.388 | 1.393 | 1.339 | 1.333 | 1.263 | 1.256 | 1.444 | 1.435 | 1.504 | 1.488 | 1.463 | 1.461 | 1.412 | 1.432 | 1.477 |
Fe(3+) | 0.054 | 0.115 | 0.088 | 0.083 | 0.067 | 0.133 | 0.182 | 0.040 | 0.083 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.077 | 0.017 | 0.000 |
Fe(2+) | 2.584 | 2.540 | 2.507 | 2.480 | 2.555 | 2.511 | 2.448 | 2.313 | 2.375 | 2.691 | 2.739 | 2.694 | 2.699 | 2.587 | 2.594 | 2.533 | 2.570 | 2.531 |
Mn | 0.002 | 0.001 | 0.001 | 0.002 | 0.002 | 0.000 | 0.002 | 0.040 | 0.048 | 0.016 | 0.018 | 0.016 | 0.016 | 0.006 | 0.006 | 0.006 | 0.006 | 0.008 |
Mg | 1.945 | 1.982 | 2.049 | 2.020 | 1.967 | 2.007 | 2.017 | 2.324 | 2.222 | 1.828 | 1.800 | 1.768 | 1.778 | 1.925 | 1.926 | 1.910 | 1.914 | 1.967 |
Ti | 0.005 | 0.004 | 0.006 | 0.008 | 0.004 | 0.005 | 0.003 | 0.004 | 0.006 | 0.007 | 0.006 | 0.008 | 0.009 | 0.006 | 0.009 | 0.007 | 0.004 | 0.009 |
Cr | 0.002 | 0.001 | 0.000 | 0.003 | 0.002 | 0.002 | 0.002 | 0.002 | 0.004 | 0.005 | 0.003 | 0.005 | 0.002 | 0.000 | 0.003 | 0.003 | 0.004 | 0.000 |
∑O sites | 5.992 | 5.998 | 6.000 | 5.984 | 5.990 | 5.998 | 5.987 | 5.986 | 5.994 | 5.991 | 6.000 | 5.995 | 5.992 | 5.987 | 5.998 | 5.948 | 5.948 | 5.992 |
Oct vacancy | 0.008 | 0.002 | 0.000 | 0.016 | 0.010 | 0.002 | 0.013 | 0.014 | 0.006 | 0.009 | 0.000 | 0.005 | 0.008 | 0.013 | 0.002 | 0.052 | 0.052 | 0.008 |
R(2+) | 4.531 | 4.523 | 4.557 | 4.502 | 4.523 | 4.519 | 4.466 | 4.678 | 4.645 | 4.534 | 4.557 | 4.478 | 4.493 | 4.518 | 4.525 | 4.449 | 4.490 | 4.506 |
R(3+) | 1.461 | 1.476 | 1.443 | 1.483 | 1.467 | 1.479 | 1.521 | 1.309 | 1.349 | 1.457 | 1.443 | 1.517 | 1.499 | 1.469 | 1.473 | 1.499 | 1.458 | 1.487 |
Ca | 0.001 | 0.000 | 0.000 | 0.000 | 0.002 | 0.001 | 0.000 | 0.003 | 0.001 | 0.002 | 0.000 | 0.004 | 0.001 | 0.002 | 0.002 | 0.001 | 0.005 | 0.003 |
Na | 0.007 | 0.000 | 0.000 | 0.016 | 0.006 | 0.000 | 0.013 | 0.010 | 0.000 | 0.007 | 0.000 | 0.000 | 0.006 | 0.005 | 0.000 | 0.039 | 0.041 | 0.000 |
K | 0.000 | 0.002 | 0.000 | 0.000 | 0.001 | 0.000 | 0.000 | 0.001 | 0.005 | 0.000 | 0.000 | 0.001 | 0.002 | 0.006 | 0.000 | 0.011 | 0.006 | 0.004 |
Fe/(Fe*Mg) | 0.576 | 0.573 | 0.559 | 0.559 | 0.571 | 0.569 | 0.566 | 0.503 | 0.525 | 0.595 | 0.603 | 0.604 | 0.603 | 0.573 | 0.574 | 0.577 | 0.575 | 0.563 |
Chlorite Crystallisation Temperature | ||||||||||||||||||
ME (°C) | 406 | 411 | 402 | 411 | 408 | 412 | 419 | 356 | 370 | 390 | 384 | 381 | 389 | 397 | 400 | 404 | 393 | 391 |
CN (°C) | 326 | 329 | 323 | 329 | 327 | 330 | 335 | 293 | 302 | 315 | 311 | 310 | 315 | 320 | 322 | 325 | 317 | 316 |
KM (°C) | 369 | 372 | 365 | 371 | 369 | 372 | 377 | 331 | 341 | 359 | 356 | 354 | 359 | 363 | 365 | 368 | 360 | 358 |
J (°C) | 413 | 418 | 408 | 417 | 414 | 419 | 426 | 361 | 376 | 397 | 392 | 389 | 397 | 404 | 407 | 411 | 400 | 398 |
Sample | T, °C | P, kbar | |
---|---|---|---|
Ti-in-Bt | Grt-Bt | Grt-Bt-Pl-Qtz | |
OC107 | 577 | 540 | 6.3 |
OC05 | 560 | 580 | 6.5 |
OC06 | 570 | 545 | 6.7 |
OC95 | 590 | 555 | 7.4 |
OC99 | 595 | 550 | 6.9 |
OC100 | 565 | 565 | 6.6 |
OC102 | 585 | 575 | 6.8 |
OC119 | 560 | 570 | 7.2 |
OC120 | 580 | 550 | 6.5 |
OC49 | 590 | 565 | 7.4 |
Sample | n | D1 | G | D2 | R1 | R2 | Temperature (°C) | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Position | FWHM | Position | FWHM | Position | FWHM | Beyssac et al. [2] | Rahl et al. [43] | ||||||||||||||||
Mean | SE | Mean | SE | Mean | Se | Mean | Se | Mean | Se | Mean | Se | Mean | Se | Mean | Se | Mean | Min | Max | Mean | Min | Max | ||
oc-24 | 78 | 1350.0 | 3.7 | 46.4 | 1.4 | 1576.0 | 2.3 | 20.0 | 1.3 | 1616.5 | 2.7 | 14.8 | 3.7 | 0.3 | 0.1 | 0.3 | 0.1 | 508 | 413 | 579 | 495 | 374 | 617 |
oc-40 | 44 | 1353.4 | 2.4 | 45.1 | 1.4 | 1576.5 | 1.4 | 21.1 | 2.5 | 1617.2 | 1.9 | 11.8 | 2.6 | 0.3 | 0.1 | 0.3 | 0.0 | 511 | 470 | 562 | 504 | 437 | 588 |
oc-99 | 79 | 1353.8 | 2.7 | 44.1 | 1.5 | 1577.7 | 1.4 | 19.7 | 1.8 | 1618.9 | 1.9 | 11.0 | 2.2 | 0.2 | 0.1 | 0.2 | 0.1 | 539 | 461 | 612 | 548 | 428 | 681 |
19-El-2 | 67 | 1355.2 | 3.1 | 44.2 | 2.7 | 1577.0 | 2.0 | 17.6 | 1.0 | 1600.0 | 34.2 | 12.6 | 3.7 | 0.2 | 0.1 | 0.2 | 0.1 | 546 | 451 | 607 | 558 | 400 | 670 |
19-El-5 | 63 | 1352.2 | 4.3 | 44.2 | 2.8 | 1574.8 | 3.4 | 18.5 | 1.8 | 1615.0 | 4.1 | 14.2 | 3.3 | 0.1 | 0.1 | 0.2 | 0.1 | 561 | 496 | 611 | 586 | 477 | 678 |
Heating Step | T (°C) | 40Ar/39Ar | ±1σ | 38Ar/39Ar | ±1σ | 37Ar/39Ar | ±1σ | 36Ar/39Ar | ±1σ | Ca/K | ∑39Ar (%) | Age, Ma | ±1σ |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sample Eld-642 (sericite), Weight = 8.8 mg, J = 0.003175 ± 0.000026 | |||||||||||||
1 | 500 | 71.3 | 0.141 | 0.086 | 0.00216 | 1103.652 | 70.38 | 0.0974 | 0.00395 | 3973.1 | 2.4 | 228.7 | 6.2 |
2 | 600 | 116.7 | 0.18 | 0.06 | 0.00135 | 716.613 | 39.93 | 0.0531 | 0.00164 | 2579.8 | 6.4 | 502 | 4.2 |
3 | 700 | 150.7 | 0.255 | 0.049 | 0.00082 | 521.11 | 16.63 | 0.0592 | 0.00142 | 1876 | 13.5 | 636.4 | 4.8 |
4 | 750 | 177.5 | 0.129 | 0.023 | 0.00068 | 158.15 | 16.39 | 0.0074 | 0.00109 | 569.34 | 27.8 | 798.3 | 5.4 |
5 | 800 | 180.6 | 0.103 | 0.023 | 0.00054 | 65.813 | 12.22 | 0.0121 | 0.00077 | 236.93 | 45.8 | 804.4 | 5.4 |
6 | 900 | 180.3 | 0.124 | 0.028 | 0.00049 | 220.31 | 17.23 | 0.0193 | 0.00059 | 793.12 | 60.7 | 795.8 | 5.3 |
7 | 1000 | 180.7 | 0.171 | 0.028 | 0.00067 | 134.609 | 24.06 | 0.0207 | 0.00153 | 484.6 | 71.9 | 795.6 | 5.6 |
8 | 1130 | 191.1 | 0.087 | 0.024 | 0.00035 | 71.454 | 8.19 | 0.0248 | 0.00054 | 257.2 | 100 | 829.3 | 5.5 |
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Sukhorukov, V.; Volkova, V.; Nevolko, P.; Kozlov, P. Metamorphic Conditions and Raman Spectroscopic Carbonaceous Material Thermometry of Host Schists of Olympiada and Eldorado Gold Deposits (Yenisey Ridge, Russia). Geosciences 2021, 11, 452. https://doi.org/10.3390/geosciences11110452
Sukhorukov V, Volkova V, Nevolko P, Kozlov P. Metamorphic Conditions and Raman Spectroscopic Carbonaceous Material Thermometry of Host Schists of Olympiada and Eldorado Gold Deposits (Yenisey Ridge, Russia). Geosciences. 2021; 11(11):452. https://doi.org/10.3390/geosciences11110452
Chicago/Turabian StyleSukhorukov, Vasiliy, Valeriya Volkova, Peter Nevolko, and Pavel Kozlov. 2021. "Metamorphic Conditions and Raman Spectroscopic Carbonaceous Material Thermometry of Host Schists of Olympiada and Eldorado Gold Deposits (Yenisey Ridge, Russia)" Geosciences 11, no. 11: 452. https://doi.org/10.3390/geosciences11110452