Advertisement

Chinese Journal of Geochemistry

, Volume 21, Issue 2, pp 131–139 | Cite as

Fluid inclusions in the gold-bearing quartz veins at Um Rus area, Eastern Desert, Egypt

  • Mohamed El Tokhi
  • Abdalla El Muslem
Article

Abstract

Fluid inclusions in the gold-bearing quartz veins at the Um Rus area are of three types: H2O, H2O−CO2 and CO2 inclusions. H2O inclusions are the most abundant, they include two phases which exhibit low and high homogenization temperatures ranging from 150 to 200°C and 175 to 250°C, respectively. The salinity of aqueous inclusions, based on ice melting, varies between 6.1 and 8 equiv. wt% NaCl. On the other hand, H2O−CO2 fluid inclusions include three phases. Their total homogenization temperatures range from 270 to 325°C, and their salinity, based on clathrate melting, ranges between 0.8 and 3.8 equiv. wt% NaCl. CO2 fluid inclusions homogenize to a liquid phase and exhibit a low density range from 0.52 to 0.66 g/cm3. The partial mixing of H2O−CO2 and salt H2O−NaCl fluid inclusions is the main source of fluids from which the other types of inclusions were derived. The gold-bearing quartz veins are believed to be of medium temperature hydrothermal convective origin.

Key words

fluid inclusion gold-bearing quartz vein Eastern Desert of Egypt 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Anderson, M.R., A.H. Rankin, and B. Spiro, 1992, Fluid mixing in the generation of mesothermal gold mineralisation in the Transvaal sequence, Transvaal, South Africa [J]: Eur. J. Mineral, v. 4, p. 933–948.Google Scholar
  2. Angues, S., B. Armstrong, K. Dereuck, V. Altumin, O. Gadesku, G. Chapela, and J. Rowlinson, 1976, International thermodynamic tables of the fluid state, carbon dioxide [M]: London, Oxford Pergman Press, v. 3, 385 p.Google Scholar
  3. Bakker, R.J. and J.B. Jansen, 1990, Preferential water leakage from fluid inclusions by means of mobile dislocations [J]: Nature, v. 345.Google Scholar
  4. Cathelineau, M. and M.C. Boiron, 1988, Fluid-mineral equilibria in French hydrothermal gold veins, in A.D.T. Goode et al., eds., Bicentennial Gold 88, ext. abstracts poster program [Z]: Geol. Soc. of Australia, v. 2, p. 428–430.Google Scholar
  5. Collins, P.L., 1979, Gas hydrates in CO2-bearing fluid inclusions and the use of freezing data for estimation of salinity [J]: Econ. Geol., v. 74, p. 1435–1444.Google Scholar
  6. Crawford, M.L., D.W. Kraus, and L.S. Hollister, 1979, Petrologic and fluid inclusion study of czic-silicate rocks, Prince Rupert, British Columbia [J]: Am. J. Sci., v. 279, p. 1135–1159.Google Scholar
  7. El Mahallawi, M.M., 1984, Petrology and geochemistry of the intrusive rocks of Um Rus Area, Central Eastern Desert, Egypt [D]: Ph. D. Thesis, El Minia Univer., 251 p. (unpublished)Google Scholar
  8. Geological Survey of Egypt, 1986, Gold in Egypt [Z]: A commodity package.Google Scholar
  9. Hass, J.L., 1976, Physical properties of the coexisting phases and thermochemical properties of the H2O component in boiling Na−Cl solutions [J]: U. S. Geol. Surv. Bull., v. 1421-A, 73p.Google Scholar
  10. Hussein, A.A., 1990, Mineral deposits, in R. Said, ed., The geology of Egypt: New York, Elsevier, Amsterdam, p. 511–566.Google Scholar
  11. Kamel, O., M. El-Mahallawy, and H. Hilmy, 1992, Mineralogy of the Um Rus gold-bearing quartz veins and the surrounding alteration zones [J]: Egypt, Mineralogist, v. 4, p. 55–86.Google Scholar
  12. Kamel, O., M. El-Mahallawy, E. Niazy, and H. Hilmy, 1998, Geochemistry of Um Rus gold-quartz veins, Central Eastern Desert, Egypt [J]: Egypt, Mineralogist, v. 10, p. 31–50.Google Scholar
  13. Kennedy, G.G., 1954, Pressure-volume-temperature relations in CO2 at elevated temperatures and pressure [J]: Am. Jour. Sci., v. 6, p. 1–12.Google Scholar
  14. Lee, C.A. and M. Tredoux, 1986, Platinum-group elements geochemistry of the Lower and Middle Group chromitites of the eastern Bushveld Complex [J]: Econ. Geol., v. 81, p. 1127–1139.CrossRefGoogle Scholar
  15. Leitch, C.H., C.T. Hood, X.L. Cheng, and A.J. Sinclair, 1991, Geology of Silver Queen mine area Owen Lake, Central British Columbia, B.C. Ministry of Energy [J]: Mines and Petroleum Resources, v. 1, p. 287–295.Google Scholar
  16. Ramboz, C., M. Picchavant, and A. Weisbrod, 1982. Fluid immiscibility in natural process: Use and misuse of fluid inclusion data, II. Interpretation of fluid inclusion data in terms of immiscibility [J]: Chem. Geol., v. 37, p. 29–48.CrossRefGoogle Scholar
  17. Roberts, R.G., 1988, Archaean lode gold deposits, in R.G. Roberts and P.A. Sheahan, eds., Ore deposit models [A]: Canada Geosciences, v. 4, p. 1–19.Google Scholar
  18. Shepherd, T.J., A.H. Rankin, and D.H. Alderton, 1985, A practical guide to fluid inclusion studies [M]: London, Blackie and sons, 239p.Google Scholar
  19. Takla, M., A.A. Eldougdoug, M.A. Gad, A.H. Rasmy, and H.K. El Tabbal, 1994–1995, Gold-bearing quartz veins in mafic and ultramafic rocks, Hutite and Um Tenedba, south Eastern Desert, Egypt [Z]: Egypt, Ann. Geol. Surv., v. XX, p. 411–432.Google Scholar
  20. Touray, J.C., 1987, Transport et depot de I'or dans les fluides de la croule continentale, I'apport des etudes d'inclusions fluides [J]: Chron. Rech. Min., v. 488, p. 43–50.Google Scholar
  21. Zhang, Y.G. and J.D. Frantz, 1987, Determination of the homogenization temperatures and densities of supercritical fluids in the system NaCl−KCl−CaCl2−H2O using synthetic fluid inclusions [J]: Chem. Geol. v. 64, p. 335–350CrossRefGoogle Scholar

Copyright information

© Science Press 2002

Authors and Affiliations

  • Mohamed El Tokhi
    • 1
  • Abdalla El Muslem
    • 2
  1. 1.Geology Department, Faculty of ScienceMansoura UniversityDamiettaEgypt
  2. 2.Geology Department Faculty of ScienceUnited Arab Emirates UniversityAl AinUnited Arab Emirates

Personalised recommendations