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Mauritania Legend Oct 28 201

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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 Mauritania (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 Tawaz 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 Oualata 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 Tichit 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
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