Indexing
All Issues
Submission
Author Guidelines
Reviewers
Editorial Members
Publication Fee
Vol.3 , No. 5, Publication Date: Sep. 13, 2016, Page: 49-56
 aqueous and immiscible three-phase (H<sub>2</sub>O-CO<sub>2</sub>) inclusions which probably trapped from one homogeneous fluid (H<sub>2</sub>O˗CO<sub>2</sub>˗NaCl) due to immiscibility process. Two-phase aqueous inclusions (type 1) are represented by three generations (subtype 1a, subtype 1b and subtype 1c). Immiscible three-phase inclusions are conformable and coexisting with the three generations of aqueous inclusions. Based on paragenetic distribution of the inclusions, subtype 1a and subtype 2a are primary, subtype 1b and 2b are pseudosecondary, while subtype 1c and 2c are secondary distributed. Microthermometric results for the first generation (subtypes 1a and 2a) inclusions revealed that the greisenization probably starts at temperature > 330°C. Greisenization as well as cassiterite deposits probably continuous with decreasing temperature (330°C - 270°C) and pressure estimated between 1.4 kb and 0.65 kb. Subtypes 1b and 2b as well as fluorite deposits may be taken place due to dilution at temperature and pressure (260°C - 180°C and 536 - 441 bars). The latest fluid generation is represented by high saline poly-phase, two-phase (subtype 1c) and mono-phase aqueous inclusions. Such coexistence of inclusions is an evidence of boiling. In fluorite veins only primary two-phase aqueous inclusions were observed. The minimum pressures of trapping are between 181 and 212 bars at temperatures between 140°C and 200°C.&picture=http://www.aascit.org/aascit/decorators/img/journal/899.jpg)
| [1] | Hany H. El Hadek, Geology Department, Faculty of Science, Assiut University, Assiut, Egypt. |
| [2] | Mohamed Abdel-Moneim Mohamed, Geology Department, Faculty of Science, Assiut University, Assiut, Egypt. |
| [3] | Wagih W. Bishara, Geology Department, Faculty of Science, Assiut University, Assiut, Egypt. |
| [4] | Galal H. El Habaak, Geology Department, Faculty of Science, Assiut University, Assiut, Egypt. |
| [5] | Kamal A. Ali, Department of Mineral Resources and Rocks, Faculty of Earth Sciences, King Abdulaziz University, Jeddah, Saudi Arabia. |
The late-Proterozoic Homrit Waggat granite complex contains Sn-F bearing quartz-muscovite greisen zone as well as fluorite veins. Fluid inclusions study in quartz and fluorite from greisen indicates the same fluid inclusion types. Fluid inclusions trapped in greisenized granite are represented mainly by two–phase (L+V) aqueous and immiscible three-phase (H2O-CO2) inclusions which probably trapped from one homogeneous fluid (H2O˗CO2˗NaCl) due to immiscibility process. Two-phase aqueous inclusions (type 1) are represented by three generations (subtype 1a, subtype 1b and subtype 1c). Immiscible three-phase inclusions are conformable and coexisting with the three generations of aqueous inclusions. Based on paragenetic distribution of the inclusions, subtype 1a and subtype 2a are primary, subtype 1b and 2b are pseudosecondary, while subtype 1c and 2c are secondary distributed. Microthermometric results for the first generation (subtypes 1a and 2a) inclusions revealed that the greisenization probably starts at temperature > 330°C. Greisenization as well as cassiterite deposits probably continuous with decreasing temperature (330°C - 270°C) and pressure estimated between 1.4 kb and 0.65 kb. Subtypes 1b and 2b as well as fluorite deposits may be taken place due to dilution at temperature and pressure (260°C - 180°C and 536 - 441 bars). The latest fluid generation is represented by high saline poly-phase, two-phase (subtype 1c) and mono-phase aqueous inclusions. Such coexistence of inclusions is an evidence of boiling. In fluorite veins only primary two-phase aqueous inclusions were observed. The minimum pressures of trapping are between 181 and 212 bars at temperatures between 140°C and 200°C.
Keywords
Fluid Inclusions, Microthermometry, Sn-F Bearing Greisen, Fluorite Veins, Isochores
Reference
| [01] | Roedder, E. 1984. Fluid inclusions. Reviews in Mineralogy (ed. P. H. Ribbe). Mineral. Soc. Amer. 12, p 644. |
| [02] | Lu, H. Z., Fan, H. R., Ni, P., Ou, X. G., Shen, K., Zhang, W. H., 2004. Fluid Inclusions. Geological Publishing House, Beijing. |
| [03] | Pirajno, F., 2009. Hydrothermal processes and mineral systems. Geol. Surv. Western Australia. Springer. |
| [04] | Nash, J. T., 1976. Fluid-inclusion petrology-data from porphyry copper deposits and applications to exploration. U.S. Geol. Surv. Professional Paper, 907-D. |
| [05] | Haapala, I., 1997. Magmatic and post-magmatic processes in tin-mineralized granites: Topaz-bearing leucogranite in the Eurajoki rapakivi granite stock, Finland. J. Petrol. 38 (12), 1645-1659. |
| [06] | Zdeněk, D.; Miloš, R.; Walter, P., 2011. Fluid inclusions of the Horní Slavkov Sn-W ore deposit, Bohemian Massif, Czech Republic: evidence for non-magmatic source of greisenizing fluids. European Current Research on Fluid Inclusions (ECROFI-XXI) Montanuniversität Leoben, Austria. Abstracts, 68-69. |
| [07] | Mohamed, M. A., 2013. Evolution of mineralizing fluids of cassiterite–wolframite and fluorite deposits from Mueilha tin mine area, Eastern Desert of Egypt, evidence from fluid inclusion. Arab. J. Geosci. 6: 775-782. |
| [08] | Sadequi, M.; Bouabdellah, M.; Boushaba, A.; Marcoux, E.; Cheilletz, A., 2013. Mineralogy, fluid inclusion, and oxygen isotope constraints on the genesis of the Lalla Zahra W-(Cu) deposit, Alouana district, northeastern Morocco. Arab. J. Geosci. 6, 3067-3085. |
| [09] | Chicharro, E.; Boiron, M-C; López-García, J. Á.; Barfod, D. N.; Villaseca, C., 2016. Origin, ore forming fluid evolution and timing of the Logrosán Sn–(W) ore deposits (Central Iberian Zone, Spain). Ore Geol. Rev. 72, 896–913. |
| [10] | El Hadek, H. H. 2016. Rare-metal granites and their related mineralization, Central Eastern Desert, Egypt. PhD thesis, Geology Department, Faculty of Science, Assiut University. (in press.). |
| [11] | Hassanen, M. A., 1997. Post-collision, A-type granites of Homrit Waggat complex, Egypt: petrological and geochemical constraints on its origin. Precam. Res. 82, 211-236. |
| [12] | Zhang, Y. G., Frantz, J. D., 1987. Determination of the homogenization temperature and densities of supercritical fluids in the system NaCl-KCl-CaCl2-H2O using synthetic fluid inclusions. Chem. Geol. 64, 335-350. |
| [13] | Brown, P. E., Lamb, W. M., 1989. P–V–T Properties of Fluids in the System H2O–CO2–NaCl: new graphical presentations and implications for fluid inclusion studies. Geochim. Cosmochim. Acta 53, 1209–1221. |
| [14] | Brown, P. E., 1989. Flincor, A microcomputer program for the reduction and investigation of fluid inclusion data. Amer. Mineral. 74, 1390-1393. |
| [15] | Brown, P. E., 1998. Fluid inclusion modeling for hydrothermal system. Rev. Econ. Geol. 10, 151–171. |
| [16] | Diamond, L. W., 1992. Stability of CO2 clathrate hydrate + CO2 liquid + CO2 vapour + aqueous KCl-NaCl solutions: experimental determination and application to salinity estimates of fluid inclusions. Geochim. Cosmochim. Acta 56, 273–280. |
| [17] | Fall, A., Tattitch, B., Bodnar, R. J., 2011. Combined microthermometric and ramman spectroscopic technique to determine the salinity of H2O-CO2-NaCl fluid inclusions based on clathrate melting. Geochim. Cosmochim. Acta 75 (4), 951–964. |
| [18] | Ramboz, C., Pichavant, M. A., Weisbrod, A., 1982. Fluid immiscibility in natural processes: Use and misuse of fluid inclusion data: II. Interpretation of fluid inclusion data in terms of immiscibility. Chem. Geol. 37, 29–48. |
| [19] | Sharma, S. C.; Srivastava, P. K., 2012. Preliminary study of melt Inclusions and fluid inclusions in Sn-W-Cu bearing Tosham mineralized igneous body, Bhiwani District, Haryana. J. Biosph. 1, 25-29. |
| [20] | Ramboz, C., Schnapper, D., Dubessy, J. 1985. The P-V-T-X-fO2 evolution of H2O-CO2-CH4 bearing fluid in a wolframite vein: reconstruction from fluid inclusion studies. Geochim. Cosmochim. Acta 49, 205-219. |
| [21] | Shepherd, T. J., Rankin, A. H., Alderton, D. H. M., 1985. A practical guide to fluid inclusion studies. Blackie, London, p 239. |
| [22] | Mangas, J., Arribas, A., 1987. Fluid inclusion study in different types of tin deposits associated with the Hercynian granites of Western Spain. Chem. Geol. 61, 193–208. |
| [23] | Marignac, C., Zouhair, M., 1992. Fluid evolution in an unmineralized greisens-tourmaline system in the Ment granite (central Morocco): a fluid inclusion study. Europ. J. Mineral. 4, 949–964. |
| [24] | Jackson, K. J., Helgeson, H. C., 1985a. Chemical and thermodynamic constraints on the hydrothermal transport and deposition of tin: I. Calculation of solubility of cassiterite at high pressure and temperature. Geochim. Cosmochim. Acta 49, 1–22. |
| [25] | Jackson, N. J., Helgeson, H. C., 1985b. Chemical and thermodynamic constraints on the hydrothermal transport and deposition of tin: II. Interpretation of phase relations in the Southeast Asian tin belt. Econ. Geol. 80, 1365–1378. |
| [26] | Keppler, H., Wyllie, P. J., 1991. Partitioning of Cu, Sn, Mo, W, U and Th between melt and aqueous fluid in the systems haplogranite–H2O–HF. Contrib. Mineral. Petrol. 109, 139–150. |
| [27] | Hu, X.; Bi, X.; Hu, R.; Cai, G.; Chen, Y., 2016. Tin partition behavior and implications for the Furong tin ore formation associated with peralkaline intrusive granite in Hunan Province, China. Acta Geochim. 35 (2), 138–147. |
| [28] | Webster, J., Thomas, R., Förster, H. J., Seltmann, R., Tappen, C., 2004. Geochemical evolution of halogen- enriched, granite magmas and mineralizing fluids of the Zinnwald tin-tungsten mining district, Erzgebirge, Germany. Mineral. Deposita 39, 452–472. |
| [29] | Thomas, R., Förster, H-J., Rickers, K., Webster, J. D., 2005. Formation of extremely F-rich hydrous melt fractions and hydrothermal fluids during differentiation of highly evolved tin–granite magmas: a melt/fluid- inclusion study. Contrib. Mineral. Petrol. 148, 582–601. |
