TITLE

GEOLOGICAL PROSPECTS FOR URANIUM ORE DEPOSITS IN LEBANON

AUTHOR(S)
Shaban, Amin
PUB. DATE
January 2008
SOURCE
Journal of Environmental Hydrology;2008, Vol. 16, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
36182252

 

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