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Karroo basalts from western Zambia and geochemical provinces in central and southern Africa

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Zusammenfassung

Neue chemische Analysen mesozoischer Basalte von Zambia zeigen, da\ Tholeiite mit niedrigen Gehalten an K2O sowohl in Zentralals auch in Südafrika vorkommen. Die auf diese Weise ermittelte Verbreitung geochemischer Provinzen unterstützt die Ansicht, da\ der „Vulkanische Zyklus von Karroo“ durch den konvektiven Aufstieg von Mantelmaterial unter dem Gebiet von Nuanetsi Zimbabwes ausgelöst wurde.

Abstract

New chemical analyses of Mesozoic basalts from Zambia show that low K2O tholeiites are present in central as well as southern Africa. The distribution of geochemical provinces thus recognised supports the view that the “Karroo Volcanic Cycle” was initiated by the convective uprise of mantle material beneath the Nuanetsi area of Zimbabwe.

Résumé

De nouvelles analyses chimiques de basaltes mésozoÎques de Zambie indiquent que des tholéiites à teneur basse en K2O se présentent dans le centre aussi bien que dans le sud de l'Afrique. La distribution des provinces géochimiques ainsi reconnue confirme la théorie que »La Période Volcanique de Karoo« débuta par le soulèvement convectif du matériau du manteau sous la région de Nuanetsi en Zimbabwe.

кРАткОЕ сОДЕРжАНИЕ

пРИ ИсслЕДОВАНИИ МЕж ОжОИскИх БАжАльтОВ ж АМБИИ УстАНОВИлИ, ЧтО Их тОл ЕИИтОВыЕ лАВы, кОтОРыЕ ВстРЕЧА Утсь, кАк В цЕНтРАльНО И, тАк И В УжНОИ АФРИкЕ, сОДЕРжАт НЕБО льшИЕ кОлИЧЕстВА к2О. т. О. УстАНАВлИВАУтсь гЕО хИМИЧЕскИЕ пРОВИНцИИ, кОтОРыМ пР ЕДшЕВстВОВАлА ВУлкА НИЧЕскАь ДЕьтЕльНОсть кАРОО; Их МАтЕРИАл пРИ НЕсЕН Иж МАНтИИ кОНВЕ кцОННыМИ пОтОкАМИ.

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References

  • Appleton, J. D.: Petrogenesis of potassium rich lavas from the Roccamonfina Volcano, Roman Region, Italy. J. Petrology,13, 425–456, 1972.

    Google Scholar 

  • Cox, K. G.: Tectonics and volcanism of the Karroo period and their bearing on the postulated fragmentation of Gondwanaland, 1970. In African magmatism and tectonics (Eds.T. N. Clifford andI. G. Gass). Oliver and Boyd, Edinburgh.

    Google Scholar 

  • —: The Karroo volcanic cycle. J. geol. Soc. Lond.,128, 311–336, 1972.

    Google Scholar 

  • —,Johnson, R. L., Monkman, L. J., Stillman, C. J., Vail, J. R., &Wood, D. N.: The geology of the Nuanetsi Igneous Province. Phil. Trans. R. Soc, A,257, 71–218, 1965.

    Google Scholar 

  • — &Hornung, G.: The petrology of the Karroo basalts of Basutoland. Am. Miner.,51. 1414–1432, 1966.

    Google Scholar 

  • —,Macdonald, R. &Hornung, G.: Geochemical and petrographic provinces in the Karroo basalts of southern Africa. Am. Miner.,52, 1451–1474, 1967.

    Google Scholar 

  • — &Jamieson, B. G.: The Olivine-rich Lavas of Nuanetsi: a Study of Polybaric Magmatic Evolution. J. Petrology,15, 269–301, 1974.

    Google Scholar 

  • Jamieson, B. G., &Clarke, D. B.: Potassium and related elements in tholeiitic basalts. J. Petrology,11, 183–204, 1970.

    Google Scholar 

  • Manson, V.: Geochemistry of Basaltic Rocks: Major Elements. In Basalts: The Poldervaart Treatise on Rocks of Basaltic Composition (Eds.H. H. Hess andA. Poldervaart). Vol. 1. Interscience, Wiley, New York, 1967.

    Google Scholar 

  • Money, N. J.: An outline of the geology of Western Zambia. Recs. Geol. Surv. Zambia.12, 103–123, 1972.

    Google Scholar 

  • O'Hara, M. J.: The bearing of phase equilibria studies in synthetic and natural systems on the origin and evolution of basic and ultrabasic rocks. Earth-Sci. Rev.,4, 69–133. 1968.

    Google Scholar 

  • Rhodes, R. C., &Bornhorst, Th. J.: Petrologic Provinces in Jurassic Tholeiites of Gondwanaland. Geol. Jahrb.,65, 930–938, 1976.

    Google Scholar 

  • Vail, J. R., Hornung, G., &Cox, K. G.: Karroo basalts of the Tuli syncline, Rhodesia. Bull. volcan.,33, 398–418, 1969.

    Google Scholar 

  • Wilkinson, J. F. G.: The petrology of Basaltic Rocks. In Basalts: The Poldervaart Treatise on Rocks of Basaltic Composition (Eds.H. H. Hess andA. Poldervaart), Vol. 1. Interscience, Wiley, New York, 1967.

    Google Scholar 

  • Yorker, H. S. Jr., &Tilley, C. E.: Origin of basalt magmas: an experimental study of natural and synthetic rock systems. J. Petrology,3, 342–532, 1962.

    Google Scholar 

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Author notes

  1. John Ridgway

    Present address: Institute of Geological Sciences, NG 12 5 GG, Keyworth, Nottingham, UK

  2. N. J. Money

    Present address: Geological Survey of Zambia, PO Box RW. 135, Lusaka, Zambia

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    1. John Ridgway
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    2. N. J. Money
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    Additional information

    Occasional paper No. 75 Geological Survey of Zambia. Published by permission of the Director.

    Publishes with the approval of the Director, Institute of Geological Sciences (N.E.R.C.). U.K.

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    Ridgway, J., Money, N.J. Karroo basalts from western Zambia and geochemical provinces in central and southern Africa. Geol Rundsch 70, 868–873 (1981). https://doi.org/10.1007/BF01820167

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