Geochemistry and Genesis of Beryl Crystals in the LCT Pegmatite Type, Ebrahim-Attar Mountain, Western Iran
Abstract
:1. Introduction
2. Geological Setting and Mineralogy
3. Analytical Method
4. Results
4.1. Beryl Chemistry
4.2. Crytallochemistry of Beryl
4.3. 87Sr/86Sr Isotope Ratios in the Beryl Grains
5. Discussion
5.1. Beryl and Its Parental Magma
5.2. Geochemical Characteristics of Beryl Grains
5.3. Beryl Mineralization
6. Conclusions
- According to the mineral sequence, beryl is the only Be-bearing mineral, and its host rock is classified as Be-pegmatite in the Ebrahim-Attar area.
- The host rock has an LCT pegmatite and is a less-evolved pegmatite with high values of Nb/Ta (4.79–16.3) and Zr/Hf (12.2–19.1).
- Pale-green to white-colored beryl in the host granite appears as euhedral crystals and is alkali-poor beryl with low amounts of Na2O, K2O, Li2O, and Cs2O.
- Concentrations of Cs and Na/Li values in the beryl grains imply a magmatic signature and suggest a relation to less-evolved granite.
- High 87Sr/86Sr ratios of both the beryl and its host granite are consistent with continental crust contributions from their sources.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample Name | BYL1 | BYL2 | BYL3 | BYL4 | BYL5 | BYL6 | BYL7 | Blank |
---|---|---|---|---|---|---|---|---|
SiO2 | 66.6 | 66.8 | 66.2 | 67.2 | 65.9 | 66.2 | 67.0 | |
Al2O3 | 18.9 | 19.0 | 18.7 | 19.1 | 19.3 | 19.2 | 19.0 | |
Fe2O3 | 0.31 | 0.49 | 0.40 | 0.50 | 1.31 | 0.42 | 0.35 | |
MnO | 0.005 | 0.006 | 0.006 | 0.004 | 0.008 | 0.005 | 0.005 | |
MgO | 0.022 | 0.007 | 0.020 | 0.019 | 0.017 | 0.019 | 0.023 | |
CaO | 0.071 | 0.069 | 0.068 | 0.070 | 0.072 | 0.087 | 0.079 | |
Na2O | 0.36 | 0.24 | 0.28 | 0.25 | 0.29 | 0.41 | 0.26 | |
K2O | 0.072 | 0.053 | 0.186 | 0.088 | 0.132 | 0.217 | 0.052 | |
P2O5 | 0.009 | 0.007 | 0.007 | 0.006 | 0.008 | 0.013 | 0.007 | |
BeO | 11.9 | 11.3 | 10.6 | 10.0 | 10.7 | 10.3 | 10.2 | <10 ng |
LOI | 1.61 | 1.63 | 1.63 | 1.65 | 1.69 | 1.70 | 1.68 | |
Total | 99.9 | 99.7 | 98.1 | 98.9 | 99.4 | 98.5 | 98.6 | |
Li | 155 | 143 | 145 | 164 | 173 | 178 | 179 | 40 ng |
V | 1.29 | 0.58 | 0.74 | 0.63 | 0.85 | 0.93 | 0.89 | 3 ng |
Zn | 55.8 | 40.8 | 33.0 | 52.9 | 31.9 | 62.4 | 51.9 | 70 ng |
Rb | 66 | 53 | 55 | 15 | 85 | 72 | 44 | 10 µg |
Sr | 3.61 | 3.01 | 2.26 | 2.73 | 3.26 | 3.12 | 3.73 | 1 ng |
Nb | 0.90 | 11.8 | 6.92 | 0.98 | 2.90 | 2.43 | 0.52 | 2 ng |
Cs | 199 | 253 | 228 | 106 | 260 | 121 | 167 | 5 ng |
Y | 0.833 | 0.565 | 0.547 | 0.588 | 0.351 | 0.489 | 0.511 | 90 pg |
La | 0.869 | 0.274 | 0.098 | 0.039 | 0.174 | 0.566 | 0.145 | 60 pg |
Ce | 2.05 | 0.778 | 0.269 | 0.136 | 0.532 | 1.219 | 0.444 | 140 pg |
Pr | 0.224 | 0.087 | 0.035 | 0.014 | 0.047 | 0.131 | 0.038 | 30 pg |
Nd | 0.661 | 0.280 | 0.132 | 0.057 | 0.153 | 0.387 | 0.134 | 50 pg |
Sm | 0.307 | 0.184 | 0.131 | 0.067 | 0.095 | 0.176 | 0.087 | 11 pg |
Eu | 0.0026 | 0.0018 | 0.0009 | 0.0007 | 0.0007 | 0.0017 | 0.0022 | <5 pg |
Gd | 0.220 | 0.164 | 0.154 | 0.113 | 0.094 | 0.141 | 0.105 | 6 pg |
Tb | 0.045 | 0.037 | 0.037 | 0.031 | 0.021 | 0.029 | 0.027 | 2 pg |
Dy | 0.144 | 0.120 | 0.129 | 0.113 | 0.076 | 0.097 | 0.104 | 6 pg |
Ho | 0.0122 | 0.0112 | 0.0114 | 0.0110 | 0.0064 | 0.0082 | 0.0097 | 5 pg |
Er | 0.020 | 0.020 | 0.019 | 0.018 | 0.012 | 0.017 | 0.015 | 14 pg |
Tm | 0.0023 | 0.0027 | 0.0027 | 0.0027 | 0.0014 | 0.0023 | 0.0028 | 5 pg |
Yb | 0.018 | 0.021 | 0.016 | 0.018 | 0.013 | 0.014 | 0.017 | 15 pg |
Lu | 0.0023 | 0.0027 | 0.0021 | 0.0019 | 0.0017 | 0.0022 | 0.0028 | 3 pg |
ΣREE | 5.41 | 2.55 | 1.58 | 1.21 | 1.58 | 3.28 | 1.64 | |
ΣLREE | 4.33 | 1.77 | 0.82 | 0.43 | 1.10 | 2.62 | 0.96 | |
ΣHREE | 0.244 | 0.213 | 0.217 | 0.195 | 0.131 | 0.170 | 0.178 | |
ΣHREE/ΣLREE | 0.056 | 0.121 | 0.264 | 0.458 | 0.119 | 0.065 | 0.187 | |
(Ce/La)N | 0.913 | 1.10 | 1.06 | 1.34 | 1.19 | 0.835 | 1.18 | |
(La/Yb)N | 34.8 | 9.59 | 4.33 | 1.57 | 9.96 | 28.0 | 6.14 | |
(La/Sm)N | 1.83 | 0.963 | 0.484 | 0.381 | 1.18 | 2.078 | 1.08 | |
Eu/Eu* | 0.030 | 0.031 | 0.019 | 0.025 | 0.021 | 0.032 | 0.072 |
Sample Name | BYL1 | BYL2 | BYL3 | BYL4 | BYL5 | BYL6 | BYL7 | Average |
---|---|---|---|---|---|---|---|---|
Si | 6.292 | 6.337 | 6.396 | 6.449 | 6.307 | 6.387 | 6.435 | 6.372 |
Al | 2.103 | 2.122 | 2.128 | 2.157 | 2.174 | 2.179 | 2.154 | 2.145 |
Fe | 0.023 | 0.035 | 0.029 | 0.037 | 0.096 | 0.031 | 0.026 | 0.040 |
Mn | 0.0004 | 0.0005 | 0.0005 | 0.0003 | 0.0007 | 0.0004 | 0.0004 | 0.000 |
Mg | 0.003 | 0.001 | 0.003 | 0.003 | 0.002 | 0.003 | 0.003 | 0.003 |
Ca | 0.0071 | 0.0069 | 0.0070 | 0.0071 | 0.0073 | 0.0089 | 0.0080 | 0.007 |
Na | 0.064 | 0.043 | 0.051 | 0.044 | 0.053 | 0.075 | 0.046 | 0.054 |
K | 0.0084 | 0.0062 | 0.0222 | 0.0104 | 0.0156 | 0.0259 | 0.0062 | 0.014 |
Be | 2.651 | 2.531 | 2.403 | 2.253 | 2.411 | 2.328 | 2.303 | 2.411 |
Li | 0.011 | 0.011 | 0.011 | 0.015 | 0.015 | 0.015 | 0.015 | 0.013 |
Cs | 0.0008 | 0.0012 | 0.0008 | 0.0004 | 0.0012 | 0.0004 | 0.0008 | 0.001 |
Na/Li | 5.75 | 3.84 | 4.51 | 2.94 | 3.49 | 4.93 | 3.04 | 4.07 |
Sample Name | BRYL1 | BRYL2 | BRYL3 | BRYL4 | BRYL5 | BRYL6 | BRYL7 |
---|---|---|---|---|---|---|---|
87Sr/86Sr | 0.749177 | 0.768480 | 0.806010 | 0.752527 | 0.762224 | 0.773416 | 0.738121 |
Error (1SE) | 0.000007 | 0.000016 | 0.000006 | 0.000008 | 0.000007 | 0.000006 | 0.000007 |
Rb (ppm) | 66 | 53 | 55 | 15 | 85 | 72 | 44 |
Sr (ppm) | 3.61 | 3.01 | 2.26 | 2.73 | 3.26 | 3.12 | 3.73 |
87Rb/86Sr | 53 | 52 | 71 | 16 | 76 | 67 | 34 |
Name | Ebrahim-Attar Granitic Pegmatite | Zealand Station Dyke |
---|---|---|
Rb | 145–440 | 218–327 |
Cs | 0.6–4.7 | 6–22 |
Nb | 9.3–71.4 | 12.0–21.3 |
Ta | 0.57–9.14 | 3–14 |
Rb/Sr | 4.5–60 | 4.1–15.8 |
Nb/Ta | 4.8–16.3 | 2.6–7.1 |
Zr/Hf | 12.2–19.1 | 12.6–76.9 |
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Daneshvar, N.; Azizi, H.; Asahara, Y.; Tsuboi, M.; Minami, M.; Mohammad, Y.O. Geochemistry and Genesis of Beryl Crystals in the LCT Pegmatite Type, Ebrahim-Attar Mountain, Western Iran. Minerals 2021, 11, 717. https://doi.org/10.3390/min11070717
Daneshvar N, Azizi H, Asahara Y, Tsuboi M, Minami M, Mohammad YO. Geochemistry and Genesis of Beryl Crystals in the LCT Pegmatite Type, Ebrahim-Attar Mountain, Western Iran. Minerals. 2021; 11(7):717. https://doi.org/10.3390/min11070717
Chicago/Turabian StyleDaneshvar, Narges, Hossein Azizi, Yoshihiro Asahara, Motohiro Tsuboi, Masayo Minami, and Yousif O. Mohammad. 2021. "Geochemistry and Genesis of Beryl Crystals in the LCT Pegmatite Type, Ebrahim-Attar Mountain, Western Iran" Minerals 11, no. 7: 717. https://doi.org/10.3390/min11070717