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A simple alkalinity ratio and its application to questions of non-orogenic granite genesis

Published online by Cambridge University Press:  01 May 2009

J.B. Wright
J.B. Wright
Affiliation:
Department of Geology, Ahmadu Bello University, Zaria, Republic of Nigeria.
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Summary

Commonly used variation diagrams do not convincingly distinguish strongly alkaline, alkaline and calc-alkaline rocks over the full range of silica contents, especially for more acid varieties. In particular, the Rittmann Suite Index, a, becomes invalid once SiO2 exceeds about 70%.

Type
Articles
Information
Geological Magazine , Volume 106 , Issue 4 , 27 August 1969 , pp. 370 - 384
Copyright
Copyright © Cambridge University Press 1969

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References

REFERENCES

Almond, D. C. 1967. Discovery of a tin-tungsten mineralization in Northern Khartoum Province, Sudan. Geol. Mag., 104, 1–12.CrossRefGoogle Scholar
Bailey, D. K. 1964. Crustal warping-a possible tectonic control of alkaline magmatism. J. geophys. Res., 69, 1103–11.CrossRefGoogle Scholar
Bailey, D. K., & Schairer, J. F. 1966. The system Na2O–Al2O3–Fe2O3–SiO2 at one atmosphere and the petrogenesis of alkaline rocks. J. Petrology, 7, 114–70.CrossRefGoogle Scholar
Bailey, E. B., Clough, C. T., Wright, W. B., Richey, J. E., & Wilson, G. V. 1924. The Tertiary and post-Tertiary geology of Mull, Loch Aline and Oban. Mem. geol. Survey. U.K.Google Scholar
Barth, T. F. W. 1962. Theoretical Petrology. (2nd Ed). Wiley, New York, London.Google Scholar
Belousov, V. V. 1966. Modern concepts of the structure and development of the earth's crust and the upper mantle of continents. Q. Jl geol. Soc. Lond., 122, 293–314.CrossRefGoogle Scholar
Black, M., Hill, M. N., Laughton, A. S. & Matthews, D. S. 1964. Three nonmagnetic seamountsoff the Iberian coast. Q. Jlgeol. Soc. Lond., 120, 477–518.CrossRefGoogle Scholar
Brown, G. M. 1963. Melting relations of Tertiary granitic rocks in Skye and Rhum. Miner. Mag., 33, 533–62.Google Scholar
Campbell Smith, W. 1956. A review of some problems of African carbonatites. Q. Jl geol. Soc. Lond., 112, 189–220.CrossRefGoogle Scholar
Carmichael, I. S. E. 1964. The petrology of Thingmuli, a Tertiary volcano in Eastern Iceland. J. Petrology, 5, 435–60.CrossRefGoogle Scholar
Cox, K. G., Johnson, R. L., Monkman, L. J., Stillman, C. J., Vail, J. R. & Wood, D. N. 1965. The geology of the Nuanetsi igneous province. Phil. Trans. R.Soc., Ser.A., 257, 71–218.Google Scholar
Cratchley, C. R. & Jones, G. P. 1965. An interpretation of the geology and gravity anomalies of the Benue Valley, Nigeria. Overseas geol. Surv. Geophys. Pap. no. 1.Google Scholar
Dunham, A. C. 1965. The nature and origin of the ground-mass textures in felsites and granophyres from Rhum, Inverness-shire. Geol. Mag., 102, 8–23.CrossRefGoogle Scholar
Emeleus, C. H. 1963. Structural and petrological observations on layered granites from South Greenland. Miner. Soc. Am. Spec. Pap., 1, 22–9.Google Scholar
Fitch, F. J. 1965. The structural unity of the reconstructed North Atlantic continent. Symposium on continental drift. Phil. Trans. R. Soc., Ser.A, 258, 191–3.Google Scholar
Fleischer, M. 1955. Hafnium content and hafnium-zirconium ratio in mineral and rocks. Bull U.S. geol Surv. 1021–A.Google Scholar
Gazel, J., Lasserre, M., Limasset, J.C., & Vachette, M. 1963. Ages absolus des massifs granitiques ultimes et de la mineralisation en étain du Cameroun central. C.R. Acad. Sci. Paris, 256, 2875–8.Google Scholar
Gibson, I. L. 1966. Crustal flexures and flood basalts. Tectonophysics, 3, 447–56.CrossRefGoogle Scholar
Greenwood, R. 1951. Younger intrusive rocks of Plateau Province, Nigeria, compared with thealkalic rocks of New England. Bull. geol. Soc. Am., 62, 1151–78.CrossRefGoogle Scholar
Harris, P. G. 1962. Increase of temperature in ascending basalt magma. Am. J. Sci., 260, 783–6.CrossRefGoogle Scholar
Healy, J. 1964. Volcanic mechanisms in the Taupo volcanic zone. N.Z.J. Geol. Geophys., 7, 6–23.CrossRefGoogle Scholar
Heinrich, E. Wm. 1966. The geology of carbonatites. Rand McNally, Chicago.Google Scholar
Jacobson, R. R. E., Macleod, W. B. & Black, R. 1958. Ring-complexes in the Younger Granite Province of Northern Nigeria. Mem. geol. Soc. Lond. No. 1.Google Scholar
Jacobson, R. R. E., Snelling, N. J. & Truswell, J. F. 1964. Age determinations in the geology of Nigeria, with special reference to the Older and Younger Granites, Overseas Geol. and Min. Res., 9, 168–82.Google Scholar
Kleeman, A. W. 1965. The origin of granitic magmas. J. geol. Soc. Aust., 12, 35–52.CrossRefGoogle Scholar
Luth, W. C, Jahns, R. H. & Tuttle, O. F. 1964. The granite system at pressures of 4 to 10 kilobars. J. geophys. Res., 69, 759–73.CrossRefGoogle Scholar
Mcconnell, R. B. 1967. The East African rift system. Nature, Lond., 215, 578–81.CrossRefGoogle Scholar
Macdonald, G. A. 1949. Hawaiian petrographic province. Bull. geol. Soc. Am., 60, 1541–95.CrossRefGoogle Scholar
Manton, W. I. 1968. The origin of associated basic and acid rocks in the Leboijibo- Nuanetsi igneous province, southern Africa, as implied by strontium isotopes. J. Petrology, 9, 23–39.CrossRefGoogle Scholar
Matos Ai.Ves, C. A. 1964. Estudo petrologico do macico eruptivo de. Sintra. Rev. Fac. Cienc. Lisboa, Ser.2(C), XII, 123–289.Google Scholar
Mohr, P. A. 1968. Transcurrent faulting in the Ethiopian Rift System. Nature, Lond., 218, 938–941.CrossRefGoogle Scholar
Moorbath, S., & Bell, J. D. 1965. Strontium isotope abundance studies and Rb—Sr age determinations on Tertiary igneous rocks from the Isle of Skye, northwest Scotland. J. Petrology, 6, 37–66.CrossRefGoogle Scholar
Murthy, M. V. N. & Ventakaraman, P. K. 1965. Petrogenetic significance of certain platform peralkaline granites of the world. I.U.G.S. Upper Mantle Symposium, New Delhi 1964. Report, p. 127–149 (Copenhagen).Google Scholar
Nockolds, S. R. 1954. Average chemical composition of some igneous rocks. Bull. geol. Soc. Am., 65, 1007–32.CrossRefGoogle Scholar
Okezie, C. N. 1964. Discussion of “Ring-structures in the Sara-Fier Younger Granite complex, Northern Nigeria” (by D. C. Turner). Q. Jl geol. Soc. Lond., 120 p. 125.Google Scholar
Oyawoye, M. O. 1964. Bauchite: a new variety in the quartz monzonite series. Nature, Lond., 205, 689.CrossRefGoogle Scholar
Rittmann, A. 1962. Volcanoes and their activity (Transl. by Vincent, E. A.). Wiley, New York/London.Google Scholar
Steiner, A. 1958. Petrogenetic implications of the 1954 Ngaurohoe lava and its xenoliths. N.Z.J. Geol. Geophys., 1, 325–63.CrossRefGoogle Scholar
Taylor, S. R. 1967. The origin and growth of continents. Tectonophysics, 4, 17–34.CrossRefGoogle Scholar
Thompson, A. O. & Dodson, R. G. 1963. Geology of the Naivasha area. Geol. Surv. Kenya, Rept No. 55.Google Scholar
Thompson, B. N., Kermode, L. O., & Ewart, A., (Edit.), 1965. New Zealand Volcanology, Central Volcanic Region. N.Z.D.S.I.R. Inform. Ser. 50.Google Scholar
Thornton, C. P. & Tuttle, O. F. 1960. Chemistry of igneous rocks. I. Differentiation Index. Am. J. Sci., 258, 664–84.CrossRefGoogle Scholar
Torre d'Assuncao, C. F., & Brak-Lamy, J. 1951. Rochas basálticas e doleriticas da Orla Ocidental do Macico antigo. Rev. Fac. Cienc. Lisboa, Ser 2(C), I, 307–36.Google Scholar
Torre d'Assuncao, C. F. 1952. Géologie et pétrographie du massif eruptif de Sintra (Portugal) Bol. Soc. geol. Portugal. 10, 23–57.Google Scholar
Truswell, J. F. & Cope, R. N. 1963. The geology of parts of Niger and Zaria provinces, Northern Nigeria. Bull. geol. Surv. Nigeria, No. 29.Google Scholar
Turner, F. J. & Verhoogen, J. 1960. Igneous and metamorphic petrology. (2nd Ed). McGraw Hill, London, New York.Google Scholar
Uchimizu, M. 1966. Geology and petrology of alkali rocks from Dogo, Oki Islands. J. Fac. Sci. Tokyo Univ. Sec., II, XVI, 85–159.Google Scholar
Upton, B. G. J. 1960. The alkaline igneous complex of Kûngnât Fjeld, South Greenland. Medd. Grønland. 123, no. 4.Google Scholar
Upton, B. G. J. 1962. Geology of Tugtutôq and neighbouring islands, South Greenland. I. Medd. Grønland, 169, no.8.Google Scholar
Upton, B. G. J. 1964. Geology of Tugtutoq and neighbouring islands, South Greenland. II–IV. Medd. Gønland, 169, nos. 2 & 3.Google Scholar
Wager, L. R., Vincent, E. A., Brown, G. M. & Bell, J. D. 1965. Marscoiteand related rocks of the Western Red Hills complex, Isle of Skye. Phil. Trans. R. Soc. Ser. A, 257, 273–307.Google Scholar
Watt, W. S. 1966. Chemical analyses from the Gardar igneous province, South Greenland. Geol. Surv. Greenland Rept no. 6.Google Scholar
Wilkinson, J. F. G. 1965. Some feldspars, nephelines and analcimes from the Square Top intrusion, Nundle, New South Wales. J. Petrology, 6, 420–44.CrossRefGoogle Scholar
Wilkinson, J. F. G., Vernon, R. H., & Shaw, S. E. 1964. The petrology of an adamelliteporphyrite from the New England bathylith (New South Wales). J Petrology, 5, 461–88.CrossRefGoogle Scholar
Wright, J. B. 1963. A note on possible differentiation trends in Tertiary to Recent lavas of Kenya. Geol. Mag., 100, 164–80.CrossRefGoogle Scholar
Wright, J. B. 1965. Petrographie sub-provinces in the Tertiary to Recent volcanics of Kenya. Geol. Mag., 102, 541–57.CrossRefGoogle Scholar
Wright, J. B. 1968. A re-interpretation of a mixed petrographie province-the Sintra intrusive complex (Portugal) and related rocks. Geol. Rdsch. 58 (2).CrossRefGoogle Scholar