A Contribution to the Geochemical Atlas of the Kingdom of Saudi Arabia: Geochemical Survey of the Umm al Birak Quadrangle, 23D

SGS-TR-2010-3 Ibrahim O. Abdalla, Ahmed .H. Al-Johani,, Y.asir S. Al-Ghanmi, Mohammed .O. Al-Nashri, Abdulrahman A. Sabbahi, Abdullah Al-Eisa, and Mazen B. Balkheyour
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ICP and AAS analyses of the -2 mm / +0.177 mm fraction of 626 stream-sediment samples, collected in the Umm al Birak quadrangle over Late Proterozoic granitic and supracrustal basement terrain in the west and Tertiary lava flows in the east, have been used to identify anomalous and elevated multielement targets that are potentially favorable for sulfide and trace-element mineralization. The anomalies were identified from extensive examination of individual element distributions and associations.  Of the thirty-four identified anomalies, eight are rated as Priority 1, thirteen as Priority 2, and thirteen as Priority 3 based on their consistent elemental associations and their similarities with known ore-deposit types. The element associations of the eight Priority-1 anomalies are all suggestive of hydrothermal sulfide mineralization. The Priority 2 and Priority 3 anomalies show a variety of elemental associations, including chalcophile elements and REE anomalies.  Some of the delineated anomalies in Umm al Birak East, that are apparently associated with the Tertiary Rahat basalt, may in fact be derived from the Precambrian rocks beneath this cover.  The survey has identified regions of high element concentration that should be of interest to the mineral exploration companies, and makes a significant contribution to a high-quality geochemical database suitable for environmental monitoring, geological mapping, and land-use planning.



Abdalla, I.O, Al-Johani, A.H., Al-Ghanmi, Y.S., Al-Nashri, M.O., Sabbahi, A.A., Al-Eisa, A.M.I, and Balkheyour, M.B, 2011, A contribution to the Geochemical Atlas of the Kingdom of Saudi Arabia: Geochemical survey of the Umm al Birak  quadrangle, 23D: Saudi Geological Survey Technical Report SGS-TR-2010-3, 137 p., 145 figs. 8 tables, 2 apps.