Electron Probe Micro-Analyzer Studies and Raman Spectroscopic Characterization of Plagioclase in Basaltic Rocks from the Asal–Ghoubbet Area, Republic of Djibouti
Abstract
:1. Introduction
2. Geological Background
3. Sampling and Analytical Methods
4. Results
4.1. Petrography and Mineral Chemistry
4.2. Raman Characteristics of Plagioclases
4.3. Major Element Composition of Plagioclases
5. Discussion
5.1. The Nature of Plagioclases
5.2. H2O Content
5.3. Phase Equilibria
5.4. Plagioclase–Liquid Thermobarometry Calculations
5.5. Magma Reservoir Modeling
6. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Volcano Name | Mineral | H2O (wt.%) Max | H2O (wt.%) Min | H2O (wt.%) Average |
---|---|---|---|---|
Marginal basalts | Macrocryst | 4.19 | 0.77 | 2.34 |
Microcryst | 1.60 | 0.23 | 1.08 | |
Galaé’le Koma volcanoes | Macrocryst | 3.90 | 2.58 | 3.38 |
Microcryst | 3.05 | 0.24 | 1.07 | |
Fialé volcano | Macrocryst | 4.42 | 2.37 | 3.46 |
Microcryst | 3.56 | 1.11 | 2.41 | |
Manda volcano | Macrocryst | 3.83 | 1.74 | 2.71 |
Microcryst | 3.22 | 2.00 | 2.80 | |
Inki Garayto volcanoes | Macrocryst | 4.15 | 2.39 | 3.20 |
Microcryst | 3.02 | 2.64 | 2.81 | |
Ardoukoba volcano | Macrocryst | 4.16 | 1.99 | 3.35 |
Microcryst | 2.65 | 0.58 | 1.71 |
Volcano Name | Mineral | T (°C) Max | T (°C) Min | T (°C) Average | Pressure (P, kbar) Max | Pressure (P, kbar) Min | Pressure (P, kbar) Average |
---|---|---|---|---|---|---|---|
Marginal basalts | Macrocryst | 1216 | 1096 | 1168 | 14.51 | 9.05 | 11.37 |
Microcryst | 1203 | 1125 | 1177 | 14.84 | 9.10 | 12.58 | |
Galaé’le Koma volcanoes | Macrocryst | 1174 | 1082 | 1131 | 9.95 | 6.49 | 8.10 |
Microcryst | 1186 | 1072 | 1156 | 12.46 | 2.99 | 5.51 | |
Fialé volcano | Macrocryst | 1161 | 1085 | 1124 | 12.58 | 3.92 | 8.24 |
Microcryst | 1159 | 1094 | 1126 | 10.09 | 4.00 | 6.26 | |
Manda volcano | Macrocryst | 1176 | 1107 | 1144 | 10.32 | 7.11 | 8.49 |
Microcryst | 1186 | 1098 | 1171 | 12.87 | 9.47 | 11.67 | |
Inki Garayto volcanoes | Macrocryst | 1172 | 1094 | 1133 | 13.67 | 6.72 | 9.11 |
Microcryst | 1186 | 1079 | 1146 | 12.70 | 8.23 | 11.18 | |
Ardoukoba volcano | Macrocryst | 1169 | 1085 | 1130 | 9.75 | 5.87 | 7.75 |
Microcryst | 1168 | 1100 | 1142 | 13.31 | 5.09 | 8.94 |
Volcano Name | Mineral | Pressure (P, kbar) Max | Pressure (P, kbar) Min | Depth (km) |
---|---|---|---|---|
Marginal basalts | Macrocryst | 14.51 | 9.05 | 47.88–29.87 |
Microcryst | 14.84 | 9.10 | 48.97–30.03 | |
Galaé’le Koma volcanoes | Macrocryst | 9.95 | 6.49 | 32.84–21.42 |
Microcryst | 12.46 | 2.99 | 41.12–9.87 | |
Fialé volcano | Macrocryst | 12.58 | 3.92 | 41.51–12.94 |
Microcryst | 10.09 | 4.00 | 33.30–13.20 | |
Manda volcano | Macrocryst | 10.32 | 7.11 | 34.06–23.46 |
Microcryst | 12.87 | 9.47 | 42.47–31.25 | |
Inki Garayto volcanoes | Macrocryst | 13.67 | 6.72 | 45.11–22.18 |
Microcryst | 12.70 | 8.23 | 41.91–27.16 | |
Ardoukoba volcano | Macrocryst | 9.75 | 5.87 | 32.18–19.37 |
Microcryst | 13.31 | 5.09 | 43.92–16.80 |
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Iltireh, A.D.; Kadioğlu, Y.K. Electron Probe Micro-Analyzer Studies and Raman Spectroscopic Characterization of Plagioclase in Basaltic Rocks from the Asal–Ghoubbet Area, Republic of Djibouti. Minerals 2024, 14, 216. https://doi.org/10.3390/min14030216
Iltireh AD, Kadioğlu YK. Electron Probe Micro-Analyzer Studies and Raman Spectroscopic Characterization of Plagioclase in Basaltic Rocks from the Asal–Ghoubbet Area, Republic of Djibouti. Minerals. 2024; 14(3):216. https://doi.org/10.3390/min14030216
Chicago/Turabian StyleIltireh, Awaleh Djama, and Yusuf Kağan Kadioğlu. 2024. "Electron Probe Micro-Analyzer Studies and Raman Spectroscopic Characterization of Plagioclase in Basaltic Rocks from the Asal–Ghoubbet Area, Republic of Djibouti" Minerals 14, no. 3: 216. https://doi.org/10.3390/min14030216