RÉPUBLIQUE ISLAMIQUE DE MAURITANIE

AGE (Ma) Qa Alluvial fans, cones, and talus, undifferentiated U.S. Department of the Interior EXPLANATION OF STRUCTURAL COMPONENTS EXPLANATION OF OTHER SYMBOLS Ministère du Pétrole, de l’Energie et des Mines Faults, shear zones Dikes and veins Dunite breccia pipe Qca Calcrete and silcrete (hamada) U.S. Geological Survey Open-File Report 2013–1280 Fault, sense of displacement unknown or not specified Carbonatite dike (Mesozoic) Qd Dunes and sand cover National boundary Chapter A1

Y Compiled by Dwight C. Bradley, Holly Motts, John D. Horton, Stuart Giles, and Cliff D. Taylor Deliverable 51c R Qf Fluvial deposits, alluvium Fault, sense of displacement unknown or not specified Postbirimian dike (predominantly Mesozoic) A (hidden or inferred) Railroad N 2015 R Ql Lacustrine deposits Thrust fault (teeth on hanging wall) Neobirimian dike (Paleoproterozoic) E Major cities

T

A Qm Marine and marginal marine deposits Bradley, D.C., Motts, H.A., Horton, J.D., Giles, Stuart, and Taylor, C.D., 2015, Geologic U map of (phase V, deliverables 51a, 51b, and 51c), chap. A1 of Taylor, C.D., ed., Thrust fault (teeth on hanging wall) (hidden or inferred) Anorthosite dike Q Qn Sand over desert pavement and calcrete Roado - major C Second projet de renforcement institutionnel du secteur minier de la République I Islamique de Mauritanie (PRISM-II): U.S. Geological Survey Open-File Report Dike or inferred dike of unspecified type Left-lateral strike-slip fault EXPLANATION OF GEOLOGIC UNITS

O Qr Desert pavement gravel (reg) 2013–1280-A1, 3 pl., http://dx.doi.org/10.3133/ofr20131280. [In English and French.] Road - minor

Z Qs Inactive sebkha- gypsum, gypsum dunes Explanation for the Geologic Map of Mauritania Quartz vein (shown as polygon if large) Right-lateral strike-slip fault

O 2.6

N Analcimite Can Normal fault (bars on hanging wall) Ferruginous quartzite marker bed E Cca Chalky limestone with local basal conglomerate Intrusive rock units are

C Shear zone (shown as polygon if larger) Cld Detrital laterite, ferricrete represented by red outlines

Y Shear zone (hidden or inferred) R TlM Mbidane Formation (Continental Terminal)

A

I

T Bababé Group

R ARCHEAN ROCKS CENOZOIC ROCKS AND SEDIMENTS Atar Group Ijibbitene Group E Bar Rinndiao Formation T Foum Chor, Ksar Torchane, and Tod Formations, Ed Dab'a Formation—Calcite+chlorite schist, sericite schist, Rgueïbat Shield—Intrusive Rocks Qa Alluvial fans, cones, and talus, undifferentiated (Quaternary) Ib Bab Bofal Formation At1 undifferentiated —Sandstone, variably quartz-rich and locally banded iron formation, quartzite, conglomerate, and limestone pebbly, overlain by gray shale, silstone, and minor dolomitic lime- (Neoproterozoic) Pyroxenite, metapyroxenite and metaperidotite (Neoarchean/ Bofal and Gorgol Px Bag Qca Calcrete and silcrete (hamada) (Quaternary) stone (Mesoproterozoic ) El Freidi Formation —Metabasite, calcite+chlorite schist, chloritic Paleoproterozoic to Neoproterozoic) Formations, undivided TAOUDENI BASIN TINDOUF BASIN MAURI TANIDE OROGEN RGUEÏBAT SHIELD Ibm Aouinet Ould Bou Derballe, Aouleigate, Tarioufet, Terrarit, metatuff (Neoproterozoic) Quartz+feldspar+mica±garnet±tourmaline±beryl pegmatite Apg Qd Dunes and sand cover (Quaternary) Tifounke, Touiderguilt, and Formations, undifferentiated (Archean) At2 Gàoua Formation —Sericite±hematite quartzite, locally conglo- —Dolostone and dolomitic limestone including stromatolitic, micro- Go HANK - meratic, and muscovite±garnet±chloritoid schist (Neoproterozoic) AFOLL É / HODH TAGANT ADRAR HANK ZEMMOUR NORTH-YETTI NORTH-WEST NORTH CENTRAL-NORTH CENTRAL-SOUTH SOUTH-EXTREME SOUTH-WEST CENTRAL NORTH NORTH-EAST Qf Fluvial deposits, alluvium (Quaternary) crystalline, macrocrystalline, ferruginous, and carbonate- Pan Anorthosite (Archean) CHEGGA MA conglomerate facies; minor sandstone, shale, and glauconitic shale 65.5 El Harach Group (Tâjâit Mbeïdiat Formation) 65.5 (Mesoproterozoic) Hr —Pelitic schist and Super-Group Ql Lacustrine deposits (Quaternary) phyllite, quartzite; minor mafic and felsic schists (Neoproterozoic) ADu Dunite-carbonate breccia (Neoarchean) Néma Group Continental infill Aïdiate Formation Aïdiate Formation Intrusive rock units are represented by red symbols Intrusive rock units are represented by red symbols Char Group (Agueni and Azougui Formations, undifferentiated Ch —Lower part: cross-bedded sandstone with subordinate conglo- Aï Aï Qm Marine and marginal marine deposits (Quaternary) C CRETACEOUS Nm Ci AG Gabbro (Neoarchean)

I merate and mudstone; upper part: red mudstone, siltstone, sandstone El Hneikat Formation —Mafic schist, quartz+muscovite schist, and dolostone (Mesoproterozoic) Eh 145.5 145.5 quartzite, calc-schist, and carbonate facies banded iron formation O Qn Sand over desert pavement and calcrete (Quaternary) (Paleoproterozoic to Neoproterozoic) Douik Group —Conglomeratic sandstone interbedded with pelitic CN Metagranite (Neoarchean) Z Do carbonates (Mesoproterozoic) Qr Desert pavement gravel (reg) (Quaternary)

O El Mreïti Group l’Oued Dibilal Complex Pub Ultramafic rocks (Neoarchean) Gabbro, diorite, Granophyric S Gabbro, diorite, Granophyric Gabbro, diorite, Gabbro, diorite, Gabbro, diorite, Gabbro, diorite, JURASSIC Gabbro, diorite, Qs Inactive sebkha: gypsum, gypsum dunes (Quaternary) Aguelt el Mabha Formation —Organic-rich pelite with lenses of l'Oued Erbeyib Formation—Light green quartzite dolerite, and hornblende dolerite, and dolerite, and dolerite, and dolerite, and hornblende dolerite, and ODe E dolerite, and microgabbro microgranite Em intraformational carbonate breccia and fine-grained, hummocky (Paleoproterozoic to Neoproterozoic) sy Sodalite syenite (Neoarchean) microgabbro microgranite microgabbro microgabbro microgabbro microgabbro microgabbro Can Analcimite (Tertiary) cross-stratified sandstone (Mesoproterozoic) M Md Mg Undifferentiated gneiss and granofels, locally charnockitic and 201 Md Mg Md Md Md Md Md 200 Sub-group 1, and En Nesoar, Gouamîr, Khatt, Tenoumer, and ODg leucocratic, partly mylonitic (Paleoproterozoic to Neoproterozoic) Tiris Complex TRIASSIC & PERMIAN Cca Chalky limestone with local basal conglomerate (Tertiary) Touirist Formations, undifferentiated—Basal sandstone, Dahr Super-Group Hodh Super-Group Em1 Quartz+feldspar gneiss, marble, amphibolite, metapyroxenite 299 Kandou Formation 299 pelite, laminated dolostone, stromatolite biostromes Trla El Guettara Group Ouarkziz Group Tiferchaï Formation—Basalt and olivine gabbro (Neoarchean) CARBONIFEROUS (Mesoproterozoic, 1106±10) ODt Ou Kd Cld Detrital laterite, ferricrete (Tertiary) (Paleoproterozoic to Neoproterozoic) Eg Sub-group 2—Glauconitic sandstone, pelite, carbonate breccia, Quartz+feldspar gneiss, charnockitic gneiss, sillimanite+ Em2 359 359 Trle cordierite+garnet gneiss, and migmatite (Neoarchean) Dahr Super-Group Dahr Super-Group Mbidane Formation (Continental Terminal) —Sandstone and stromatolitic dolostone (Mesoproterozoic) TlM clayey sand, kaolinitic clay, iron pan (Upper Tertiary) Mirikli Formation—Granite, granite and monzonite, and Dahr Super-Group Tenemouj Dahr Super-Group Dahr Super-Group Zemmour Group Zemmour Group El Thlethyate Group —Stromatolitic dolostone interbedded with PROTEROZOIC ROCKS Trm screens of aluminous parageniss and banded iron formation Tenemouj Group Group Tenemouj Group In Dagouber Group Zm3 Zm3 Godiovol Formation Et Bababé Group dolomitic sandstone and minor quartzite (Mesoproterozoic) Rgueïbat Shield—Intrusive Rocks (Neoarchean, 2654±8) Tm Tm Tm Id Gd DEVONIAN Zm2 Zm2 Rinndiao Formation —Argillaceous sandstone, yellow siltstone Zemzem Metagranite—metamicrogranodiorite, and hornblende± Bar Souroukoto Group (El Gleïta, Maoudass, Rhaïfara, and Téguel ZZ and mudstone; locally fossiliferous or glauconitic (Upper Tertiary) So Ouézé Formations, undifferentiated) —Fine- to medium-grained biotite metagranite (Neoarchean, 2683±22) Zm1 Zm1 Bir Moghreïn Suite TmOg feldspathic, micaceous, and glauconitic sandstone-quartzite Bofal Formation—Dolomitic limestone, argillaceous sandstone, (Mesoproterozoic) Bab BMa Biotite alkali granite (Paleoproterozoic) Iguilid Suite 416 416 mudstone, phosphorite, and fine sandstone (Middle Tertiary) PROTEROZOIC ROCKS Dahr Super-Group Dahr Super-Group Dahr Super-Group l’Oued Chig Dahr Super-Group Dahr Super-Group Dahr Super-Group Dahr Super-Group IG Metagabbro (Neoarchean, 2706±54) C l’Oued Chig Group Gara Bouya Ali Group Gara Bouya Ali Group —Ferruginous Mauritanide Orogen—Intrusive Rocks I Group l’Oued Chig Group Toba El Hamar Group Çangarafa Group Çangaraga Group Bofal and Gorgol Formations, undivided Dahr Super-Group Bag Biotite granite (Paleoproterozoic)

Groups, undivided BMb SILURIAN sandstone, argillaceous sandstone, claystone, mudstone, and Og Og Og Th Gb Gb Cn Pgmy Mylonitized granite and granitic augen gneiss (Neoproterozoic) Ioulgend granite—pegmatitic tourmaline-garnet-biotite O Cn dolomitic limestone (Middle Tertiary) IGo Tenemouj and l’Oued Chig Tenemouj granite (Neoarchean) Z BMg Granite (Paleoproterozoic) 444 444 MESOZOIC ROCKS Ppqm Quartz+muscovite±tourmaline pegmatite (Neoproterozoic) Touijenjert Suite O Dahr Super-Group Dahr Super-Group Dahr Super-Group Dahr Super-Group Dahr Super-Group Dahr Super-Group Dahr Super-Group Group Tichit Group Tichit Group Tichit Group Garat El Hamoueïd Group Garat El Hamoueïd Group Touyerma granite—Biotite granite and granite with mafic xenoliths E Tichit Group Oua-Oua Group Aïdiate Formation —Arkosic conglomerate, cross-stratified Inchiri Complex BMs Sodic amphibole granite (Paleoproterozoic) TJg Ti Ti Ti Ti Gh Gh Aï (Neoarchean, 2726±7) L sandstone, and chert with sponge spicules (Cretaceous) Ti Oo Metagranite, feldspar+quartz megacrystic granite with garnet and Tigsmat el Akhdar alkaline Suite HDg A ORDOVICIAN Continental infill —Quartz-rich sandstone with fossilized wood cordierite, protomylonitic; leucocratic granitic orthogneiss, locally TJp Touijenjert granite—Porphyritic monzogranite (Neoarchean) Ci migmatized and (or) mylonitized (Neoproterozoic, 599±8) TA Aegyrine granite (Paleoproterozoic) P (Cretaceous) Adrar Super-Group Adrar Super-Group l’Erg Chech Group Oumat El Ham Group HDt Metatonalite (Neoproterozoic) Adrar Super-Group Adrar Super-Group Adrar Super-Group Adrar Super-Group Adrar Super-Group Oulata Super-Group TAg Granite (Paleoproterozoic) Ahmeyim Grand Dike—Layered gabbronorite, leucogabbro, Ec Oh Oujeft Group AY Oujeft Group Oujeft Group Oujeft Group Tamkarkart Formation Néma Group (Adeïlé, Brazer, Saïlé, and Zemraguié Formations, and gabbrodiorite (Neoarchean, 2733± 4 Ma) 488 Oj Oj Oj Tk Oj 488 Nm undifferentiated) —Multicolored mudstone, green siltstone, and TAp Phonolite (Paleoproterozoic) Sélibabi Suite —Muscovite leucogranite (Neoproterozoic, 639±7) fine-grained, cross-stratified sandstone (Cretaceous) SB Amsaga Complex NoOj Adrar Super-Group Adrar Super-Group Adrar Super-Group Adrar Super-Group Adrar Super-Group Syenite, aegyrinic augite syenite, nepheline syenite Quartzofeldspathic gneiss (leptynite), with amphibole, biotite, garnet, Adrar Super-Group Adrar Super-Group TAs Aml Nouatil Group Nouatil Group Kreb-En-Naga Group Nouatil Group Nouatil Group Md Gabbro, diorite, dolerite, and microgabbro (Jurassic) Selibabi (?) Suite —Foliated, coarse biotite+muscovite granite and (Paleoproterozoic) Nouatil Group undivided Nouatil Group Plg or garnet+sillimanite (Neoarchean, 2716±5) CAMBRIAN metagranite (Neoproterozoic, 637±5) No No No Kn No No No Yetti Suite Adrar Super-Group Mg Granophyric hornblende microgranite (Jurassic, 200±4) AMc Charnockitic gneiss (Mesoarchean) Soueïdiyat Suite Yc Cordierite granite (Paleoproterozoic) Oujeft and Nouatil Groups, JbTeNo SDa Garnet amphibolite (Neoproterozoic) PALEOZOIC ROCKS Yg Granite (Paleoproterozoic, 2002±12, 1995±20) AMg Tonalitic orthogneiss (Mesoarchean) 542 Pegmatite Tsalabia el Khadra 542.0 Inchiri Complex Oumachoueima Complex (Part Adrar Super- Group Ppqm Kd Kandou Formation —Polymict conglomerate (Carboniferous) SDb Biotite granodiorite (Neoproterozoic) Hajar Dekhen- Neoproterozoic) Yl Biotite-muscovite granite (Paleoproterozoic) Group Agb Metagabbro (Mesoarchean) Kleouat Group Ocf Mbout Super-Group Mbout Super-Group Adrar Super-Group Adrar Super-Group Téniagouri Adrar Super-Group Adrar Super-Group KHq Godiovol Formation—Feldspathic sandstone; fossiliferous Gabbro and Microgabbro El Fadra Group El Fadra Group Gd Garnet+hornblende metatonalite to metadiorite Téniagouri Group Téniagouri Group Group l’Azlaf Group l’Azlaf Group microconglomerate (Lower Devonian) SDm HDg Ocj Adrar Super-Group Adrar Super-Group (Neoproterozoic, 643±6) Pgm Fr Fr Sfariat Suite —Granodiorite and granite, common aplite dikes Art Arhdéjit leucotonalite (Mesoarchean, 2909±20) Te Te Te Az Az Téniagouri Group Téniagouri Group SF HDt Ocs Tarf Magneïna Sub-suite —Eclogite, amphibolite (Neoproterozoic) (Paleoproterozoic, 2023±3) Mbout Super-Group Mbout Super-Group Dahr Super-Group SDt JbTe JbTe Te Te Tamagot orthogneiss —Garnet+amphibole granitic gneiss El Ghabra Group El Ghabra Group Adrar Super-Group Adrar Super-Group Adrar Super-Group HDg Oci El Guettara Group —Fossiliferous sandstone, limestone, and marl Adam Esseder Complex TMG JbTe Jbéliat Eg (Mesoarchean) Jbéliat Group Group Jbéliat Group Jbéliat Group Gr Gr with brachiopods and corals (Carboniferous) Guidamaka Suite Gabbro, hypersthene gabbro, leucogabbro, quartz diorite, HDa Adrar Super-Group JbTe Adrar Super-Group AEb Jb Jb Jb Jb In Dagouber Group —Fine-grained sandstone with brachiopods Metagabbro; also hornblendite, chloritite, pegmatitic gabbro, and ultramafic rocks (Paleoproterozoic) CO Çtel Ogmâne Complex —Migmatic gneiss (Mesoarchean) Groups, undivided Jbéliat Group Groups, undivided Adrar Super-Group Jbéliat Group Mbout Super-Group Mbout Super-Group Adrar Super-Group Id Agg Téniagouri and Jbéliat Téniagouri and Jbéliat and trilobites, fossiliferous claystone, coralline limestone (Devonian) and ultramafic rocks; inclusions of metachert and metabasalt HDc Jb El Mseiggeum Group El Mseiggeum Group Jb

Groups, undivided AEg Adrar Super-Group Granite and granodiorite (Paleoproterozoic) Tenemouj Group (Aouïnet Zbel, Dhlaïet el Ateuch, El Ahguid, (Neoproterozoic) Guelb Arâch Suite—Metagabbro, anorthosite, serpentinite, Téniagouri and Jbéliat Ms Ms HDm JbTe Tm GA

Groups, undivided and Guelb Makhsar Formations, undifferentiated) —Sandstone, hornblende±biotite gneiss and pegmatite (Mesoarchean) Adrar Super-Group Gabbro, tonalite, and granodiorite (Paleoproterozoic to

Téniagouri and Jbéliat GD AEm Monzogranite (Paleoproterozoic, 2059±4) Gorgol Noir Super-Group Gorgol Noir Super-Group commonly ferruginous and (or) quartzitic, with brachiopods Neoproterozoic, 665±3) Mylonitized granite and El Gueneiba Group El Gueneiba Group (Devonian) TC Tacarat Suite—Biotite orthogneiss (Mesoarchean)

C granitic augen gneiss AEp Monzodiorite, commonly porphyritic (Paleoproterozoic) I Gu Gu Zemmour Group Houi Damour Granite (Neoproterozoic, 675±10) Tasiast Suite O Pgmy Hd

Z Sub-group 1—Unfossiliferous argillite, marly limestone, AEpg Pegmatite (Paleoproterozoic) Bou Naga Suite Guf Zm1 TS Granite (Neoarchean) brachiopod coquina (Devonian)

O Gorgol Noir Bou Naga intrusive suite Gleïbat Tenebdar Suite R BNs Sub-group 2 —Phosphate-pebble conglomerate, limestone with Suite Super-Group Gorgol Noir Super-Group Gorgol Noir Super-Group TSg Granite (Mesoarchean) E Zm2 orthoceras and brachiopods, sandstone, siltstone, and claystone Tonalite, granodiorite, and pegmatitic gabbro BNz Gadel Group Gadel Group Gadel Group Sebkha Bou Naga Sub-suite —Feldspathoid syenite and monzo- GT T SDb (Devonian) BNs syenite cut by narrow dikes of phonolite (Neoproterozoic) (Paleoproterozoic, 2073±3, 2068±6, 2068±21) Ga Ga Ndaouâs Sub-suite—Tonalite and granodiorite O Ga Sub-group 3 —Argillaceous siltstone, coquinoid sandstone, Zm3 TSt SDm Bou Naga Granophyric hornblende microgranite (Paleoproterozoic) (Mesoarchean, 2912±36) R unfossiliferous claystone (Devonian) Zellaga Sub-suite—Syenite, quartz syenite, trachyte, and alkali GTm Microgabbro Alkaline Complex Gas Gas BNz P Bir Igueni granite —Biotite monzogranite SDa feldspar granite (Neoproterozoic, 680±10) TSb BNr —Orthogneiss, tonalite, and granodiorite O OcMg Selibabi (?) Suite Selibabi Suite AA Adam Anajim Suite (Mesoarchean, 2933±16) Tenemouj and l'Oued Chig Groups, undivided—See individual (Paleoproterozoic, 2129±6, 2063±4) E SDt Plg SB TmOg descriptions for Tenemouj and l'Oued Chig Groups (Silurian to N SAu —Serpentinite; layered metagabbro (Mesoarchean) Devonian) KB Kelbé Suite—Deformed biotite+muscovite granite and Tmeïmichatt Ghallamane Complex Saouda Group Kelbé Suite Adrar Super-Group Çangarafa Group (Kediat Mourzak, Ten Oumodje, and Kediat leucogranite (Neoproterozoic, 666±83, 772±49, 685±18) Kaang Naam Group Eizzene Group Biotite granite to biotite granodiorite with tourmaline+muscovite Temmimichate Tsabya Complex—Serpentinized metadunite, KB Cn Taggoura Formations) —Sandstone, quartz-rich sandstone, TGb pegmatites (Paleoproterozoic) TT metagabbro, amphibolite, anorthosite, and quartzofeldspathic Kg Ezf argillaceous sandstone, ferruginous sandstone with brachiopods, and Pbg Basalt and microgabbro (Neoproterozoic) Mbout Super-Group Biotite+amphibole diorite and amphibole gabbro gneiss (Mesoarchean) Guidamaka Suite Guidamaka Suite sandy shale (Silurian) TGd Ezk El Hneikat Formation (Paleoproterozoic) GD GD Gb Gara BouyaAli Group—Black argillite with graptolites (Silurian) AO Aoutitilt Suite —Granitic augen gneiss (Mesoarchean, 2954±11) Pse Serpentinite (Paleoproterozoic to Neoproterozoic) Biotite leucogranite with tourmaline pegmatite dikes Ezr Eh TGg Hodh Super-Group Hodh Super-Group l'Oued Chig Group —Sandy argillite, mudstone, and graptolitic black (Paleoproterozoic) l’Assabet El Hassiane l’Assabet El Hassiane Og shale, sandstone and siltstone with skolithos, locally ferruginous and Hodh Super-Group Mbédia Achar Suite —Harzburgite and dunite, variably Lbu Lebzenia Group—Ultramafic rocks (Mesoarchean) Group Group phosphatic (Silurian) MB TGl Garnet±cordierite leucogranite (Paleoproterozoic, 2078±5) Aïoun Group serpentinized (Neoproterozoic) Ahz Ahz Zednes Suite Hodh Super-Group An Th Toba el Hamar Group —Argillite with graptolites (Silurian) Pgm Gabbro and microgabbro (Neoproterozoic) TGp Granite to granodiorite (Paleoproterozoic, 2103±13) Ah Cheikhia Group ZDgp Porphyritic granodiorite (Mesoarchean) Djonaba Group Djonaba Group Djonaba Group Garat el Hamoueïd Group —Glaciogenic conglomeratic sandstone, Muscovite±garnet granite, muscovite+biotite granite Aht Aht Ck2 Gh TGm fine grained sandstone, and siltstone (Ordovician) (Paleoproterozoic, 2118±14) ZDm Monzogranite (Mesoarchean, 2902±11) Ahb DjNj DjNj Dj Gadel Group—Serpentinite and ultramafic rocks Tichit Group (Dakhlet Thiar, Khneg Ten Titane, Tabarit el Kbir, Gas Ahb Ahb Ck1 Paleoproterozoic to Neoproterozoic) Tin Bessaïs Complex Oued Nouehjenna and Aghouejilt Formations, undifferentiated) ZDmy Charnockite, foliated to mylonitic (Mesoarchean, 2915±18, 2856±6) 1000 1000 Ti Hodh Super-Group Hodh Super-Group Hodh Super-Group —Quartzose cross-bedded sandstone; argillaceous micro- TB Fine-grained granite with pegmatites dikes (Paleoproterozoic) Hodh Super-Group conglomerate and micaceous siltstone; argillaceous sandstone OcMg Gabbro and microgabbro (Paleoproterozoic to Neoproterozoic) Atar Group El Mreïti Group El Mreïti Group El Thlethyate Group Tonalite to granodiorite (Mesoarchean, 3044±5, 2832±4) C ZDt

I ROCKS OF THE MAURITANIDE OROGEN OF UNCERTAIN AGE with boulders; quartzite; argillaceous sandstone and micro- Em2 Em2 Et TBd Quartz diorite (Paleoproterozoic, 2145±5) O At2 conglomerate with skolithos (Upper Ordovician) Boutounguissi Formation —Metabasalt and metagabbro

- BT Z Em1 Em1 (Mesoproterozoic)

O Gàoua Formation

O

C Oua-Oua Group —Quartzite and quartz-rich sandstone with heavy At1 Em Em l’Oued Dibilal Complex Inchiri Complex Oo ARCHEAN ROCKS

I S Granodiorite to tonalite (Paleoproterozoic, 2121±5) R Ijibbitene Group TBg Em1 Em1 Agoualilet Group Go mineral horizons; included in El Ghabra Group north of 16 degrees

E E Rgueïbat Shield—Stratified Rocks Hodh Super-Group Guidamaka Suite (Ordovician) PROTEROZOIC ROCKS O ODe T Serpentinite M Hodh Super-Group Ibm Basalt and Souroukoto Group Hodh Super-Group Agt Metagabbro Mbout Super-Group Houi Damour Mbédia Achar O Mbout Super-Group Mauritanide Orogen–Stratified Rocks TBgn Orthogneiss (Paleoproterozoic)

Z Char Group Microgabbro Douik Group ODt Pse El Harach Group Granite Suite Adrar Super-Group R Agg El Harach Group So Aga Ib Pbg Tiris Complex P Ch O Do Hr Hd MB l'Erg Chech Group —Large-scale cross-stratified quartzose Metarhyolite, metabasite, microgranite and granodiorite to tonalite ODg Hr Ec Inchiri Complex TBgr sandstone (Ordovician) (Paleoproterozoic) El Khadra and Mirikli Formations, undifferentiated —Banded R 1600 1600 Hajar Dekhen Group–Kleouat TRf Oumat el Ham Group (Sub-group 1 and Sub-group 2) — iron formation and ferruginous quartzite (Neoarchean)

E Oh Tsalbia el Khadra Conglomerate, coarse-grained quartzo-feldspathic sandstone; Complex (Part Bir Moghreïn Suite Interlayered amphibolite and metasedimentary rocks, meta- Fderik granite Suite (Guelb el Tâouorta and Oumm Khamié T quartzite with scolithos, fossiliferous pelite (Ordovician) HDa FD El Gheicha Formation —Sillimanite-cordierite-garnet paragneiss, GEOLOGIC PROVINCES OF MAURITANIA AND REGIONS NAMED IN CORRELATION CHART Paleoproterozoic) microgabbro, quartzite (Neoproterozoic) Sub-suites) —Syenogranite, granite, granodiorite, gabbronorite, Trg Tigsmat el Akhadar BMg Tigsmat el Akhadar locally migmatized; rare lenses of amphibolite and ferruginous O Oujeft Group (Aghaoujeft Sub-group and Beddamez, , gabbrodiorite, anorthosite, quartz diorite Oj alkaline Suite KH alkaline Suite Moudjéria, Rachid, Ganeb, l'Oued Touerga, Oued Touerga, Foum Marble, calc-silicate rocks, mafic schist, clinopyroxene+potassium (Paleoproterozoic, 2472±6) quartzite (Neoarchean)

R BMa HDc -16° -14° -12° -10° -8° -6° -16° -14° -12° -10° -8° -6° Nbeïka, and Terguent Formations, undifferentiated) — feldspar calcic skarn (Paleoproterozoic to Neoproterozoic) TAs TAs P Predominantly red and pink quartzose sandstone (≤524); also feldspathic El Khadra Formation —Mica+quartz schist, quartzite, biotite gneiss, BMb Trk Metasedimentary rocks (quartzitic gneiss (≤538), quartz-mica schist, and migmatitic gneiss, granite, amphibolite, calc-silicate rocks, ferruginous sandstone, microconglomerate, micaceous siltstone, and mudstone HDm TAp TAp garnet-cordierite gneiss) interlayered with gneiss and leucogranite BMs (Cambrian to Ordovician) PROTEROZOIC ROCKS quartzite, and BIF (Neoarchean) Oujeft and Nouatil Groups, undifferentiated—See individual (Proterozoic to Paleozoic) TAg TAg Ferruginous quartzite (Mesoarchean) A l g e r i a NoOj descriptions for the Nouatil and Oujeft Groups (Cambrian to Rgueïbat Shield—Stratified Rocks Trqf A l g e r i a Yetti Suite Yetti Suite OU E D E L TA Ordovician) Oumachoueima Group HAMR A TA 26° RTH-YETTI 26° 26° 26° Yg Yg Nouatil Group (Aouint Amogjar, Amogjar, Achram, Aïn-Tourfine, Sainte Barbe, Atomai, and Akjoujt Formations, undifferentiated Rich Anajim Complex NO RTH-YETTI Ocf Amsaga Complex H A SSI DJEBD I LEE T NO HASS I No Terjit Aguinjob, Dakhlet Barda, Ferlankobé, Hofret ej Jenna, —Banded iron formation, undifferentiated (Proterozoic to Paleozoic) DJE BIL E T Yl Garnet amphibolite including metagabbro, metapyoxenite 26 08 2 60 7 25 0 6 l'Oujaft, Serize, and Toueïjigjît Formations, undifferentiated) RA 2 51 1 E L BIR 25 0 5 (Paleoproterozoic) AMa Metabasite, amphibolite (Mesoarchean) AGU E L T ≤ C H E G G A BE L AIN BE N HASS AN LE MJE D C HE G GA —Red, fine-grained sandstone ( 601) and siltstone; minor dolostone E L HABIB Yc G UE RD AN TILI OU LD Irarchene El Hamra Formation and Atilis quartzite Member NORTH-EAST O UL D (Cambrian) Migmatic paragneiss with calc-silicate boudins (Paleoproterozoic) BIR HAME D NORTH-EAST Sfariat Suite —Basal quartzose metasandstone with local migmatite, tourmalinite, RAgn BIR M O G H R EÏN Western 25 0 9 BR AH IM Sfariat Suite Western ZEMMOUR ZEMMOURMOG H R E IN 25 10 25 08 25 07 Boutounguissi Oci G LE IBAT TME IMIC HAT T Kreb En Naga Group —Coarse-grained sandstone, red pelite, and and marble; phyllite, slate, pelitic schist, and metagraywacke with 24° 24° 24° TIG SMAT BL E K H- E L MZ E R E B 24° AMf Banded iron formation (Mesoarchean) EL MZEREB T O UR AS SIN T E NE BD AR GH AL LAMANE Formation SF SF Kn Sahara NORTH Sahara Z AY MAT calcareous mudstone; minor bioclastic limestone with brachiopods minor metavolcaniclastic rocks (Proterozoic) RAq Magnetitite-bearing quartzite, dolomitic marble (Paleoproterozoic) NORTH EXPLANATION OF MAP INDEX Gleïbat Tenebdar Suite (Cambrian) HANK-CHEGGA 2 41 1 24 1 0 24 09 24 08 24 07 240 6 BT C (Moroc) HANK-CHEGGA Akjoujt Formation —Metabasite, microgabbro, meta-andesite, I (Moroc) Guelb Zednes Formation—Magnetite-bearing quartzite, Metasedimentary rocks, undifferentiated—sillimanite+cordierite+ E L MR E ITI AGAR AK TE M GTm Blekhzaymat Tamkarkart Formation —Quartzite, micaceous quartzite, and calc-chlorite schist, and metasedimentary schist (Proterozoic) AMs O UMM Z E DN E S RH ALL A- TIN Tk Ocj RAz garnet gneiss, quartzite, schist, and marble (Mesoarchean) O R O UE ISS IN E MANE BE SSA IS semipelitic microconglomeratic schist, locally mylonitic (Cambrian) amphibolite, kyanite schist, metaconglomerate (Paleoproterozoic) 23 12 Group O UMM Z FDEDEERIE K CENTRAL CENTRAL GT DF E IR AT 2 31 1 231 0 23 09 23 08 23 07 23 06 Coastal Basin Sainte Barbe and Atomai Formations, undifferentiated — TOU R INIE HANK Ghallamane Complex BZm O 22° 22° 22° AG UE LT BIR HANK 22° PALEOZOIC TO PROTEROZOIC ROCKS Volcanogenic siltstone and greywacke metamorphosed to Tectonically interleaved, variably migmatized gneiss, schist, and EL MREÏ T I T E NO UME R E L MABH A AMR ANE ME JAO U DA OG LAT Seyala Formation—Massive conglomerate with clasts of AMgn

R F D E R IK T O UR INE chlorite±sericite+quartz±carbonate schist; intermediate to felsic R AME IDN AT Tmeïmichatt Ghallamane Ocs amphibolite (Mesoarchean) Mauritanide orogen GL BZn l'Azlaf Group (Sub-group 1 and Sub-group 2) —Blackish Sy ferruginous quartzite, iron formation, and quartzite E Complex Az volcanic rocks and related volcaniclastics (Proterozoic to Paleozoic) 22 12 2 21 1 22 1 0 22 09 22 08 22 07 2 20 6 laminated, silicified pelites grading to multicolored, poorly indurated (Paleoproterozoic) T EL GLs NORTH-WEST CHAR Saouda Group NORTH-WEST GUELB ER G HALL A- BO U E L AR OU AK IM OG LAT E L TGd pelites. (Neoproterozoic to Upper Cambrian) O R IC HAT OUIYA JE R T ALA MR AY E R F E R SIG Tindouf Basin (north) and Ijil Complex (El Mhaoudat Unit and Achouil, El Hadej, El Felsic metavolcanic rocks, marble, quartzite, and mafic metavolcanic

R —See ATTAT R O UAD A N E 21 12 2 11 1 21 1 0 21 09 21 08 2 10 7 2 10 6 TGg JbTeNo Nouatil, Téniagouri and Jbéliat Groups, undifferentiated Eizzene Group IJ SAa 20° E L MR AYER 20° 20° CH AMI AHME Y IM AT AR 20° Zemmour (north-west) Hamariat, Tazadit, and Zouerat Formations, undifferentiated) rocks (Mesoarchean) P individual unit descriptions (Neoproterozoic to Cambrian) SOUTH-WEST O UADANE TO U E Y- TEYY AR E T T AC AR AT E L B E L ALAB HABR O U SOUTH-WEST Y IR AT E L O UASS A Khmeiyat Formation —Ferruginous quartzite, garnet+staurolite+amphibole schist, NOUAUADHUA HIB O U CH IN - F SAL E L ALBE G DO UR O TGl ADRAR amphibolite, marble, dolostone, and micaceous metasandstone ADRAR G UE TT I Taoudeni Basin PROTEROZOIC ROCKS SAf 20 15 20 14 2 01 3 2 01 2 20 1 20 1 0 20 09 20 08 2 00 7 2 00 6 20 0 5 Banded iron formation (Mesoarchean) E 1 Adam Anajim Suite Adam Anajim Suite Adam Anajim Suite Ezf Banded iron formation (Paleoproterozoic to Neoproterozoic) TGb (Paleoproterozoic) L NO E L ADAF E R (Mesozoic to Cenozoic) RTH F AR 'AO U N E L MO INAN HO F R AT ABO LAG O UMM AKR AT IL E L F E LJE Taoudeni Basin NORTH NO UAMG HAR AK JOU JT GL E IT AT E L ABIO D SARD O UN AH MAR AA AA AA A CENTRAL-NORTH Pelitic and semipelitic phyllite and schist; minor quartzite and CENTRAL-NORTH TGp Ezk P Téniagouri Group (Koumba Ndao Sub-group, Tichilit Dhlémi Unit, A RAT ANE 19 15 19 14 19 13 1 91 2 1 91 1 19 1 0 19 09 19 08 19 07 1 90 6 19 0 5 Taoudeni Basin metasubgraywacke (Paleoproterozoic to Neoproterozoic) NOUAKCKCCHOT T T IDJ IKJ A and Ould Yenje, Ourkem, Goure Téniagouri, Bhtaat Ergil, Tsalabia el Khadra Complex TTc Temmimichate Tsabya Complex—Marble (Mesoarchean) 18° 18° 18° KS AR E L T IDJIK JA AR AT ANE KE DAMA AKLE T - MG AT 'A 18° Legleya Group NO UAKC HO T T AG UILAL BIR G ANE B TICH IT TGm AKJOOUJO T FAI BAR K A AWANA T AU R JE (Neoproterozoic to Paleozoic) Formations, undifferentiated) — Basal baritic dolostone, locally Raoui Formation —Metabasalt; minor orthoquartzite Quartzite, separated from rest of Complexe de Tsalabia el Khadra AL LAH LG Ezr KHq 1 81 1 Te sandy; silicified green and mauve mudstone with felsic tuff layers; (Paleoproterozoic to Neoproterozoic) on the basis of detrital zircon results (Neoproterozoic, ≤581) TAGANT 18 15 18 14 1 81 3 1 81 2 18 1 0 18 0 9 18 08 18 07 1 80 6 18 0 5 TAGANT Adam Esseder Tin Bessaïs Lebzenia Group Rgueïbat Shield Rich Anajim Complex Rich Anajim Complex feldspathic, micaceous, and calcareous siltstone and shale; and Metapyroxenite, metagabbro, metah yaloclastite, amphibolite, CENTRAL-SOUTH AL E G MO UD JE R IA T AM- BO U Complex CENTRAL-SOUTH BO UMD E ID OU TF E N E O UAL AT A NK HAILE Z O UIN A NIMJAT BO UT ILIMIT Complex ≤ Bou Naga alkaline complex C H E K KE T DE R G A feldspathic sandstone turbidites ( 601) with interbedded tuff KH quartzite, marble, metaandesite, metarhyolite, metaconglomerate, Aouéoua Formation —Actinolite schist, amphibolite, quartzite, TBgr Adam Esseder Tin Bessaïs Lb RAgn RAgn AEpg (635±7; 604±6; 610±5; 615±18, 624±6) (Neoproterozoic) —Rhyolite, rhyolitic metatuff, and quartz+muscovite schist, and mafic and felsic metavolcanic rocks K IFF A 1 71 3 1 712 17 1 1 17 1 0 17 09 17 08 1 70 7 1 70 6 1 70 5 Complex l'Oued Tidoumaline Formation and metaarkose (Paleoproterozoic) NEM A Z O U I N A Complex BNr (Mesoarchean, 2968±2) 16° 16° 16° AY O UN E L 16° rhyodacitic, ignimbrite; subordinate volcaniclastic rocks and dacite; SA INT K IFF A T IN TANE TIMBE DG HA HASS I KAE DI MBO UT AT R O US NE MA NIO UT RAz RAz TBd L O UIS T O UIL Imourène Group AEm Imourène Group AEm TBd Téniagouri and Jbéliat Groups, undivided —See individual unit locally mylonitic (Neoproterozoic, 680±10) AFOLLÉ/HODH AFOLLÉ/HODH JbTe Aouéoua and Sebkhet Nich Formations, undifferentiated — 16 1 6 16 15 16 14 0 16 0 9 16 08 16 07 1 60 6 1 60 5 RAq RAq TBg descriptions for the Téniagouri and Jbéliat Groups (Neoproterozoic) —Amphibolite, garnet amphibolite, Lbf IMs AEp IMs TBg MA Aguelt abd el Maï Complex Banded iron formation (Mesoarchean) NIO R O Gorgol Noir Super-Group DJIGUENI BASSS IKOUNK O U M BALL E NAR A S E G E NAMPA LA porphyritic metadacite, calc-gneiss, and quartzite (Paleoproterozoic) KANKOSSK A E TB Jbéliat Group (Kouériat el Khadra Unit and Nagara Formation) S e n e g a l SELIBAABA S e n e g a l RA RA IM AEg IM AEg Gueneiba Group 10 15 0 9 15 08 15 07 1 50 6 1 50 5 Jb —Green mudstone and diamictite, interbedded with mauve to red, 14° SOUTH-EXTREME 14° 14° SOUTH-EXTREME 14° Seyala Formation TBgn TBgn parallel laminated mudstones and grey sandstones (Neoproterozoic) Hamdallaye, l'Oued Amour, and El Aoueïja Formations, M a l i BAK E L K AY E S AEb Imourène Group M a l i AEb Gu undifferentiated —Calc+chlorite schist, chlorite±talc±amphibole VARIOUS AGES ÉLÉMENT S STRUCTURAUX ÉLÉMENT S STRUCTURAUX1 41 2 1 41 1 Sy Igneous components —Microgranite, microgranodiorite; porphyritic Aguelt abd el Maï schist, and deformed metabasalts (pillow lavas and breccias) meta- IM -16° -14°-12° -10° -8° -6° -16° -14°-12°12° -10° -8° -6° Khang Naam Group (Lehbilé and El Aguer Formations, andesitic to dacitic tuff; rhyolite, rhyolitic ignimbrite my Fault rocks: breccia, cataclasite, mylonite, and ultramylonite Fdérik Suite Complex morphosed to middle upper greenschist facies (Neoproterozoic) Kg undifferentiated) —Shale, siltstone and fine sandstone with rare (Paleoproterozoic, 2067±9) l'Oued Amour Formation —Banded iron formation, ferruginous FD MA granite pebbles; fine to coarse-grained quartzose sandstone with Guf Sedimentary components —Conglomerate, quartzite, locally Index to 1:500,000-scale geologic maps Index to 1:200,000-scale geologic maps jaspilite (Paleoproterozoic to Neoproterozoic) IMs qz Quartz and (or) carbonate veins Idjil Complex megaripples (Neoproterozoic; ≤870) conglomeratic, sandstone, arkose, tuff, lahar (Paleoproterozoic) IJ Gadel Group—Mélange of serpentinite, talc schist, chlorite schist, Ga mu Ductile melange of mafic and ultramafic schists 2500 2500 Hodh Super-Group and pelitic schist, banded iron formation, quartzite, and amphibolite, Blekhzaymat Group Dunite-carbonate Anorthosite Zemzem Metagranite Ouarkziz Group —Pelitic sandstones with marine fauna; limestones locally mylonitized (Neoproterozoic, 637±4 (minimum age)) breccia Ou Pan Ahmeyim Grand Dike with large brachiopods (Carboniferous) Aïoun abd el Malek Formation—Conglomerate, ZZ ADu BZm sandstone (≤2094), pyroclastite, and felsic tuffaceous schist; N Ultramafic rocks Tiris Complex Djonaba Group (Dôouàra Formation and Aguerj, Chelkhet AY rhyolite sill (Paleoproterozoic, 2069±10) A Çangarafa Aioun Group (Bou Habcha, Freïdi, and Seyal Formations, Dj undifferentiated)—Quartzose sandstone, pebbly sandstone, Metagabbro Metagabbro Pub Iguilid Suite TRf An E Metagranite undifferentiated) —Quartzose sandstone and conglomeratic chloritic metasiltstone, and quartz-sericite schist (Neoproterozoic; ≤982) ≤ Aguelt Nebk ha Formation —Quartzite, quartzose metasiltstone, H Agb Agb sandstone, channeled and cross bedded (Neoproterozoic; 878) BZn CN Gabbro IG Trk calcareous metasandstone, and tuff (2113±17, 2104±13) locally C contact metamorphosed (Paleoproterozoic) Pyroxenite Pyroxenite AG Ductile melange l’Assabet el Hassiane Group Mbout Super-Group R Touijenjert-Modreïgue Trm Px Px mu A Suite Pegmatite Abiodh Sub-group, Taleb and Akhdar Formations , El Fadra Group (Barkéouol and Oued Kav Formations, MAURITANIDE OROGEN Ah Fr Legleya Group—Felsic volcanic rocks, tuff, granophyre, O Sodalite syenite TJp Trg undifferentiated —Sandstones (medium to fine grained); siltstone undifferentiated) —Schistose volcaniclastic and epiclastic meta- LG Apg ≤ microgranite, microgabbro, and basalt (Paleoproterozoic, 2072±6) E Tectonic window into Archean basement sy and argillite (Neoproterozoic) sedimentary rocks ( 553) with subordinate felsic to mafic volcanic rocks TJg (Neoproterozoic) N Trle Ioulgend Granite Tasïast Suite Ti-n-Bessaïs Formation —Coarse-grained, cross-bedded sand- Tasïast Suite Amsaga Complex Amsaga Complex Ahb stone; glauconitic sandstone with hummocky cross stratification El Ghabra Group (Oued Erdi, Ould Moïlîd, and Oua Oua

N Amsaga TS Aml Aml IGo TS Trla ≤ Gr Ghallamane Complex Complex (Neoproterozoic; 975) Formations, undifferentiated) —Chlorite+quartz+sericite+hematite

A 2800 2800 Taguilalet and Oued Oreouar Formations, undifferentiated — schist and phyllite; micaceous quartzite (≤594); and mafic and felsic meta- GL Amphibolite (Paleoproterozoic) Arhdéjit Leucotonalite AMgn AMgn AMgn TSg Aht E Trqf Fine-grained ferruginous and glauconitic sandstones, siltstone, and volcanic rocks (Neoproterozoic to Paleozoic) Art Guelb Arâch Suite laminated dolostone (Neoproterozoic) Metasedimentary rocks undifferentiated—aluminous and H AMa AMa El Mseigguem Group (Bathet Jmel Formation) —Basal chlorite ≤ TSt TSt GLs calcareous gneiss, quartzite ( 2083), meta-arkose, and Tamagot Orthogneiss Zreigât Sub-group —Medium- to coarse-grained, cross-bedded schist (meta-andesite); phyllite and sericite+feldspar+quartz schist C GA Ahz biotite+andalusite+sillimanite+cordierite+staurolite schist AMf and ripple-laminated sandstone (Neoproterozoic) Ms (meta-felsite); pelitic schist, chlorite schist, metatuff, and meta- TMG TSb (Paleoproterozoic, 2180±8) R basaltic breccia (Neoproterozoic) Cheikhia Group AMc AMc Temmimichate Tsabya A Lebzenia Group Lebzenia Group Amsaga Complex Sub-group 1—Coarse- to fine-grained sandstone; minor pelite Ck1 Agoualilet Group Complex AMs Lbf (Neoproterozoic)

N Saouda Group Saouda Group Lb Lbf Lb TTc AMg A Sub-group 2 —Glauconitic sandstone and laminated dolostone Adam el Bouje Formation—Metabasalt, some pillowed, and SAa SAa AMg Lbu Ck2 Aga

E TT (Neoproterozoic) subordinate metagabbro (Paleoproterozoic to Neoproterozoic)

H SAf SAf Tacarat Suite Saouda Group Treïfiyat Formation —Metabasalt (lavas and breccias), and

C Agf TC chlorite+/-sericite schist (Paleoproterozoic to Neoproterozoic)

R SAu SAu

A Toueirja Sub-group —Quartz mica schist, pelitic schist and meta- Aoutitilt Suite Agt

O sedimentary rocks (Paleoproterozoic to Neoproterozoic) AO S Zednes Suite

E ZDm

M Çtell Ogmâne Complex ZDmy CO This map was produced as part of the "Second Projet de Renforcement Institutionnel du Secteur Minier (PRISM II)" ZDgp co-financed by the Government of Mauritania and the World Bank (Credit No. IDA-38100 MAU). ZDt