07 algeria sandstone aiea

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07 algeria sandstone aiea

  1. 1. INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA) Technical Meeting on origin of sandstone uranium deposits : A global perspective Khaldi A., Nacer JE., Badani A., Mokhtar SA.Centre de Recherche Nucléaire de Draria – Commissariat à l’Energie Atomique - Algeria Vienna, Austria, 29 May – 1 June 2012
  2. 2. We are pleased to present you today the results of theuranium prospection in the Tin Seririne basin in themeridional margin of the Hoggar.This results are included in a sedimentological fit to try toelucidate the uraniferous highlighted occurrencedistribution in order to contribute to develop anexploration program framework in this region.
  3. 3.  PRESENTATION OF THE STUDY AREA. SOME URANIUM REGIONALE METALLOGENY CONSIDERATIONS OF THE ALGERIA-NIGER CROSS-BORDER REGION. MAIN FEATURES OF URANIUM OCCURRENCES DISCOVERED IN THE TIN SERIRINE REGION. REGIONAL DISTRIBUTION OF THE TIN SERIRINE - TIM MERSOÏ URANIUM MINERALIZATIONS. CONTRIBUTION OF SEQUENCE STRATIGRAPHY TO URANIUM EXPLORATION - CASE OF THE TIN SERIRINE REGION. RESEARCH PERSPECTIVE OF URANIUM OCCURRENCES.PALEOZOIC AND GONDWANA SEQUENCES SYNTHESIS
  4. 4. Geographical situationof Tin Séririne sedimentary basin(Tassil Oua NAhaggar, Sud-Est du Hoggar)
  5. 5. Concerning geology, the Tin Seririne sedimentary basinbelongs to the Oua n’Ahaggar Tassili wich represents thePALEOZOIC COVER of the southern edge of the central Hoggar.It is constituting the EXTEND to the north of the TIM MERSOIsedimentary basin (Niger) known for its uranium potential.
  6. 6. Geological context of Tin Séririne sedimentary basin (Tassil Oua NAhaggar, South-East of Hoggar)
  7. 7. The regional geological study of this southern part of thesaharian platform has identified three main geologicalelements wich have conditionned the geological history ofthis cross-border region: The Issalane – Aïr mole (uplift block) and his anorogenic volcanic province (paleozoic); The flexure fault of In Azaoua – Arlit; The sedimentary area of Tin Séririne – Tim Mersoï basins.
  8. 8. 7° 1 2 3 4 5 6 7 8 Tamanrasset 9 10 11 12 13 14 15 16 Bassin de ISSALANE Tin Seririne 21° 1. Neogene and Quaternary 2. Tertiary and quaternary volcanism21° In Azzaoua 3. Cretaceous 4. Jurassic 5. Trias 6. Carboniferous 7. Devonian 8. Silurian 9. Cambrian-Ordovician 10. Intermediate series (Eocambrian) In Guezzam 11. Western Hoggar (Pharusian chain) 12. Middle Hoggar (Polycyclic) 13. Easter Hoggar (Tiririne chain) AÏR 14. Anorogenic volcanism of Aïr Bassin 15. Faults de Tim Mersoï Agadès 0 100 200 300 400km 7° Geological scheme of Tin Séririne – Tim Mersoî area
  9. 9. For uranium prospection in Tin Séririne region, allgeological and geophysical technics and methodshave been implemented: Geological survey. Geophysical survey. Airborne Geophysical survey.
  10. 10. DepositsUranium Mineralization GEOLOGICAL MAP OF TIN SERIRINE BASIN
  11. 11. Confirmedradiometric anamoly TAHAGGART RADIOMETRIC MAP OF ASSEO AREA - AEROGEOPHYSICAL SURVEY -
  12. 12. SEROUENOUT TERRANE MOLE OF ISSALANE 7°30’ FAULTMAGNETIC MAP OF ASSEO AREA - AEROGEOPHYSICAL SURVEY -
  13. 13. In Azzaoua – Arlit Fault Deformingthe ordovician sandstones
  14. 14. W E Thrust plane Ordovician Precambrian basement sandstonesOverthrust of the precambrian basement on the paleozoic cover underlining the hercynian event in Tin Séririne region
  15. 15. URANIUM EXPLORATION RESULTS IN TIN SERIRINE BASINThree uranium mineralized horizons have beenidentified : Precambrian basement – Paleozoic cover interface; Base of lower Devonian ; Base of lower Visean.
  16. 16. Quaternary Lower Carboniferous Middle to upper Devonian Lower Devonian Silurian Cambrian-Ordovician Precambrian basement Fault Basement-Cover interface Sandstone at the base of the Devonian Sandstone at the base of the Visean Tahaggart Deposit Uranium occurrence Significant radiometric anomaly Radiometric anomaly THE RESULTSOF THE URANIUM EXPLORATION IN TIN SERIRINE BASIN
  17. 17. Two types of uraniferous mineralizations are targeted : Precambrian basement-paleozoïc cover unconformity -related mineralization : « Tahaggart type ». Continental sandstone-related mineralization of the base of lower Devonian : « Arlit type ».
  18. 18. Ordovician sandstones: The internal Tassili « Tahaggart region »
  19. 19. Ordovician sandstone Basal conglomerate Ferrugination Altered gneissTHE URANIUM MINERALIZATION IN THE BASEMENT-COVER INTERFACE - Type Tahaggart -
  20. 20. Distribution of uranium mineralization in the basement-cover interface
  21. 21. Distribution of uranium mineralization in the basement-cover interface
  22. 22. In the unconformity-related mineralizationtype, the regolith shows a significant weatheringof the rock where kaolinization and ferruginationare dominating.The mineralization is dominated by phosphatic andvanadiferous uranium minerals such as: Autunite , Yellow mineral. Torbernite , Green mineral. Carnotite , Yellow mineral.
  23. 23. FERRUGINATION KAOLINIZATION
  24. 24. FERRUGINATION
  25. 25. MINERALIZED BASAL CONGLOMERATE OF ORDOVICIAN
  26. 26. ALTERED AND MINERALIZED RHYOLITE (REGOLITH)
  27. 27. URANIUM MINERALIZATION IN PLACE (REGOLITH)
  28. 28. Sandstones of lower Devonian : External Tassili « Timouzeline region »
  29. 29. Basal sandstone formation of lower Devonian : External Tassili (I Meskour formation -Timouzeline region)
  30. 30. Efei mazerta formation of lower Devonian : External Tassili (In Azzaoua region)
  31. 31. Feldspathic sandstone formation of Timouzeline : External Tassili (Lower Devonian – Timouzeline region)
  32. 32. Feldspathic sandstone formation of Timouzeline : External Tassili (Lower Devonian – Timouzeline region)
  33. 33. The three identified regional horizons bearing uraniumoccurrences (Cambrian-Ordovician, lower Devonian andlower Visean) in the Tin Seririne basin, allowed us toidentify, broadening to the uranium occurrences anddeposits of Tim Mersoï basin : The Tamesna cross-border (Tin Séririne-Tim Mersoi) metallogenic province; A metallogic permanence from the Cambo-ordovician (Tahaggart in Algeria) to the Cretaceous (Azélik in Niger).
  34. 34. Quaternary Lower Carboniferous Middle to upper Devonian Lower Devonian Silurian Cambrian-Ordovician Precambrian basement Fault Basement-Cover interface Lower sandstone whole of Devonian Lower sandstone whole of Carboniferous Tahaggart Deposit Uranium occurrence Significant radiometric anomaly Radiometric anomaly REGIONAL HORIZONSBEARING URANIUM OCCURRENCES IN TIN SERIRINE BASIN
  35. 35. 7° 1 2 3 4 5 6 7 8 Tamanrasset 9 10 11 12 13 14 15 16 Bassin de ISSALANE 21° 1. Neogene and Quaternary Tin Seririne 2. Tertiary and quaternary volcanism 3. Cretaceous; 4. Jurassic; 5. Trias21° In Azzaoua 6. Carboniferous; 7. Devonian; 8. Silurian 9. Cambrian-Ordovician 10. Intermediate series (Eocambrian) 11. Western Hoggar (Pharusian chain) 12. Middle Hoggar (Polycyclic) 13. Easter Hoggar (Tiririne chain) 14. Anorogenic volcanism of Aïr 15. Faults In Guezzam 16. Uranium deposits and occurrences. AÏR Bassin de Tim Mersoï Agadès 0 100 200 300 400km 7° Uranium Province of Tamesna (Tin Séririne – Tim Mersoi)
  36. 36. PALEOZOIC SEQUENCES AND STRATIGRAPHYWe have included all results in a sedimentologicalapproach to try to elucidate the highlighteduranium occurrence distribution in this region.
  37. 37. LITHOSTRATIGRAPHIC COLUMN OF TIN SERIRINE REGION(OUA NAHAGGAR Tassili - South-East Hoggar)
  38. 38. SEQUENCE ANALYSIS OF PALEOZOIQUES SERIES OF TIN SERIRINE REGION(OUA NAHAGGAR Tassili - South-East Hoggar)
  39. 39. Khaldi A. Plate-forme saharienne (Sud du Hoggar) Fekirine et Abdallah (1998) Plate-forme saharienne (Nord du Hoggar) PALEOZOIC SERIES CORRELATION BETWEENNORTHERN AND SOUTHERN MARGINS OF THE SAHARAN PLATFORM
  40. 40. EL-HAMET M.O. Bassin de Tim Mersoi (NIGER) Khaldi A. Plate-forme saharienne (Sud du Hoggar) PALEOZOIC SERIES CORRELATION BETWEEN Fekirine et Abdallah (1998)TIN SERIRINE (ALGERIA) AND TIM MERSOI (NIGER) BASINS Plate-forme saharienne (Nord du Hoggar)
  41. 41. EL-HAMET M.O. Bassin de Tim Mersoi (NIGER) Khaldi A. Plate-forme saharienne (Sud du Hoggar) Fekirine et Abdallah (1998)LOCALIZATION OF BEARERS LEVELS OF URANIUM OCCURRENCES Plate-forme saharienne (Nord du Hoggar) TIN SERIRINE (ALGERIA) AND TIM MERSOI (NIGER) BASINS
  42. 42. CONCLUSION, the uranium concentrations encased in Paleozoicsedimentary series are located systematically in the coarsesandstone formations corresponding to low-level suite (Lowstandwedge System Tract.) in close relationship with Ordovician baseunconformity sequences (Tahaggart), Devonian (Tamart-N-Iblis -Timouzeline) and Carboniferous (Arlit - Arlette - Akouta -Madaouela). The existence of significant secondary uraniumminerals concentrations, as phosphates and vanadates ofuranium, shows that these deposits have undergone lateremobilization.The genesis of these mineral concentrations is very tightlycontrolled by three main regional factors: Sedimentology (coarsesandstones) and tectonics (In Azzaoua-Arlit lineament), the redoxphenomena (geochemical zonation) and acid volcanism (Aïranorogenic province) presented as the primary source of thoserecurring uranium stocks.These metallogenic considerations at various scales requires anexhaustive analysis of sedimentological units processions low levelof different sequences to locate fairly objectively uraniummineralized sandstone bodies.
  43. 43. PERSPECTIVE OF URANIUM EXPLORATIONTwo types of uranium concentrations are investigated in the TinSéririne basin: Uranium concentrations related to the precambrian (Upper Proterorozoic) basement- paleozoic cover unconformity. Uraniferous concentrations related to continental sandstone.Based on these results, the ANOU IZELEG formation of LowerDevonian (External Tassili), represent a preferential target forthe future exploration program.
  44. 44. SEDIMENTOLOGICAL AND METALLOGENIC CHARACTERS OF ANOU IZELEG FORMATION (LOWER DEVONIAN) Fluvio-deltaic formation with channel sedimentation and abundance of organic matter; Secondary uranium mineralization expressed and represented by the torbernite and autunite; Occurence of alkaline volcanic materials in this formation (Efei Mazerta); Formation characterized by a redox front arranged parallel with In Azaoua-Arlit fault flexure; Flexible and local tectonic deformation along the two accidents of In Azaoua and In Guezzam reflecting the Hercynian event in Tin Séririne region.THESE CHARACTERS ARE SIMILAR TO THE GEOLOGICAL ENVIRONMENTOF ARLIT AND AKOUTA URANIUM DEPOSITS OF TIM MERSOI BASIN INNIGER.
  45. 45. ANOU IZELEG FORMATION AREA TARGETED FOR URANIUM SANDSTONE EXPLORATION IN TIN SERIRINE BASIN(OUA NAHAGGAR Tassili - South-East Hoggar)
  46. 46. URANIUM OCCURRENCES OF TIN SERIRINE BASIN IN PALEOZOIC AND GONDWANA SEQUENCESIn order to input these uranium occurrences in ageneral framework, a reference to the P. Molina(1988) PALEOZOIC AND GONDWANA SEQUENCESSYNTHESIS is proposed.
  47. 47. TILLITE MARINE SEDIMENTS URANIUM DEPOSITS/OCCURRENCES IN TIM MERSOI BASIN- NIGER CONTINENTAL – CLASTIC SEDIMENTS 53 – MADAOUELA; 54 – ARLIT; 55 – N’TASSA; 56 – AKOUTA; 57 – EBALA; 58 – IMOURAREN. BASIC VOLCANICSUNDATED ACID VOLCANICS CORRELATION OF URANIUM GEOLOGY BETWEENUNDATED GRANITES SOUTH AMERICA AND AFRICAUNDATED JURASSIC MAP 2 PERMO-TRIASSIC PALEOZOIC AND GONDWANA SEQUENCES 1:10 000 000 In P. MOLINA, 1988. CARBONIFEROUS LOWER PALEOZOIC
  48. 48. SOUTH AMERICA AFRICA QUATERNAIRE No Deposit    Calcrètes Namaqoualand POST-  Marine Phosphates  Marine Phosphates - SENEGAL, ANGOLA (Cabinda),- CONGO EOCENE GONDWANA ARGENTINA - BRAZIL  Not-marine Phosphates CENTRAL AFRICAN REPUBLIC (Bakoume) SEQUENCES CRETACEOUS  ARGENTINA  NIGER  JURASSIQUE JURASSIC  throught the stratigraphic column but mostly PERMIAN - NIGER Imouraren  throught the stratigraphic column GONDWANA SEQUENCES -ARGENTINA (Sierra Pintada)  CARBONFERE but mostly PERMIAN(SOUTH AFRICA) LOWER - NIGER Arlit, Tassa, Akouta, Ebala - BRAZIL (Figueira)  Madaouela CARBONIFEROUS  et  surtout dans le LOWER PALEOZOIC No known deposits DEVONIEN  and  in Brazilian mobile  in Pan-African mobile chains chains -NAMIBIA post-tectonic Damarian Alaskites (Rossing), UPPER PROTERZOIC - BRAZIL -CONGO Metasomatic deposits: Katangian hydrothermal deposits Itataia ,Lagoa Real,Espinharas  in Central Afric mobile chainse (CAMEROUN, TCHAD) MIDDLE PROTERZOIC No known deposits  TOGO LOWER PROTERZOIC  BRAZIL Auriferous conglomerates  GABON (sandstone-type) FRANCEVILLIEN - Quadrilatero ferriféro  SOUTH AFRICA (Auriferous conglomerates) Witwaterstrand ARCHEAN No known deposits  Hightly major deposits  Major deposits (lower than 5000 tU)  Small or Medium deposits (500 - 5000 tU)  Significant occurrence or very small deposits (lower than 500 tU) .SPATIAL LOCATION, IN GEOLOGICAL TIME, URANIUM DEPOSITS OF SOUTH AMERICA AND AFRICA - P. MOLINA, 1988 -
  49. 49. 59 60 62 61 TILLITE MARINE SEDIMENTS URANIUM DEPOSITS/OCCURRENCES IN TIM MERSOI BASIN- NIGER CONTINENTAL – CLASTIC SEDIMENTS 53 – MADAOUELA ; 54 – ARLIT ; 55 – N’TASSA ; 56 – AKOUTA ; 57 – EBALA ; 58 – IMOURAREN. BASIC VOLCANICS URANIUM DEPOSITS/OCCURRENCES IN TIN SERIRINE BASIN- ALGERIAUNDATED ACID VOLCANICSUNDATED 62 – TAHAGGART ; 60 –TIMOUZELINE ; 61 – TAMART N’IBLIS ; 62 – TAMEDJAOUT. GRANITES CORRELATION OF URANIUM GEOLOGYUNDATED BETWEEN SOUTH AMERICA AND AFRICA JURASSIC PERMO-TRIASSIC MAP 2 CARBONIFEROUS PALEOZOIC AND GONDWANA SEQUENCES 1:10 000 000 In P. MOLINA, 1988. LOWER PALEOZOIC
  50. 50. SOUTH AMERICA AFRICA QUATERNAIRE No Deposit    Calcrètes Namaqoualand POST-  Marine Phosphates  Marine Phosphates - SENEGAL, ANGOLA (Cabinda),- CONGO EOCENE GONDWANA ARGENTINA - BRAZIL  Not-marine Phosphates CENTRAL AFRICAN REPUBLIC (Bakoume) SEQUENCES CRETACEOUS  ARGENTINA  NIGER  JURASSIQUE JURASSIC  throught the stratigraphic column but mostly PERMIAN - NIGER Imouraren  throught the stratigraphic column GONDWANA SEQUENCES -ARGENTINA (Sierra Pintada)  CARBONFERE but mostly PERMIAN(SOUTH AFRICA) LOWER - NIGER Arlit, Tassa, Akouta, Ebala - BRAZIL (Figueira)  Madaouela CARBONIFEROUS  et  surtout dans le ALGERIA  Tahaggart LOWER PALEOZOIC DEVONIEN  Timouzeline, Tamarat nIblis  and  in Brazilian mobile  in Pan-African mobile chains chains -NAMIBIA post-tectonic Damarian Alaskites (Rossing), UPPER PROTERZOIC - BRAZIL -CONGO Metasomatic deposits: Katangian hydrothermal deposits Itataia ,Lagoa Real,Espinharas  in Central Afric mobile chainse (CAMEROUN, TCHAD) MIDDLE PROTERZOIC No known deposits  TOGO LOWER PROTERZOIC  BRAZIL Auriferous conglomerates  GABON (sandstone-type) FRANCEVILLIEN - Quadrilatero ferriféro  SOUTH AFRICA (Auriferous conglomerates) Witwaterstrand ARCHEAN No known deposits  Hightly major deposits  Major deposits (lower than 5000 tU)  Small or Medium deposits (500 - 5000 tU)  Significant occurrence or very small deposits (lower than 500 tU) .SPATIAL LOCATION, IN GEOLOGICAL TIME, URANIUM DEPOSITS OF SOUTH AMERICA AND AFRICA REVISED - P. MOLINA, 1988 -
  51. 51. INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)Technical Meeting on origin of sandstone uranium deposits : A global perspective

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