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Mineralogy and fluid inclusions evidence for the genesis of molybdenite mineralization at Gabal Gattar, North Eastern Desert, Egypt

  • S. I. SCJGE-1 2019
  • Published:
Arabian Journal of Geosciences Aims and scope Submit manuscript

Abstract

Molybdenite mineralization is located at the northern periphery of Gabal Gattar granite. Molybdenite-bearing quartz veins are well developed within the granitic rocks in the northern part of the pluton. These veins are striking mainly NNE. Wall rock alteration represented by silicification, kaolinitization and serecitization. The study of ore mineral assemblage revealed the relative predominance of molybdenite, beside gold, silver and bismuth, whereas wulfenite, hubnerite, columbite, tantalite, goethite and jarosite are rare minerals. Ore bodies of sulphide phase are quite poor and represented by minor quantities of pyrite, chalcopyrite, galena and sphalerite. Fluid inclusion microthermometry confirmed the presence of two types of fluid inclusions. Primary two-phase aqueous inclusions (L + V) as type 1 and secondary two-phase aqueous inclusions (L + V) as type 2. The secondary inclusions are the most abundant type in quartz vein bearing molybdenite. They are arranged along healed fractures displaying oval, sphere or elongated shapes and up to 24 μm in size. Fluid inclusion study indicates that fluids infiltrated in Gattar granite were generally low salinity from 1 to 6 wt.% NaCl eq. with a maximum peak at 1 wt.% NaCl eq. with temperatures from 149.7 to 272.3 °C with majorities at 220 °C and pressures between 35 and 100 bars. The decreasing of homogenization temperatures (Th) with salinity may indicate protracted mixing of two fluids that facilitated the attainment of thermal equilibrium as well as chemical homogeneity.

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References

  • Abu Zeid M (1995) Relation between surface and subsurface uranium mineralization and structural features, Gabal Qattar, North Eastern Desert, Egypt. M.Sc. Thesis, Fac. Sci., Ain Shams Univ., Cairo, Egypt, p 208

  • Ali KA, Zoheir BA, Stern RJ, Andresen A, Whitehouse MJ, Bishara WW (2016) Lu–Hf and O isotopic compositions on single zircons from the North Eastern Desert of Egypt, Arabian–Nubian Shield: implications for crustal evolution. Gondwana Res 32:181–192

    Article  Google Scholar 

  • Barnes HL (1979) Solubility's of ore minerals. In: Barnes HL (ed) Geochemistry of hydrothermal ore deposits. Wiley-Intersciences, New York, pp 404–508

    Google Scholar 

  • Barthoux J (1922) Chronologie et description des roches igness du desert arabique. Men Inst Egypte, le Caire 5:262

  • Bodnar RJ (1993) Revised equation and table for determining the freezing point depression of H2O-NaCl solutions. Geochim Cosmochim Acta 57:683–684

    Article  Google Scholar 

  • Brantley SL (1992) The effect of fluid chemistry on quartz microcracks lifetimes. Earth Planet Sci Lett 113:145–156

    Article  Google Scholar 

  • Candela PA, Holland HD (1986): A mass transfer model for copper and molybdenum in magmatic hydrothermal systems; the origin of porphyry-type ore deposits. Econ. Geol. 81, 1–19.

  • Cathelineau M (1988) Cation site occupancy in chlorites and illites as a function of temperature. Clay Miner 23:471–485

    Article  Google Scholar 

  • Cathelineau M, Nieva D (1985) A chlorite solid solution geothermometer. The Los Azufres (Mexico) geothermal system: Contrib. Mineral Petrol 91:235–244

    Article  Google Scholar 

  • Dardir AA, Abu Zeid KM (1972) Geology of the basement rocks between lat. 27°00′N and 27°30′N, Eastern Desert of Egypt Ann Geol Surv Egypt II 129–160

  • Dardir AA, Abu Zeid KM, Gadalla SH (1983) Molybdenite deposits of Gebel Gattar area. Ann Geol Surv Egypt, XIII: 23–37

  • El Rakaiby ML, Shalaby MH (1992) Geology of Gabal Gattar batholiths, Central Eastern Desert, Egypt. Int J Remote Sens 13:2337–2347

    Article  Google Scholar 

  • El-Balakssy SS (2012) Mineralogy of the radioactive occurrence at the northern periphery of Gabal Gattar granites, North Eastern Desert, Egypt. Nuclear Sci J 1:23–42

  • El-Sayed MM, Shalaby MH, Hassanen MA (2003) Petrological and geochemical constraints on the tectonomagmatic evolution of the late Neoproterozoic granitoid suites in the Gattar area, north Eastern Desert, Egypt. Neues Jahrbuch für Mineralogie Abhandlungen 179:1–42 (178, 239–275)

  • Esmail EM (2005) Subsurface geological constraints controlling uranium mineralization at the northern part of Gabal Gattar, North Eastern Desert, Egypt, Ph.D. Thesis, Fac. Sci., Ain Shams Univ., Cairo, Egypt, p 250

  • Evans AM (1980) An introduction to ore geology. Geosci Texts 2

  • Exley CS (1976) Observation on the formation of kaolinite in the St. Austell granite, Corn. Wall, Clay Miner 11:51–63

    Article  Google Scholar 

  • Ghobrial MG, Lotfy M (1967) The geology of Gabal Gattar and Gabal Dokhan areas, Eastern Desert. Geol Surv Egypt, paper No. pp 40, 26

  • Guilbert JM, Park CF (1986) The geology of ore deposits. Freeman and company, New York, p 985

    Google Scholar 

  • Hegeson JJ (1974) Chemical aspects of hydrothermal alteration with emphasis on hydrogen metasomatism. Econ Geol 59:538–569

    Google Scholar 

  • Helmy HM, Kaindl R, Shibata T (2014) Genetically related Mo–Bi–Ag and U–F mineralization in A-type granite, Gabal Gattar, Eastern Desert, Egypt. Ore Geol Rev 62:181–190

    Article  Google Scholar 

  • Hemley JJ, Jones WR (1964) Chemical aspects of hydrothermal alteration with emphasis on hydrogen metasomation. Econ Geol 59:538–569

    Article  Google Scholar 

  • Hey MH (1954) A new review of the chlorites. Mineral Mag 30:277–292

    Google Scholar 

  • Hume WF (1934) Geology of Egypt, II, part I and II. Survey of Egypt, Cairo

  • Jasinski AW (1988) Activity diagrams for the MgO-Na2O-K2O-SiO2-Al2O3-H2O-HCl system in the temp. range 298-623 and 1 K bar pressure, Bergslagen, Sweeden. Geol Mijndovw 67:379–395

  • Kranidiotis P, MacLean WH (1987) Systematics of chlorite alteration at the Phelps Dodge massive sulfide deposit, Matagami, Quebec. Econ Geol 82:1898–1911

    Article  Google Scholar 

  • Mahdy NM, Kalioubi BA, Wohlgemuth-Ueberwasser CC, Shalaby MH, El-Afandy AH (2015) Petrogenesis of U- andMo-bearing A2-type granite of the Gattar batholith in the Arabian Nubian Shield, Northeastern Desert, Egypt: evidence for the favorability of host rocks for the origin of associated ore deposits. Ore Geol Rev 71:57–81

    Article  Google Scholar 

  • Nossair AA (2005) Geological factors controlling uranium distribution and affecting its localization in G-II occurrence, Gabal Gattar, NED, Egypt. M.Sc. Thesis, Fac. Sci., Zagazig Univ., Benha, p 179

  • Pal DC, Panigrahi MK, Mishra B (2006) Contrasting fluid inclusion characteristics of stanniferous and non-stanniferous pegmatites of Southeast Bastar, Central India. Asian Earth Sci J 28:306–319

  • Rice CM (1973) Chemical weathering on the Carnmenellis granite. Mineral Mag 39:429–447

    Article  Google Scholar 

  • Richard LR (1995) Mineralogical and Petrological data processing system. Minpet software (c), 1988–1995, Version 2.02

  • Roedder E (1979) Fluid inclusions as samples of ore fluids. In: Barnes HL (ed) Geochemistry of hydrothermal ore deposits, 2nd edn. Wiley-Interscience, New York, pp 684–737

    Google Scholar 

  • Roedder E (1984) Fluid inclusions. Reviews in Mineralogy. Ribbe PH (ed). Mineral. Soc. Am., V. 12, p 644

  • Roz ME (1994) Geology and uranium mineralization of Gabal Gattar, North Eastern Desert, Egypt. M.Sc. Thesis, Faculty of Science, Cairo Univ., p 175

  • Said R (1962) The geology of Egypt. Elsevier Publ Co, Amsterdam and New York, p 377

    Google Scholar 

  • Said R (1990) The geology of Egypt. A.A. Balkema, Roterdam, p 734

    Google Scholar 

  • Salman AB, El Aassy IE, Shalaby MH (1986) New occurrence of uranium mineralization in Gabal Gattar, Northern Eastern Desert, Egypt. Ann Geol Surv Egypt, XVI, pp 31–34

  • Salman AB, Shalaby M, Noseir L, El Kholy D, Roz M, Abu Zeid M, Mostafa M, Amin N, Ayoub R, Khamis H (1994) Gabel Gattar prospect, an obvious model of intragranitic uranium mineralization. 2nd Arab Conf. Peaceful uses of Atomic Energy, Cairo, 5-9 Nov., AAEA

  • Salman AB, El Kholy DM, El Zalaky MA (2005) Relation between granite plutonism, fulting and uranium mineralization in the northern part of Gabal Qattar area, Northern Eastern Desert, Egypt Al-Azhar. Bull Sci 16:23–35

  • Schurmann HME (1966) The Precambrian along the Gulf of Suez and the northern part of the Red Sea. E. J. Brill. Leiden

  • Seward TM (1973) Thio-complexes of gold and the transport of gold in hydrothermal ore solutions. Geochimica Et Cosmochimica Acta 37:379–399

  • Seward TM (1976) Stability of chloride complexes of silver in hydrothermal solutions up to 350°C. Geochim Cosmochim Acta 40:1329–1341

    Article  Google Scholar 

  • Shalaby MH (1995) New occurrence of uranium mineralization G-VII, Gabal Qattar uranium prospect, North Eastern Desert, Egypt. Bull Fac Sci Alex Univ 35:447–460

  • Shepherd TJ, Rankin AH, Alderton DHM (1985) A practical guide to fluid inclusion studies. Chapman and Hall, p 239

  • Willis KM, Stern RJ, Clauer N (1988) Age and geochemistry of late Precambrian sediments of the Hammamat series from the Northeastern Desert of Egypt. Precambrian Res 42:173–187

    Article  Google Scholar 

Download references

Acknowledgements

The authors are sincerely grateful to Dr. M. Abd el-Monsef for help with fluid inclusion studies and Dr. T. Abu Alam for help with EMP analyses.

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Authors and Affiliations

  1. Geology Department, Faculty of Science, Tanta University, Tanta, Egypt

    Ibrahim Abdel Nagi Salem, Bothina Taha El Dosuky, Gaafar Abd El- Alim El Bahariya & Eman Fathy Refaey

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  1. Ibrahim Abdel Nagi Salem
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  2. Bothina Taha El Dosuky
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  3. Gaafar Abd El- Alim El Bahariya
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  4. Eman Fathy Refaey
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Correspondence to Eman Fathy Refaey.

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This article is part of the Topical Collection on Current Advances in Geological Research of Egypt

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Salem, I.A.N., El Dosuky, B.T., El Bahariya, G.A.E . et al. Mineralogy and fluid inclusions evidence for the genesis of molybdenite mineralization at Gabal Gattar, North Eastern Desert, Egypt. Arab J Geosci 13, 369 (2020). https://doi.org/10.1007/s12517-020-05322-w

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