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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
We are pleased to present you today the results of the
uranium prospection in the Tin Seririne basin in the
meridional margin of the Hoggar.

This results are included in a sedimentological fit to try to
elucidate the uraniferous highlighted occurrence
distribution in order to contribute to develop an
exploration program framework in this region.
 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
Geographical situation
of Tin Séririne sedimentary basin
(Tassil Oua N'Ahaggar, Sud-Est du Hoggar)
Concerning    geology, the Tin Seririne sedimentary basin
belongs to the Oua n’Ahaggar Tassili wich represents the
PALEOZOIC COVER of the southern edge of the central Hoggar.
It is constituting the EXTEND to the north of the TIM MERSOI
sedimentary basin (Niger) known for its uranium potential.
Geological context of Tin Séririne sedimentary basin
           (Tassil Oua N'Ahaggar, South-East of Hoggar)
The regional geological study of this southern part of the
saharian platform has identified three main geological
elements wich have conditionned the geological history of
this 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.
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 volcanism
21°
                                       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
For uranium prospection in Tin Séririne region, all
geological and geophysical technics and methods
have been implemented:


 Geological survey.

 Geophysical survey.

 Airborne Geophysical survey.
Deposits

Uranium Mineralization




  GEOLOGICAL MAP
         OF
 TIN SERIRINE BASIN
Confirmed
radiometric anamoly

                          TAHAGGART




                      RADIOMETRIC MAP OF ASSEO AREA
                             - AEROGEOPHYSICAL SURVEY -
SEROUENOUT
  TERRANE
                         MOLE
                          OF
                       ISSALANE




         7°30’ FAULT
MAGNETIC MAP OF ASSEO AREA
   - AEROGEOPHYSICAL SURVEY -
In Azzaoua – Arlit Fault
       Deforming
the ordovician sandstones
W                                                                               E


                                        Thrust plane




                                                                   Ordovician
    Precambrian basement                                          sandstones




Overthrust of the precambrian basement on the paleozoic cover underlining the
                     hercynian event in Tin Séririne region
URANIUM EXPLORATION RESULTS
          IN TIN SERIRINE BASIN


Three uranium    mineralized   horizons   have   been
identified :


 Precambrian basement – Paleozoic cover interface;

 Base of lower Devonian ;

 Base of lower Visean.
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 RESULTS
OF THE URANIUM EXPLORATION
             IN
     TIN SERIRINE BASIN
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 ».
Ordovician sandstones: The internal Tassili
           « Tahaggart region »
Ordovician sandstone




                                        Basal conglomerate




                                          Ferrugination




               Altered gneiss



THE URANIUM MINERALIZATION IN THE BASEMENT-COVER INTERFACE
                     - Type Tahaggart -
Distribution of uranium mineralization
   in the basement-cover interface
Distribution of uranium mineralization in the basement-cover interface
In   the     unconformity-related   mineralization
type, the regolith shows a significant weathering
of the rock where kaolinization and ferrugination
are dominating.

The mineralization is dominated by phosphatic and
vanadiferous uranium minerals such as:

 Autunite , Yellow mineral.
 Torbernite , Green mineral.
 Carnotite , Yellow mineral.
FERRUGINATION




                KAOLINIZATION
FERRUGINATION
MINERALIZED BASAL CONGLOMERATE OF ORDOVICIAN
ALTERED AND MINERALIZED RHYOLITE
           (REGOLITH)
URANIUM MINERALIZATION IN PLACE
          (REGOLITH)
Sandstones of lower Devonian : External Tassili
            « Timouzeline region »
Basal sandstone formation of lower Devonian : External Tassili
          (I Meskour formation -Timouzeline region)
Efei mazerta formation of lower Devonian : External Tassili
                    (In Azzaoua region)
Feldspathic sandstone formation of Timouzeline : External Tassili
              (Lower Devonian – Timouzeline region)
Feldspathic sandstone formation of Timouzeline : External Tassili
              (Lower Devonian – Timouzeline region)
The three identified regional horizons bearing uranium
occurrences (Cambrian-Ordovician, lower Devonian and
lower Visean) in the Tin Seririne basin, allowed us to
identify, broadening to the uranium occurrences and
deposits 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).
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 HORIZONS
BEARING URANIUM OCCURRENCES
              IN
      TIN SERIRINE BASIN
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. Trias
21°
                                       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)
PALEOZOIC SEQUENCES AND STRATIGRAPHY




We have included all results in a sedimentological
approach   to   try   to   elucidate   the   highlighted
uranium occurrence distribution in this region.
LITHOSTRATIGRAPHIC COLUMN
                OF
       TIN SERIRINE REGION
(OUA N'AHAGGAR Tassili - South-East Hoggar)
SEQUENCE ANALYSIS
                 OF
        PALEOZOIQUES SERIES
                 OF
        TIN SERIRINE REGION

(OUA N'AHAGGAR Tassili - South-East Hoggar)
Khaldi A.
                                                    Plate-forme saharienne (Sud du Hoggar)
                                                    Fekirine et Abdallah (1998)
                                                    Plate-forme saharienne (Nord du Hoggar)
        PALEOZOIC SERIES CORRELATION BETWEEN
NORTHERN AND SOUTHERN MARGINS OF THE SAHARAN PLATFORM
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)
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
CONCLUSION, the uranium concentrations encased in Paleozoic
sedimentary series are located systematically in the coarse
sandstone formations corresponding to low-level suite (Lowstand
wedge System Tract.) in close relationship with Ordovician base
unconformity sequences (Tahaggart), Devonian (Tamart-N-Iblis -
Timouzeline) and Carboniferous (Arlit - Arlette - Akouta -
Madaouela). The existence of significant secondary uranium
minerals concentrations, as phosphates and vanadates of
uranium, shows that these deposits have undergone late
remobilization.

The genesis of these mineral concentrations is very tightly
controlled by three main regional factors: Sedimentology (coarse
sandstones) and tectonics (In Azzaoua-Arlit lineament), the redox
phenomena (geochemical zonation) and acid volcanism (Aïr
anorogenic province) presented as the primary source of those
recurring uranium stocks.

These metallogenic considerations at various scales requires an
exhaustive analysis of sedimentological units processions low level
of different sequences to locate fairly objectively uranium
mineralized sandstone bodies.
PERSPECTIVE OF URANIUM EXPLORATION


Two types of uranium concentrations are investigated in the Tin
Séririne 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 Lower
Devonian (External Tassili), represent a preferential target for
the future exploration program.
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 ENVIRONMENT
OF ARLIT AND AKOUTA URANIUM DEPOSITS OF TIM MERSOI BASIN IN
NIGER.
ANOU IZELEG FORMATION
            AREA TARGETED
        FOR URANIUM SANDSTONE
             EXPLORATION
                  IN
          TIN SERIRINE BASIN
(OUA N'AHAGGAR Tassili - South-East Hoggar)
URANIUM OCCURRENCES
                   OF
           TIN SERIRINE BASIN
                   IN
   PALEOZOIC AND GONDWANA SEQUENCES


In order to input these uranium occurrences in a
general framework, a reference to the P. Molina
(1988) PALEOZOIC AND GONDWANA SEQUENCES
SYNTHESIS is proposed.
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
UNDATED


 ACID VOLCANICS                                     CORRELATION OF URANIUM GEOLOGY
                                                               BETWEEN
UNDATED



 GRANITES                                              SOUTH AMERICA AND AFRICA
UNDATED



 JURASSIC                                               MAP 2
 PERMO-TRIASSIC                          PALEOZOIC AND GONDWANA SEQUENCES
                                                                      1:10 000 000
                                                                 In P. MOLINA, 1988.
 CARBONIFEROUS

 LOWER PALEOZOIC
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 -
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- ALGERIA
UNDATED


 ACID VOLCANICS
UNDATED
                                   62 – TAHAGGART ; 60 –TIMOUZELINE ; 61 – TAMART N’IBLIS ; 62 – TAMEDJAOUT.


 GRANITES
                                                      CORRELATION OF URANIUM GEOLOGY
UNDATED
                                                                 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
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 n'Iblis


                                         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 -
INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
Technical Meeting on origin of sandstone uranium deposits :
                   A global perspective

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07 algeria sandstone aiea

  • 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. We are pleased to present you today the results of the uranium prospection in the Tin Seririne basin in the meridional margin of the Hoggar. This results are included in a sedimentological fit to try to elucidate the uraniferous highlighted occurrence distribution in order to contribute to develop an exploration program framework in this region.
  • 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. Geographical situation of Tin Séririne sedimentary basin (Tassil Oua N'Ahaggar, Sud-Est du Hoggar)
  • 5. Concerning geology, the Tin Seririne sedimentary basin belongs to the Oua n’Ahaggar Tassili wich represents the PALEOZOIC COVER of the southern edge of the central Hoggar. It is constituting the EXTEND to the north of the TIM MERSOI sedimentary basin (Niger) known for its uranium potential.
  • 6. Geological context of Tin Séririne sedimentary basin (Tassil Oua N'Ahaggar, South-East of Hoggar)
  • 7. The regional geological study of this southern part of the saharian platform has identified three main geological elements wich have conditionned the geological history of this 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. 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 volcanism 21° 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. For uranium prospection in Tin Séririne region, all geological and geophysical technics and methods have been implemented:  Geological survey.  Geophysical survey.  Airborne Geophysical survey.
  • 10. Deposits Uranium Mineralization GEOLOGICAL MAP OF TIN SERIRINE BASIN
  • 11. Confirmed radiometric anamoly TAHAGGART RADIOMETRIC MAP OF ASSEO AREA - AEROGEOPHYSICAL SURVEY -
  • 12. SEROUENOUT TERRANE MOLE OF ISSALANE 7°30’ FAULT MAGNETIC MAP OF ASSEO AREA - AEROGEOPHYSICAL SURVEY -
  • 13. In Azzaoua – Arlit Fault Deforming the ordovician sandstones
  • 14. W E Thrust plane Ordovician Precambrian basement sandstones Overthrust of the precambrian basement on the paleozoic cover underlining the hercynian event in Tin Séririne region
  • 15. URANIUM EXPLORATION RESULTS IN TIN SERIRINE BASIN Three uranium mineralized horizons have been identified :  Precambrian basement – Paleozoic cover interface;  Base of lower Devonian ;  Base of lower Visean.
  • 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 RESULTS OF THE URANIUM EXPLORATION IN TIN SERIRINE BASIN
  • 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. Ordovician sandstones: The internal Tassili « Tahaggart region »
  • 19. Ordovician sandstone Basal conglomerate Ferrugination Altered gneiss THE URANIUM MINERALIZATION IN THE BASEMENT-COVER INTERFACE - Type Tahaggart -
  • 20. Distribution of uranium mineralization in the basement-cover interface
  • 21. Distribution of uranium mineralization in the basement-cover interface
  • 22. In the unconformity-related mineralization type, the regolith shows a significant weathering of the rock where kaolinization and ferrugination are dominating. The mineralization is dominated by phosphatic and vanadiferous uranium minerals such as:  Autunite , Yellow mineral.  Torbernite , Green mineral.  Carnotite , Yellow mineral.
  • 23. FERRUGINATION KAOLINIZATION
  • 26. ALTERED AND MINERALIZED RHYOLITE (REGOLITH)
  • 27. URANIUM MINERALIZATION IN PLACE (REGOLITH)
  • 28. Sandstones of lower Devonian : External Tassili « Timouzeline region »
  • 29. Basal sandstone formation of lower Devonian : External Tassili (I Meskour formation -Timouzeline region)
  • 30. Efei mazerta formation of lower Devonian : External Tassili (In Azzaoua region)
  • 31. Feldspathic sandstone formation of Timouzeline : External Tassili (Lower Devonian – Timouzeline region)
  • 32. Feldspathic sandstone formation of Timouzeline : External Tassili (Lower Devonian – Timouzeline region)
  • 33. The three identified regional horizons bearing uranium occurrences (Cambrian-Ordovician, lower Devonian and lower Visean) in the Tin Seririne basin, allowed us to identify, broadening to the uranium occurrences and deposits 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. 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 HORIZONS BEARING URANIUM OCCURRENCES IN TIN SERIRINE BASIN
  • 35. 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. Trias 21° 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. PALEOZOIC SEQUENCES AND STRATIGRAPHY We have included all results in a sedimentological approach to try to elucidate the highlighted uranium occurrence distribution in this region.
  • 37. LITHOSTRATIGRAPHIC COLUMN OF TIN SERIRINE REGION (OUA N'AHAGGAR Tassili - South-East Hoggar)
  • 38. SEQUENCE ANALYSIS OF PALEOZOIQUES SERIES OF TIN SERIRINE REGION (OUA N'AHAGGAR Tassili - South-East Hoggar)
  • 39. Khaldi A. Plate-forme saharienne (Sud du Hoggar) Fekirine et Abdallah (1998) Plate-forme saharienne (Nord du Hoggar) PALEOZOIC SERIES CORRELATION BETWEEN NORTHERN AND SOUTHERN MARGINS OF THE SAHARAN PLATFORM
  • 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. 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. CONCLUSION, the uranium concentrations encased in Paleozoic sedimentary series are located systematically in the coarse sandstone formations corresponding to low-level suite (Lowstand wedge System Tract.) in close relationship with Ordovician base unconformity sequences (Tahaggart), Devonian (Tamart-N-Iblis - Timouzeline) and Carboniferous (Arlit - Arlette - Akouta - Madaouela). The existence of significant secondary uranium minerals concentrations, as phosphates and vanadates of uranium, shows that these deposits have undergone late remobilization. The genesis of these mineral concentrations is very tightly controlled by three main regional factors: Sedimentology (coarse sandstones) and tectonics (In Azzaoua-Arlit lineament), the redox phenomena (geochemical zonation) and acid volcanism (Aïr anorogenic province) presented as the primary source of those recurring uranium stocks. These metallogenic considerations at various scales requires an exhaustive analysis of sedimentological units processions low level of different sequences to locate fairly objectively uranium mineralized sandstone bodies.
  • 43. PERSPECTIVE OF URANIUM EXPLORATION Two types of uranium concentrations are investigated in the Tin Séririne 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 Lower Devonian (External Tassili), represent a preferential target for the future exploration program.
  • 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 ENVIRONMENT OF ARLIT AND AKOUTA URANIUM DEPOSITS OF TIM MERSOI BASIN IN NIGER.
  • 45. ANOU IZELEG FORMATION AREA TARGETED FOR URANIUM SANDSTONE EXPLORATION IN TIN SERIRINE BASIN (OUA N'AHAGGAR Tassili - South-East Hoggar)
  • 46. URANIUM OCCURRENCES OF TIN SERIRINE BASIN IN PALEOZOIC AND GONDWANA SEQUENCES In order to input these uranium occurrences in a general framework, a reference to the P. Molina (1988) PALEOZOIC AND GONDWANA SEQUENCES SYNTHESIS is proposed.
  • 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 VOLCANICS UNDATED ACID VOLCANICS CORRELATION OF URANIUM GEOLOGY BETWEEN UNDATED GRANITES SOUTH AMERICA AND AFRICA UNDATED JURASSIC MAP 2 PERMO-TRIASSIC PALEOZOIC AND GONDWANA SEQUENCES 1:10 000 000 In P. MOLINA, 1988. CARBONIFEROUS LOWER PALEOZOIC
  • 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. 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- ALGERIA UNDATED ACID VOLCANICS UNDATED 62 – TAHAGGART ; 60 –TIMOUZELINE ; 61 – TAMART N’IBLIS ; 62 – TAMEDJAOUT. GRANITES CORRELATION OF URANIUM GEOLOGY UNDATED 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. 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 n'Iblis  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. INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA) Technical Meeting on origin of sandstone uranium deposits : A global perspective