PGE exploration in the Wadi Amarah complex, southwestern Arabian Shield

  • Ahmad M. Al-Saleh
Original Paper


A stream sediment survey targeting PGE and their pathfinders was carried out at a gabbro/pyroxenite complex in Wadi Amarah in the SW Arabian Shield. Twenty-nine stream sediment samples were collected from wadi channels and analyzed for PGE and base metals. None of the samples contained detectable PGE except for WAS-3 and WAS-27 which returned values above 70 ppb of combined Pt and Pd; these two locations are also anomalous for Au. A follow-up survey was conducted to further investigate the anomalies at these locations. A total of 48 soil and rock samples were collected from the two anomalous localities. Unlike the initial survey, most samples contained detectable PGE and Au albeit not as high as the original anomalies. Factor analysis of the results from the initial survey returned five main factors, with the first four reflecting the effects of mineral detritus as well as adsorption onto Fe–Mn oxyhydroxides; however, the last factor is loaded only for Cu and Ni and is therefore considered an ore factor indicating the presence of Cu–Ni sulphides. Another five factors were obtained from the follow-up survey, and as was the case in the initial survey, the first four factors are detrital/adsorption-related, while factor 5 has high loadings for only Pd and Pt and is therefore interpreted as a PGE ore factor. These findings reveal different modes of dispersion of PGE and base metals in the secondary environment and, more importantly, demonstrate the effectiveness of factor analysis in detecting even faint anomalies from disseminated mineralization.


Arabian Shield PGE Pyroxenite Geochemical exploration Factor analysis 



Yves Thibault is thanked for his assistance with EPMA work at UWO.

Funding information

This project was funded by King Abdul-Aziz City for Science and Technology (KACST) through the applied research grant no. AR-16-5. Some of the petrological and analytical work was carried out using the facilities at King Saud University and the University of Western Ontario (UWO), Canada.


  1. Al-Saleh AM (2007) Exploration for PGE in the Rugaan layered intrusion: an Alaskan-type complex from the Eastern Arabian shield. Ann Geol Surv Egypt 29:237–251Google Scholar
  2. Al-Saleh (in press) Enhancement of stream-sediment dispersion trails using R-mode factor analysis: an example from Wadi Kamal layered complex, NW Arabian Shield. Geochem Explor Environ AnalGoogle Scholar
  3. Amlas M, Basahel AN, Divi SR (1983) Polyphase Deformation in a Dome-and Mushroom Structure Near Khamis Mushyat, Southern Arabian Shield. Bull Fac Earth Sci, KAU 6:409420Google Scholar
  4. Barbier J (1987) Arid environment geochemical exploration in Saudi Arabia: the problem of aeolian contamination. J Geochem Explor 27:29–51CrossRefGoogle Scholar
  5. Cameron EM, Hattori KH (2005) Platinum group elements in geochemical exploration. Mineralog Assoc Canada Short Course 35:287–307Google Scholar
  6. Chu MF, Wang KL, Griffin WL, Chung SL, O’Reilly SY, Pearson NJ, Iizuka Y (2009) Apatite composition: tracing petrogenetic processes in Transhimalayan granitoids. J Petrol 50(10):1829–1855CrossRefGoogle Scholar
  7. Coleman R (1973) Reconnaissance geology of the Khamis Mushayt quadrangle, Kingdom of Saudi Arabia. Saudi Arabian Directorate General Mineral Resources Geologic Map GM-5, scale, 1(100,000)Google Scholar
  8. Coleman RG, Brown GF, Keith TEC (1972) Layered gabbros in southwest Saudi Arabia. US Geological Survey professional paper, pp D143-D150Google Scholar
  9. Coleman RG, Ghent ED and Fleck RJ (1977) Jabal Shai gabbro in southwest Saudi Arabia; Directorate General of Mineral Resources, Mineral. Resources Bull 17, 46pGoogle Scholar
  10. Collenette P and Grainger DJ (1994) Mineral resources of Saudi Arabia. Saudi Arabian Directorate General of Mineral Resources Special Publication, SP-2, 322 pGoogle Scholar
  11. Divi RS, Amlas MA, Qari MY (2001) Interplay of horizontal and vertical tectonics in the southern part of the Asir terrane in the Arabian Shield. Gondwana Res 4(2):155–158CrossRefGoogle Scholar
  12. Flowerdew MJ, Whitehouse MJ, Stoeser DB (2013) The Nabitah fault zone, Saudi Arabia: a Pan-African suture separating juvenile oceanic arcs. Precambrian Res 239:95–105CrossRefGoogle Scholar
  13. Fujii H, Kato K (1979) Geochemical reconnaissance in the northern Wadi Shwas area (19–20/41–42), DGMR Tech. Rep., TR-1979-6, pp 14Google Scholar
  14. Gonçalves GO, Lana C, Scholz R, Buick IS, Gerdes A, Kamo SL, Corfu F, Marinho MM, Chaves AO, Valeriano C, Nalini HA (2016) An assessment of monazite from the Itambé pegmatite district for use as U–Pb isotope reference material for microanalysis and implications for the origin of the “Moacyr” monazite. Chem Geol 424:30–50CrossRefGoogle Scholar
  15. Greenwood WR (1985) Geologic map of the Abha quadrangle, sheet 18F, Kingdom of Saudi Arabia. Saudi Arabian Deputy Ministry For Mineral Resources Geoscience Map GM 75C, scale 1:250 000, with Text, 27pGoogle Scholar
  16. Hattori KH, Cameron EM (2004) Using the high mobility of palladium in surface media in exploration for platinum group element deposits: evidence from the Lac des Iles region, northwestern Ontario. Econ Geol 99(1):157–171Google Scholar
  17. Hinchey JG, Hattori KH (2005) Magmatic mineralization and hydrothermal enrichment of the high grade zone at the Lac des Iles palladium mine, northern Ontario, Canada. Mineral Deposita 40(1):13–23CrossRefGoogle Scholar
  18. Johnson PR (2006) Explanatory notes to the map of Proterozoic geology of western Saudi Arabia: Saudi Geological Survey Technical Report SGS-TR-2006-4, 62 p., 22 figs., 2 platesGoogle Scholar
  19. Johnson PR, Kattan FH (2012) The geology of the Saudi Arabian Shield. Saudi Geological Survey, Jeddah 479 pGoogle Scholar
  20. Johnson PR, Woldehaimanot B (2003) Development of the Arabian-Nubian shield: perspectives on accretion and deformation in the northern east African Orogen and the assembly of Gondwana. Geol Soc Lond, Spec Publ 206(1):289–325CrossRefGoogle Scholar
  21. Johnson PR, Kattan FH, Wooden JL (2001) Implications of SHRIMP and microstructural data on the age and kinematics of shearing in the Asir terrane, southern Arabian shield, Saudi Arabia. Gondwana Res 4(2):172–173CrossRefGoogle Scholar
  22. Johnson P, Andresen A, Collins AS, Fowler TR, Fritz H, Ghebreab W, Kusky T (2011) Late Cryogenian–Ediacaran history of the Arabian–Nubian Shield: a review of depositional, plutonic, structural, and tectonic events in the closing stages of the northern East African Orogen. Afr J Earth Sci 61:167–232CrossRefGoogle Scholar
  23. Johnson PR, Halverson GP, Kusky TM, Stern RJ, Pease V (2013) Volcanosedimentary basins in the Arabian-Nubian shield: markers of repeated exhumation and denudation in a Neoproterozoic accretionary orogen. Geosciences 3(3):389–445CrossRefGoogle Scholar
  24. Maier WD (2005) Platinum-group element (PGE) deposits and occurrences: mineralization styles, genetic concepts, and exploration criteria. J Afr Earth Sci 41(3):165–191CrossRefGoogle Scholar
  25. Malitch KN, Melcher F, Mühlhans H (2001) Palladium and gold mineralization in podiform chromitite at Kraubath, Austria. Mineral Petrol 73(4):247–277CrossRefGoogle Scholar
  26. Naldrett AJ (2013) Magmatic sulfide deposits: geology, geochemistry and exploration. Springer Science & Business Media, pp 186Google Scholar
  27. Nehlig P, Salpeteur I, Asfirane F, Bouchot V, Eberlé JM, Genna A (1999) The mineral potential of the Arabian shield: a reassessment. In Proceedings of the IUGS/UNESCO Meeting on the “Base and Precious Metal Deposits in the Arabian Shield”, Jeddah, November pp 12–19Google Scholar
  28. Olivo GR, Theyer P (2004) Platinum-group minerals from the McBratney PGE–Au prospect in the Flin Flon Greenstone Belt, Manitoba, Canada. Can Mineral 42(2):667–681CrossRefGoogle Scholar
  29. Pertsev AN, Aranovich LY, Prokofiev VY, Bortnikov NS, Cipriani A, Simakin SS, Borisovskiy SE (2015) Signatures of residual melts, magmatic and seawater-derived fluids in oceanic lower-crust gabbro from the Vema lithospheric section, Central Atlantic. J Petrol 56(6):1069–1088CrossRefGoogle Scholar
  30. Rakovan JF, Hughes JM (2000) Strontium in the apatite structure: strontian fluorapatite and belovite-(Ce). Can Mineral 38(4):839–845CrossRefGoogle Scholar
  31. Reimann C, & De Caritat P (2012) Chemical elements in the environment: factsheets for the geochemist and environmental scientist. Springer Science & Business MediaGoogle Scholar
  32. Robinson FA, Foden JD, Collins AS, Payne JL (2014) Arabian Shield magmatic cycles and their relationship with Gondwana assembly: insights from zircon U–Pb and Hf isotopes. Earth Planet Sci Lett 408:207–225CrossRefGoogle Scholar
  33. Schemel LE, Kimball BA, Runkel RL, Cox MH (2007) Formation of mixed Al–Fe colloidal sorbent and dissolved-colloidal partitioning of Cu and Zn in the cement creek–Animas River confluence, Silverton, Colorado. Appl Geochem 22(7):1467–1484CrossRefGoogle Scholar
  34. Sener AK, Grainger CJ, Groves DI (2002) Epigenetic gold–platinum-group element deposits: examples from Brazil and Australia. Appl Earth Sci 111(1):65–73CrossRefGoogle Scholar
  35. Smith KS (1999) Metal sorption on mineral surfaces: an overview with examples relating to mineral deposits. Environ Geochem Miner Deposits B Case Stud Res Topics 6:161–182Google Scholar
  36. Stoeser DB, Frost CD (2006) Nd, Pb, Sr, and O isotopic characterization of Saudi Arabian shield terranes. Chem Geol 226(3):163–188CrossRefGoogle Scholar
  37. Thomson I (1978) Geochemical orientation studies, Kingdom of Saudi Arabia. Unpublished report, RiofinexGoogle Scholar
  38. Weijermars R, Khan MA (2000) Mid-crustal dynamics and island-arc accretion in the Arabian Shield: insight from the Earth’s natural laboratory. Earth Sci Rev 49(1):77–120CrossRefGoogle Scholar
  39. Wood SA (2002) The aqueous geochemistry of the platinum-group elements with applications to ore deposits. Geol Geochem Miner Miner Benefic Platinum-Group Elem 54:211–249Google Scholar
  40. Zhu XK, O’Nions RK (1999) Monazite chemical composition: some implications for monazite geochronology. Contrib Mineral Petrol 137(4):351–363CrossRefGoogle Scholar

Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  1. 1.Department of Geology and Geophysics, Faculty of ScienceKing Saud UniversityRiyadhSaudi Arabia

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