Abstract
This study is concerned with the radioactivity and mineralogy of the younger granites and pegmatites in the Wadi Haleifiya area, southeastern Sinai Peninsula, Egypt. The area is occupied by metasediments, migmatites, older and younger granites. Most of these rocks, especially granites, are dissected by mafic and felsic dykes as well as pegmatites.
The younger granites are represented by three main varieties: monzogranites, syenogranites and alkali feldspar granites. The monzogranite consists essentially of quartz, plagioclase, potash feldspar and biotite with minor muscovite. Iron oxide, titanite, zircon and allanite are the main accessory minerals. Syenogranite is massive, medium- to coarse-grained and commonly exhibits equigranular and hypidiomorphic textures. It is made up essentially of potash feldspar, quartz, plagioclase and biotite. Iron oxides, allanite, epidote, titanite, and zircon are accessory minerals. The alkali feldspar granite consists mainly of perthite, quartz, alkali amphibole (arfvedsonite and riebekite), biotite, subordinate plagioclase and aegirine. Iron oxide, zircon and apatite are accessory minerals, whereas chlorite and sassurite are secondary minerals.
The altered monzogranite and pegmatite recorded high radioelement contents. The eU reaches up to 120 (av.=82×10−6) in the altered monzogranite and up to 55 (av.=27×10−6) in the pegmatites. The high radioactivity in the altered monzogranite is due to the presence of thorite, uranothorite and metamict zircon. In the pegmatites, it is related to the presence of uranophane, uranothorite, thorite, zircon, samarskite, monazite, xenotime, magnetite, ilmenite, hematite and rutile.
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References
Abdel-Karim A.M. (1992) “Petrology of Late Precambrian Younger Granites from Southwest Sinai” [C]. pp.267–272. Proc. 3rd Conf. Geol. Sinai Develop., Ismailia.
Abu El-Enen M.M. (1989). “Geological and Geochemical Studies on the Granitoid Rocks of Wadi Seih Area, Southwest Sinai, Egypt” [D]. M. Sc. Thesis, Mansoura Univ., Egypt.
Abu El-Leil I., Abdel Tawab M., and Abdel Wahab G. (1995) “Geology and Petrology of Some Migmatites and Granitoids of Gabal Sabbagh, South Sinai, Egypt” [M]. pp.39–70. Annals Geol. Surv., Egypt, XX, 39–70.
Akaad M.K. and Noweir A.M. (1980) “Geology and lithostratigraphy of the Arabian Desert orogenic belt of Egypt between latitudes 25°35′ and 26°30′N. In Evolution and Mineralization of the Arabian-Nubian Shield (eds. Cooray P.G. and Tahoun S.A.) [M]. Inst. Appl. Geol. Bull., Jeddah, Saudi Arabia. 4, 127–135.
Akaad M.K., Noweir A.M., and Kotb H. (1979) Geology and petrochemistry of the granitic association of the Arbian Desert Orogenic belt of Egypt between 25°53′ and 26°30′ N [J]. Delta J. Sci. 3, 107–151.
Ali B.H., Wild S.A., and Gabr M.M.A. (2008) Granitoid evolution in Sinai, Egypt based on precise SHRIMP U-Pb zircon geochronology, Gondwana Research. Doi:10.1016/j. gr 2008.06.009.
Azzaz S.A. (1993) Petrogensis of granitoid rocks of Wadi Baba area, Southern Sinai, Egypt [J]. JKAU Earth Sci. 6, 79–98.
Bea F. (1996) Residence of REE, Y, Th and U in granites and crustal protolith; Implications for the chemistry of crustal melts [J]. J. Petrol. 37, 521–552.
Bentor Y.K. (1985) The crustal evolution of the Arabian-Nubian massif with special reference to the Sinai Peninsula [J]. Precamb. Res. 28, 1–74.
Cesbron F., Ildefonse P., and Sichere M.C. (1993) New mineralogical data on uranophane and ß-uranophane: Synthesis of uranophane [J]. Mineralogical Magazine. 57, 301–308.
Chabaux F., Riotte J., and Dequincey O. (2003) U-Th-Ra Fractionation during weathering and River Transport. In Uranium-series Geochemistry (eds. Bourdon B., Henderson G.M., Lundstorm C.C., and Turner S.P.) [M]. Reviews in Mineralogy and Geochemistry, Geochmical Society of America, Washington. 52, 533–576.
Dana E.S. (1963) A Textbook of Mineralogy [M]. pp.851. John Wiley and Sons. Inc., New York and London.
Dosseto A., Turner S.P., and Chappell J. (2008) The evolution of weathering profiles through time: New insights from uranium-series isotopes [J]. Earth and Planetary Science Letters. 274, 359–371.
El Galy M.M. (1998) Geology, Radioactivity, Geochemistry and Tectonic Setting of Selected Granitic Rocks, West Gulf of Aquaba, Sinai, Egypt [D]. Ph.D. Thesis Tanta Univ., Egypt.
El Sheshtawy Y.A. (1984) Petrographical and Geochemical Studies of Granitic Rocks Around Wadi El Sheikh, Southwestern Sinai, Egypt [D]. Ph.D., Al Azhar Univ., Cairo, Egypt.
El-Gaby S. (1975) Petrochemistry and geochemistry of some granites from Egypt [J]. Neues Jb, Minal. Abh. Stuttgart. 124(2), 147–189.
El-Gaby S., List F.K., and Tehrani R. (1988) Geology, evolution and metallogenesis of the Pan-African Belt in Egypt. In The Pan-African Belt of Northeast Africa and Adjacent Areas (eds. El Gaby S. and Greilling R.O.) [M]. pp.17–68. Vieweg & Sons, Braunschweig/Wiesbaden.
El-Gammal E.A.E. (1986) Geology of the Granitoid Rocks of the Northwestern Part of the Basement Rocks in Sinai, Egypt [D]. Ph. D Thesis, Al-Azhar Univ., Egypt.
El-Maadawi W.A. (2010) Mineralogical, Geochemical and Radiometric Studies of Some Granitoid Rocks of Wadi Haleifiya Area, Southeastern Sinai, Egypt [M]. M. Sc. Faculty of Science, Ain Shams University. Cairo, Egypt.
El-Metwally A.A. (1993) Microgranular enclaves in the Pan African I-type granites from Sinai Massif. Petrology, mineralogy and geochemistry [J]. J. African Earth Sci. 17, 95–110.
El-Mowafy A.A. (1998) Geological, petrographical and radioactivity studies of Gabal Um Zariq-Wadi Kid area, Southeastern Sinai, Egypt [D]. pp.291. Ph. D. thesis. Mansoura Univ.
El-Ramly M.F. (1972) A new geological map for the basement rock in eastern and southwestern Desert of Egypt: scale 1:100000, Annals [J]. Geol. Surv. Egypt. 2, 1–18.
Finch R.J. and Ewing R.C. (1992) The corrosion of uraninite under oxidizing conditions [J]. Journal of Nuclear Material. 190, 133–156.
Frondel C. (1958) Systematic mineralogy of uranium and thorium [J]. U.S. Geol. Surv. Bull. 1064, 400.
Hanson S.L., Simons W.B., Falster A.U., Foord E.E., and Lichte F.E. (1999) Proposed nomenclature for samarskite-group minerals: New data on ishikawaite and calciosamarskite [J]. Mineral. Mag. 63, 27–63.
Hashad A.H. (1980) Present status of geochronological data on the Egyptian basement complex. In Evolution and Mineralization of the Arabian-Nubian Shield (eds. Cooray P.G. and Tahoun S.A.) [M]. Inst. Appl. Geol. Bull., Jeddah, Saudi Arabia. 4, 31–46.
Hassan M.A. and Hashad A.H. (1990) Precambrian of Egypt. In The Geology of Egypt (ed. Said R.) [M]. pp.201–245. Balkema, Rotterdam, Brookfield.
Hemly, J.J. and Jones W.R. (1964) Chemical aspects of hydrothermal alteration with emphasis on hydrogen metasomatism [J]. Econ. Geol. 59, 538–351.
Hussein A.A., Ali M.M., and EL-Ramly M.F. (1982) A proposed new classification of the granites of Egypt [J]. Jour. Volcano. Geotherm. Resear. 14, 187–198.
Ibrahim I.H. (1997) Geology and Radioactivity of the Basement Rocks of Wadi El Shallal Area, Southwestern Sinai, Egypt [D]. pp.156. Unpublished M. Sc., Thesis, Ain Shams University.
Jiashu R. and Zehong H. (1982) Geology of Granites and Their Metallogenetic Relations [C]. pp.26–30. Proceedings of the Intern Symposium, Nanjing University, Nanjing, China.
Korzeb S.L., Foord E.E., and Lichte F.E. (1997) The chemical evolution and paragenesis of uranium minerals from the Ruggles and Palermao granitic pegmatites, New Hampshire [J]. Canadian Mineralogist. 35, 135–144.
Matolin M.M. (1991) Construction and Use of Spectrometric Calibration Pads [R]. Laboratory of Gamma-ray spectrometry, N.M.A., Egypt. A report to the Government of the Arab Republic of Egypt. Project Egy/4/030-03, IAEA.
Nininger R.D. (1954) Minerals for Atomic Energy: A Guide to Exploration for Uranium, Thorium and Beryllium [Z]. pp.259. D. Van Nostrand Company Inc., Toronto.
Noweir A.M., Sewift B.M., and Abu El Ela A.M. (1990) Geology, petrography, geochemistry and petrogenesis of the Egyptian younger granites [J]. Qatar Univ. Sci. Bull. 10, 363–393.
Rogers J.J.W. and Greenberg J.K. (1981) Trace elements in continental margin magmatism: Part 3—Alkali granites and their relationship to cratonization [J]. Geol. Soc. Am. Bull. 92, 6–9.
Sherif, H. M. Y. (2003): Primary uranium mineralization of Wadi El-Beda Granite Pegmatite, South Sinai, Egypt [J]. Journal of Geology. 47/1, 175–188.
Speer J.A. (1980) Zircon [M]. In Reviews in Mineralogy 5: Orthosilicate (ed. Ribble P.H.) [M]. pp.67–112. Miner. Soc. Am., Washington D.C.
Stern R.J. (1979) Late Precambrian Ensimatic Volcanism in the Central Eastern Desert of Egypt [D]. pp.210. PhD. Thesis, San Diego, Univ. California.
Streckeisen A.L. (1976) To each plutonic rock its proper name [J]. Earth Sci. Rev. 12, 1–33.
Sweewald J.S. and Sayfried W.E. (1990) The effect of temperature on metal mobility in subsea floor hydrothermal systems: Constraints from basalt alteration experiments [J]. Earth Planet. Sci. Lett. 101, 388–403.
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El Gharbawy, R.I., El Feky, M.G., El Galy, M.M. et al. Petrological and mineralogical characteristics of younger granites and pegmatites in the Wadi Haleifiya area, southeastern Sinai, Egypt. Chin. J. Geochem. 30, 304–316 (2011). https://doi.org/10.1007/s11631-011-0514-6
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DOI: https://doi.org/10.1007/s11631-011-0514-6