Bibliography on the younger granite ring complexes and tin mineralization in West Africa with emphasis of Nigeria

Abba, 1976, Geochemistry and petrology of mineralisation at Ririwai, Gindi, Akwati and Dutsen Wai in the Nigerian Younger Granite Province Abba, 1978, Some chemical and petrographic aspects of mineralisation in the Ririwai biotite granite, Nigeria, 1 Abba, 1979, Correlation between Sn and Zn values in some rocks from the Nigerian Tin Province, 16, 85 Abba, 1982, The geology, geochemistry and petrogenesis of the Mada Younger Granite Complex, Plateau State, Nigeria, 294 Abba, 1982, Tin-Zinc mineralisation in the Younger Granite Province of Nigeria, Nigerian J. nat. Sci. Abba, S. I. Petrographic and chemical aspects of primary SnZnPbZn mineralisation at Gindi-Akwati in the Nigeria Tin Province (in preparation). Ademiluyi, 1977, Applicability of geophysical methods in the detection of the Ririwai Tin Lode—A case study Abernethy, 1982, Petrology and mineral chemistry of biotite granites from the Younger Granite Province of Nigeria Ajakaiye, 1968, A gravity interpretation of the Liruei Younger Granite Ring Complex of Northern Nigeria, Geol. Mag., 105, 256, 10.1017/S0016756800052274 Ajakaiye, 1970, A gravity survey of the Nigerian Younger Granite Province Ajakaiye, 1970, Gravity measurements over the Nigerian Younger Granite Province, Nature. Lond., 225, 502, 10.1038/225050b0 Ajakaiye, 1974, A gravity profile across the Banke Ring Complex, Nigeria, Geoexploration, 12, 59, 10.1016/0016-7142(74)90007-6 Ajakaiye, 1974, Three-dimensional gravity interpretation of the Dutsen-Wai complex, Nigerian Younger Granite Province, 11, 113 Ajakaiye, 1975, Densities of rocks in the Younger Granite Province, J. Min. Geol., 11, 33 Ajakaiye, 1975, Densities of rocks in the Nigerian Younger Granite Province, 225 Ajakaiye, 1975, A gravity survey over the Nigerian Younger Granite Province, 207 Ajakaiye, 1981, Aeromagnetic anomalies across the Nigerian Younger Granite Province Ajakaiye, 1982, Preliminary interpretation of the Aeromagnetic anomalies across the Central Nigerian Pre-Cambrian Shield Ajakaiye, 1982, Aeromagnetic anomalies across the Nigerian Younger Granite Province, 68 Ajakaiye, 1973, A Bouguer gravity map of Nigeria, Tectonophysics, 7, 103, 10.1016/0040-1951(73)90134-0 Alelsiyev, 1970, Genetic significance of the rare earth elements in the Younger Granites of Northern Nigeria and the Camerouns, Geochem. Int., 7, 127 Alelsiyev, 1970, Rare earth elements in Younger Granites of Northern Nigeria and Camerouns and their genetic significance, Geokhimiya, 2, 192 Amosu, 1980, Gravity survey of Dutse Complex in Kano State of Nigeria Atawodi, 1981, A north-south geological traverse of the volcanic rocks of the Buji Complex Badejoko, 1973, Geochemistry of Sara-Fier and Jos-Bukuru Complexes, Northern Nigeria Badejoko, 1975, Role of adiabatic crystallization and progressive melting in the origin of the Younger Granite-Sara-Fier Complex, 195 Badejoko, 1975, Evidence for magmatic differentiation in the origin of Younger Granites of Nigeria, J. Min. Geol., 10, 42 Badejoko, 1976, On the mafic, felsic and hybrid enclaves in the Younger Granites of the Sara-Fier Ring Complex, 13, 54 Badejoko, 1976, Source of tin in the Younger Granites of Nigeria, 21 Badejoko, 1977, The composition and structural state of Kfeldspar and their bearing on the evolution of Younger Granites of Central Nigeria Badejoko, 1979, Composition and structural state of Kfeldspars from Jos-Bukuru Complex, Northern Nigeria, 16, 86 Badejoko, 1979, Modern concept on the evolution of the Younger Granites of Nigeria, 16, 87 Badejoko, 1979, Composition and structural state of Kfeldspars from Kila-Warji Complex, Northern Nigeria, J. Min. Geol., 16, 125 Badejoko, 1979, Fluorine abundance in the Jos-Bukuru Younger Granite Comples of Nigeria with comments on petrogenesis, J. Min. Geol., 16, 41 Bahat, 1980, A Hertzian Quasi-oval fracture model for Ring Complexes, J. Min. Geol., 88, 271, 10.1086/628507 Bain, 1934, The Younger intrusive rocks of the Kudaru Hills, Nigeria, J. geol. Soc. Lond., 90, 201, 10.1144/GSL.JGS.1934.090.01-04.08 Beer, 1952, The petrography of some of the riebeckite granites of Nigeria Bennett, 1977, Petrology of the minor North-eastern Younger Granite Ring Complexes, 14, 58 Bennett, 1981, The petrology and mineral chemistry of the Shira Ring Complex, Northern Nigeria Bessoles, 1980 Bigotte, 1973, World Mining, 34 Bigotte, 1968, Mineral Deposits, 3, 317, 10.1007/BF00207524 Black, 1958, The geology of the Rop Complex, Northern Nigeria Black, 1970, Late Palaeozoic to Recent igneous activity in West Africa and its relationship to basement structure, 185 Black, 1967 Borley, 1963, Geochemistry of the mafic minerals in some Younger Granites of Nigeria Borley, 1963, Amphiboles from the Younger Granites of Nigeria, Part I, Chemical classification, Min. Mag., 33, 358, 10.1180/minmag.1963.033.260.02 Borley, 1976, Aenigmatite from an aegirine-riebeckite granite, Liruei Complex, Nigeria, Min. Mag., 40, 595, 10.1180/minmag.1976.040.314.06 Borley, 1976, Ferromagnesian mineralogy and temperature of formation of the Younger Granites of Nigeria, 159 Borley, 1963, Some observations of igneous ferrohastingsites, Min. Mag., 33, 646, 10.1180/minmag.1963.033.263.03 Bowden, 1961, Trace element in Younger Granites of Nigeria Bowden, 1964, Gallium in Younger Granites of Northern Nigeria, Geochim. Cosmochim. Acta, 28, 1981, 10.1016/0016-7037(64)90141-3 Bowden, 1966, Lithium in Younger Granites of Northern Nigeria, Geochim. Cosmochim. Acta, 30, 555, 10.1016/0016-7037(66)90011-1 Bowden, 1966, Zircanium in Younger Granites of Northern Nigeria, Geochim. Cosmochim. Acta, 30, 985, 10.1016/0016-7037(66)90113-X Bowden, 1970, Origin of the Younger Granites of Northern Nigeria, Contr. Miner. Petrol., 25, 153, 10.1007/BF00389784 Bowden, 1980, Magmatic evolution and mineralisation in the Nigerian Younger Granite province Bowden, 1980, Magmatic evolution of subsolidus changes included during mineralisation of the Nigerian Younger Granites Bowden, 1982 Bowden, 1977, Implications of the isotopic evidence and volcanic rock types for the origin and evolution of the Nigerian Younger Granite Province, 14, 58 Bowden, 1981, Uranium in the Niger-Nigerian Younger Granite Province, Min. Mag., 44, 379, 10.1180/minmag.1981.044.336.03 Bowden, 1979, Rare-earths in Nigerian Mesozoic Granites and related rocks, 479 Bowden, 1978, Mineralisation in the Younger Granite Province of Northern Nigeria, MAWAM, 3, 179 Bowden, 1978, Younger Granites of Nigeria. A Zinc-rich Tin Province, Trans. Imm., 87, 65 Bowden, 1974, Peralkaline and Associated Ring Complexes in the Northern Nigeria-Niger Province, West Africa, 330 Bowden, 1971, Isotopic and Chemical Studies of Younger Granites from Northern Nigeria Bowden, 1976, Palaeozoic and Mesozoic Age trends for some Ring Complexes in Niger and Nigeria, Nature, Lond., 259, 297, 10.1038/259297a0 Bowden, P. and van Breeman, O. Age of some Ring Complexes in Southern Niger (in preparation). Bowden, 1974, Rare-earth patterns in peralkaline and associated Granites, Lithos, 7, 15, 10.1016/0024-4937(74)90033-4 Bowden, 1975, Geochemical studies on the Younger Granites of Northern Nigeria, 177 Briden, 1973, Palaeomagnetic estimate of the age of the Sabaloka Complex, Sudan, 39 Brown, 1972, Experimental studies concerning the genesis of Nigerian Granites, 38 Brown, 1973, Experimental studies concerning the genesis of the Nigerian Younger Granites, Contr. Miner. Petrol., 40, 131, 10.1007/BF00378170 Buchanan, 1971, The geology of the Jos Plateau Younger Granite Complexes, Bull. Geol. Surv., Vol. 2 Bungwon, 1982 Butler, 1982, K/Rb ratios in the evolution of the Younger Granites of Northern Nigeria, Geochim. Cosmochim. Acta, 26, 89, 10.1016/0016-7037(62)90008-X Butler, 1963, Caesium in some Alkali Granites (Younger Granites) of Northern Nigeria, Geochim. Cosmochim. Acta, 27, 769, 10.1016/0016-7037(63)90041-3 Chadwick, 1951, Chemical composition of Nigerian columbite, Col. Geol. Min. Res., 2, 308 Clifford, 1970 Darnley, 1962, The age of fergusonite from the Jos Area, Northern Nigeria, Min. Mag., 33, 48, 10.1180/minmag.1962.033.256.07 De Swardt, 1956, Recent erosion surfaces on the Jos Plateau Province, 160 Didier, 1973, The enclaves of subvolcanic granites: The massifs of Sara-Fier and the Pankshin Hills, Nigeria Dixey, 1949, The morphology of Jos Plateau, Bull. Geol. Surv. Nig., 19, 74 1972 Eborall, 1974, Comments on experimental studies concerning the genesis of the Nigerian Younger Granites, 159 Ekwere, 1972, Economic geology and geochemical dispersion around Ririwai (Liruei, Kano) zinc-tin deposits Ekwere, 1977, Preliminary studies on bedrock geochemical prospecting for tin and associated metals in the Younger Granite Province, 14, 60 Ekwere, 1980, Aspects of Sn-Zn mineralisation in the Ririwai Lode, Younger Granite Province, Nigeria, J. Min. Geol., 17, 23 Ekwere, 1981, Mineralogy of the base metal sulphides and associated opaque minerals in the Banke and Ririwai Complexes, Northern Nigeria, 20 Etim, 1979, Geophysical map of the geological structures of Ginya Hills in the Banke Ring Complex of Kaduna State, Nigeria, Unpublished report of the Nigerian Mining Corporation Etim, 1981, Geophysical impression of the Bangwelli tin lode prospect, Unpublished report of the Nigerian Mining Corporation Evans, 1981 Fadipe, 1982, Chemical composition of niobotantalites from the granite pegmatites and alkali granites of Nigeria, 14 Fakorede, 1981, Reports on Banke Ring Complex Falconer, 1911 Falconer, 1926, Zarandah Hill, Geol. Surv. Nig. Bull., 9, 65 Fournier, 1980, Les Granites et Structure Circulaire du Nigeria (Younger Granites) et du Hoggar (Taourirts), Mémoire de DEA 1 Freeth, 1969, Chemical analyses of Nigerian igneous and metamorphic rocks and minerals up to 1968, J. Min. Geol., 4, 83 Freeth, 1970, The petrogenesis of the Younger Granites of northern Nigeria and southern Niger, 121 Furon, 1963 Giorgi, 1976, Géologie de l'Afrique, Memoire DEA Grant, 1971, A compilation of radiometric ages from Nigeria, J. Min. Geol., 6, 37 Greenwood, 1948 Greenwood, 1951, Younger intrusive rocks of Plateau Province, Nigeria, compared with Alkali Rocks of New England, Bull. geol. Soc. Am., 62, 1151, 10.1130/0016-7606(1951)62[1151:YIROPP]2.0.CO;2 Haag, 1943, Wolfram in Nigeria: with notes on Cassiterite, Wolfram and Columbite Zones, Trans. Inst. Min. Metall., 52, 119 Hawkins, 1980 Hawkins, 1981, Reports on Ririwai Complex, No. 81/1 Heinrich, 1963, Xenotime and Thorite from Nigeria, Am. Min., 48, 206 Hosking, 1957, The relationship between primary deposits and granitic rocks, 1, 267 Hossain, M. T. Mineral Chemistry of the Riebeckites of Nigerian Younger Granite Province (in preparation). Ike, 1977, Preliminary report on the geology of the Tibchi Younger Granite Ring Complex, Bauchi State, Nigeria, 14, 63 Ike, 1979 Ike, 1981, Constraints in the structural evolution of the Nigerian Younger Granites Ring Complexes—A case study, 33 Ike, 1982, Electron microprobe investigation of iron-titanium oxide minerals from the Tibchi Complex, Bauchi State, Nigeria, 12 Imeokparia, 1977 Imeokparia, 1980 Imeokparia, 1981, Cluster analysis of geochemical data from tin-tungsten bearing Afu Younger Granite Complex, Central Nigeria, 36 Imeokparia, 1981, Fluorine in biotites from the Afu Younger Granite Complex, Central Nigeria, Chem. Geol., 32, 247, 10.1016/0009-2541(81)90147-9 Imeokparia, 1982, Petrological and geochemical characteristics of some Nigerian Mesozoic Granitic Rocks Hosting Sn, W, Nb and U. mineralisation Imeokparia, 1982, Application of discriminant analysis to the characterisation of mineralized and bearer rocks of Afu Complex, Central Nigeria, Nigerian J. Sci. Jacobson, 1947, The Younger Granite Complex of the Liruei Hills, Nigeria, Ph.D thesis Jacobson, 1950, Geology and mineralogy of the Liruei Lode, Geol. Surv. Nig., 7 Jacobson, 1972, Geology of the Liruei, Banke and adjacent Younger Granite Ring Complexes, Bull. Geol. Surv. Nig. Jacobson, 1958, Ring Complexes in the Younger Granite Province of Northern Nigeria, Mem. Geol. Soc. Lond., 1 Jacobson, 1963, Age determinations in the Geology of Nigeria, with special reference to the Older and Younger Granites, Overseas Geol. Miner. Res., 9, 168 Jefford, 1962, Xenotime from Rayfield, Northern Nigeria, Am. Min., 47, 1467 John, 1954, A note on the occurrence of columbite in the Younger Granites of the Jos Plateau, Nigeria, Geol. Mag., 91, 245, 10.1017/S0016756800065201 Kayode, 1971, A kaolinite greisen from Dorowa-Babuje, northern Nigeria, Econ. Geol., 66, 811, 10.2113/gsecongeo.66.5.811 Kinnaird, 1976 Kinnaird, 1977, Younger Granites of Nigeria—A Zinc-rich Tin Province, 14, 63 Kinnaird, 1979, Mineralisation associated with the Nigerian Mesozoic Ring Complexes, Vol. XIV, 189 Knorring, 1959, An occurrence of genthelvite in the Younger Granite Province of Northern Nigeria, Amer. Min., 44, 1294 Kotanski, 1976, The Tudun Wada graben in the Jos Township, 13, 78 Kovalienko, 1969, Distribution of the REE and Y in minerals of alkalic granitoids, Geochem. Int., 790 Kroner, 1979, Pan African plate tectonics and its repercussions on the crust of northern Africa, Geol. Rdsch., 68, 565, 10.1007/BF01820807 Mackay, 1952, The Albite-Riebeckite granites of Nigeria, Geol. Surv. Gt. Britain Atomic Energy Div. Report, 1 Mackay, 1952, The geology of the Plateau Tinfields Resurvey 1945–1948, Bull. Geol. Surv. Nigeria Macleod, 1956, The Geology of the Jos-Bukuru Younger Granites Complex, with particular reference to the distribution of Columbite, Geol. Surv. Nigeria Report 17–34 (1954) Macleod, 1957 Macleod, 1971, The geology of the Jos Plateau, Vol. 1, General Geology, Bull. Geol. Surv. Nigeria, 32 Marmo, 1968, On the granites of northern Ivory Coast, Jos Plateau of Nigeria and northern Cameroun, 95 Martin, R. F. and Bowden, P. Peraluminous granites produced by rock-fluid interaction in the Ririwai non-organic Ring Complex, Nigeria: mineralogical evidence (in preparation). Martin, R. F. and Bowden, P. Alkali feldspars as monitors of postmagmatic changes, Ririwai Complex, Nigeria (in preparation). Masson-Smith, 1965, Geophysical prospecting for basaltcovered Cassiterite on the Jos Plateau, northern Nigeria, Overseas Geol. Surv. London, Geophys. Report Mills, 1974 1979 Moyes, 1979 Murthy, 1964, Petrogenetic significance of certain platform peralkaline granites of the world, 127 Newall, 1970, Mechanism of igneous intrusion Nicholis, 1969, Peralkaline and liquids: a petrological study, Contr. Miner. Petrol., 20, 268, 10.1007/BF00377480 Niewodniczanski, 1982, Application of X-ray fluorescence analysis for the determination of tin and related elements in Nigerian Younger Granite Complexes, 36 Ogbouji, 1982, Gravity survey of Shira Younger Granite Ring Complex of northern Nigeria, 66 Okezie, 1964, Discussion on Ring Structures in the Sara-Fier Younger Granite Complex, northern Nigeria, Q. Jl. geol. Soc. Lond., 120, 125, 10.1144/gsjgs.120.1.0125 Olade, 1978, Geochemistry of the Banke Ring Complex, northern Nigeria, petrogenetic and metallogenic implications, J. Min. Geol., 15, 97 Olade, 1978, Geochemical characteristics of tin-bearing and tin-barren Younger Granites, northern Nigeria, Econ. Geol., 75, 71, 10.2113/gsecongeo.75.1.71 Olarewaju, 1978, On the basement complex geology of 1:1000,000 Sheet 126, Ririwai, northern Nigeria, 65 Olatunji, 1982, Lithological variations in Banke in relation to mixed sulphide prospect, 50 Oyawoye, 1968, The geology of the Zarandah Ring Complex, Northern Nigeria, J. Min. Geol., 3, 33 Oyawoye, 1976, Petrology of the Dress Hill Ring substructure of the Rop Complex, African Geol., 2, 136 Oyawoye, 1978 Pastor, 1981, Ring complexes of northern Nigeria, and their metallogenic significance, Minoralia Slovaca, 13, 465 Raeburn, 1924, The tin fields of Nassarawa and Ilorin Provinces, Bull. Geol. Surv. Nigeria Raeburn, 1927, The tin fields of Zaria and Kano Provinces, Bull. Geol. Surv. Nigeria Raguin, 1976 Reyment, 1965 Rhodes, 1971, Structural geometry of subvolcanic Ring Complexes as related to pre-Cenozoic motions of the continental plates, Tectonophysics, 12, 111, 10.1016/0040-1951(71)90012-6 Rockingham, 1950, Notes on some primary mineralisation at Yeli and Kogo, Geol. Surv. Nigeria, Report No. 875 Rockingham, 1951, Preliminary report on a Lode near Kogo, Tibchi, Geol. Surv. Nigeria, Report No. 913 Sakoma, 1982 Schulling, 1967, Tin belts on the continents around the Atlantic Ocean, Econ. Geol., 62, 540, 10.2113/gsecongeo.62.4.540 Shaw, 1961, The use of the electrical resistivity method for prospecting deep leads in the Jos Plateau tin fields, Geol. Surv. Nigeria, 21 Shibayan, 1981 Smulikowski, 1980, Geology of Wamba-Nassarawa Eggon area (West part of Sheet 210), 113 Stavrakis-Hadzigeorgiou, 1975 1974, 1 Stemprok, 1974, Differentiation of some elements by ore-bearing granites, MAWAM, 3, 393 Stillitoe, 1974, Tin mineralization above mantle hot spots, Nature, Lond., 248, 497, 10.1038/248497a0 Tattam, 1941, Wolfram investigation. The Kalato-Kogo District (Tibchi and Yeli Hills), Geol. Surv. Nigeria Tauson, 1974, The geochemical types of granitoids and their potential ore capacity, 1, 221 Tella, 1980 Thorp, 1967, Closed basins in Younger Granite massifs, northern Nigeria, Z. Geomorph., 2, 459 Thorp, 1975, Geomorphic evolution in the Liruei Younger Granite Hills, Nigeria, Savanna, 4, 139 Torkaski, 1978, A post-granite rotational-transcurrent fault west of Delimi River at Jos, 100 Tugarinov, 1968, Age absolu et particularités génétiques des granites du Nigeria et du Cameroun. Septentnah, 119 Tugarinov, 1968, Distribution of Pb-isotopes Sn, Nb, Ta, Zr, and Hf, in granitoids from Nigeria, 30, 687 Turaki, 1982, Structural control of mineralisation in the Nigerian Younger Granite Complexes, 13 Turner, 1962 Turner, 1963, Ring structures in the Sara-Fier Complex, Northern Nigeria, Q. Jl. geol. Soc. Lond., 119, 345, 10.1144/gsjgs.119.1.0345 Turner, 1967, Structure of the Jos Plateau, Northern Nigeria Turner, 1968, Volcanic and intrusive structures in the Kila-Warji Ring Complex, northern Nigeria, Q. Jl. geol. Soc. Lond., 124, 81, 10.1144/gsjgs.124.1.0081 Turner, 1969, Correspondence on a gravity interpretation of the Liruei Ring Complex, Nigeria, Geol. Mag., 106, 95, 10.1017/S0016756800051773 Turner, 1971, A note on the occurrence of Trachytes in the Zaranda Ring Complex, J. Min. 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Lond., 130, 71, 10.1144/gsjgs.130.1.0071 Ugbaje, 1981, The lithology of the basement within and outside Kudaru Complex—A competitive study UNESCO, 1968 van Breeman, 1973, Sequential age trends for some Nigerian Mesozoic Granites, Nature Phys. Sci., 242, 9, 10.1038/physci242009a0 van Breeman, 1975, Age and origin of the Nigerian Mesozoic Granites: a RbSr study, Contr. Min. Petrol., 50, 157, 10.1007/BF00371037 Verheijen, 1979, Heatflow measurements in the Ririwai Ring Complex, Nigeria, Tectonophysics, 54, 27, 10.1016/0040-1951(79)90108-2 Verheijen, 1980, Geophysical exploration of the Ririwai Tin Lode: a case study, J. Min. Geol., 17, 55 Vidal, 1979, Strontium isotope geochemistry in Syenite—Alkaline Granite Complexes, 223 Webb, 1974, Roof modification of a high-level granite, Jos-Bukuru Younger Granite Ring Complex, Nigeria, Geol. Mag., 111, 43, 10.1017/S0016756800000431 Williams, 1923, Geology of the Liruei Hills, Min. Mag. Williams, 1957, Performance analysis of screens, hydrocyclones, jibs and tables used in recovering heavy minerals from an intensely decomposed granite on the Jos Plateau, Nigeria, Trans. Inst. Min. Metall., 67, 89 Williams, 1956, Economic geology of the decomposed columbite-bearing granites, Jos Plateau, Nigeria, Econ. Geol., 51, 303, 10.2113/gsecongeo.51.4.303 Wright, 1969, A simple alkalinity ratio and its application to questions of non-orogenic granite genesis, Geol. Mag., 106, 370, 10.1017/S0016756800058222 Wright, 1970, Comments on the origin of the Younger Granites of northern Nigeria by Bowden, Contr. Min. Petrol., 29, 89, 10.1007/BF00388001 Wright, 1970, Parent magmas of Nigerian Younger Granite, J. Min. Geol., 7, 89 Wright, 1971, Controls of mineralisation in the Younger and Older tin fields of Nigeria, Econ. Geol., 65, 945, 10.2113/gsecongeo.65.8.945 Wright, 1972, Parent magmas of Nigerian Younger Granites, Niger. J. Min. Geol., 7, 89 Wright, 1974, Tuffisite with topaz from the Nigerian Younger Granite Province—The Dalfour Hill ‘Sediments’, Geol. Mag., 111, 337, 10.1017/S0016756800038760 Wright, 1975, Anorthosite—First occurrence in Nigeria and relevance to the Younger Granites, Min. Mag., 40, 193, 10.1180/minmag.1975.040.310.08 Wright, 1972, The Ganawuri Overthrust—A case study from the Nigerian tin fields, Econ. Geol., 67, 249, 10.2113/gsecongeo.67.2.249 Almond, 1976, Concentrations of Younger Granite Ring Complexes and of small Cenozoic volcanic fields in the Bayuda District, Sudan Black, 1963, Note sur les complexes annulaires de Tchouni-Zarniski et de Goure (Niger), Bull. Bur. Rech. Geol. Min., 1, 31 Black, 1965, Sur la signification petrogenetique de la devouverte d'anorthosite associee aux complexes annulaires subvolcaniques du Niger, C. r. hebd. Séanc. Acad. 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