Shaban, Amin
January 2008
Journal of Environmental Hydrology;2008, Vol. 16, p1
Academic Journal
Uranium exists in nature only as tetravalent (U4+) or hexavalent (U6+) compounds. From a geological point of view, the primary uranium mineral appears as tetravalent and is often found in acidic igneous rocks. It is converted in the surface oxidation zone to a secondary mineral where it becomes hexavalent. The latter is soluble and can be easily carried by surface or subsurface water until reenters a reducing environment where it deposits again in tetravalent form. Even though no acidic igneous rocks occur in the exposed rock formations of Lebanon, the occurrence of sandstone as a derivative of these rocks makes it favorable for uranium occurrence. In addition, the interbedding of shales, clays and lignite (as reducing agents) contribute to the favorability of uranium ore deposition. The location of Lebanon within the Mediterranean phosphatic belt, where uranium deposits often exist, adds another possibility for the natural occurrence of uranium ores. A ground radiometric survey, using a portable scintillometer has been carried out on selective sites in Lebanon, with a special emphasis on Neocomian-Barremian (sandstone and clay), Albian (shale) and Senonian (Marl) rock formations. Preliminary results show anomalous gamma radiation, which exceeded in many instances three times the background radiometric values. This is well pronounced in sandstone and clayey rocks. A detailed investigation should be carried out using gamma-ray spectrometers to build up a comprehensive survey on radioactivity type and concentration in the rocks of Lebanon.


Related Articles

  • Paleoproterozoic quartz-pebble conglomerate type uranium mineralisation in Mankarhachua area, Angul district, Orissa. CHAKRABARTI, KALYAN; ECKA, N. R. R.; MISHRA, B.; BABU, P. V. RAMESH; PARIHAR, P. S. // Journal of the Geological Society of India;May2011, Vol. 77 Issue 5, p443 

    Ground Radiometric survey of Paleoproterozoic pyritiferous quartz-pebble conglomerate (QPC) occurring to the north of Pallahara area led to the discovery of a QPC type uranium mineralisation near Mankarhachua village. Significant radioactivity is recorded in three sub-parallel uraniferous QPC...

  • Southern Tibet may be rich in uranium.  // Tibetan Review: The Monthly Magazine on all Aspects of Tibet;Oct2007, Vol. 42 Issue 10, p20 

    The article reports on the discovery of high content uranium by the scientists in Ladakh, India. The scientists have examined the samples of uranium-bearing magmatic rocks they gathered from the region and found out that they ontain an exceptionally high concentration ranging from 5.36% compared...

  • SANS investigation on pore surface roughening in rocks. Sen, D.; Mazumder, S.; Tarafdar, S. // Applied Physics A: Materials Science & Processing;Dec2002 Supplement, Vol. 74 Issue 6, ps1049 

    Pore-matrix interface and pore morphology in some metamorphosed, sandstones, and igneous rocks have been investigated by small-angle neutron scattering (SANS) to reveal the fractal nature of the interface. Multiple scattering effect for these specimens has also been looked into. The fractal...

  • A comparative study of aquifer systems occurring at the Paraná sedimentary basin, Brazil: U-isotopes contribution. Bonotto, D. // Environmental Earth Sciences;Mar2013, Vol. 68 Issue 5, p1405 

    The radioactivity due to U and U in three aquifer systems occurring within the Paraná sedimentary basin, South America, has been investigated. Uranium is much less dissolved from fractured igneous rocks than from the porous sedimentary rocks as indicated by the U-mobility coefficients between...

  • The first zircon U-Pb dating (SHRIMP II) for the silurian ophiolites in the Urals. Smirnov, V. N.; Ivanov, K. S. // Doklady Earth Sciences;Jan2010, Vol. 430 Issue 1, p15 

    The article discusses the results of the first zircon uranium-lead (U-Pb) dating of Silurian ophiolites at the Urals mountains in Russia. Researchers used the SHRIMP II ion microprobe, which revealed good evidence of Silurian ophiolites occurrence. Such occurrence of signs of layering and...

  • Stones Used in Masonry. Cramb, Ian // Art of the Stonemason;1992, p123 

    The article provides information on the stones used in masonry. Igneous rocks vary in their chemical and physical composition and it includes the granite types. Granite is used for engineering works, bridges, piers and foundations which require great strength or support for large weight. Aqueous...

  • Fire and Ice. Manz, Lorraine A. // NDGS Newsletter;Jan2013, Vol. 40 Issue 1, p22 

    The article focuses on the boulders found in the land surface of northern and eastern North Dakota. It states that a lithologically diverse assortment of high-grade metamorphic and igneous rocks consist the great majority of the boulders. It mentions that an erratic is a boulder that has been...

  • HEAVY MINERALS: A CASE STUDY ON THE GEBEL GHORABI MEMBER; BAHARIYA OASIS, WESTERN DESERT, EGYPT. Shehata, M. G.; Abdou, A. A.; El-Hariri, Tarek Y. M. A.; Mousa, Ahmed S. // International Journal of Academic Research;Jul2010, Vol. 2 Issue 4, p159 

    The study of the heavy minerals content separated from 83 sandstone samples representing the Gebel Ghorabi member (Lower Cenomanian) of Bahariya Formation revealed the predominance of ultrastable minerals derived originally from metamorphic and igneous rocks. The studied sandstones were affected...

  • Petrogenesis of Pre-caldera Mafic Lavas, Jemez Mountains Volcanic Field (New Mexico, USA). J. A. WOLFF; M. C. ROWE; R. TEASDALE; J. N. GARDNER; F. C. RAMOS; C. E. HEIKOOP // Journal of Petrology;Feb2005, Vol. 46 Issue 2, p407 

    The MioceneQuaternary Jemez Mountains volcanic field (JMVF), the site of the Valles caldera, lies at the intersection of the Jemez lineament, a Proterozoic suture, and the Cenozoic Rio Grande rift. Parental magmas are of two types: K-depleted silica-undersaturated, derived from the partial...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics