If you want to read more about the geology of Oldoinyo Lengai, here are some suggestions:

Bell, K. and Keller, J. (Eds.) Carbonatite Volcanism: Oldoinyo Lengai and the petrogenesis of natrocarbonatites. IAVCEI Proceedings in Volcanology 4. Berlin: Springer, 1995.

Bulletin of the Global Volcanism Network. Washington DC: Smithsonian Institution (many reports since 1983).

Church, A.A. and Jones, A.P. "Silicate-carbonate immiscibility at Oldoinyo Lengai". Journal of Petrology, v. 36, p. 869-889, 1995.

Dawson, J.B. "The geology of Oldoinyo Lengai". Bulletin Volcanologique, v. 24, p. 349-387, 1962.

Dawson, J.B., Bowden, P. and Clark, G.C. "Activity of the carbonatite volcano Oldoinyo Lengai, 1966". Geol. Rundschau, v. 57, p. 865-879, 1968.

Dawson, J.B., Pinkerton, H., Pyle, D.M. and Nyamweru, C. "June 1993 eruption of Oldoinyo Lengai, Tanzania: exceptionally viscous and large carbonatite lava flows and evidence for coexisting silicate and carbonate magmas". Geology, v. 22, p. 799-802, 1994.

Dawson, J.B., Keller, J. and Nyamweru, C. "Historic and recent eruptive activity of Oldoinyo Lengai" p. 4-22 in Bell, K. and Keller, J. (Eds.) Carbonatite Volcanism: Oldoinyo Lengai and the petrogenesis of natrocarbonatites. IAVCEI Proceedings in Volcanology 4. Berlin: Springer, 1995.

Kargel, J.S., Kirk, R.L., Fegley, B. and Treiman, A. "Carbonate-Sulfate volcanism on Venus?" Icarus, v. 112, p. 219-252, 1994.

Nyamweru, C. Bulletin of the Global Volcanism Network. Washington DC: Smithsonian Institution, v. 18 no. 7 (July 1993) and no. 8 (August 1993).

Nyamweru, C. "Changes in the crater of Oldoinyo Lengai: June 1993 - February 1997". Journal of African Earth Sciences, v. 25, p. 43-53, 1997.

Pinkerton, H., Norton, G.E., Dawson, J.B. and Pyle, D.M. "Field observations and measurements of the physical properties of Oldoinyo Lengai alkali carbonatite lavas, November 1988" p. 23-36 in Bell, K. and Keller, J. (Eds.) Carbonatite Volcanism: Oldoinyo Lengai and the petrogenesis of natrocarbonatites. IAVCEI Proceedings in Volcanology 4. Berlin: Springer, 1995.

Richard, J.J. "Oldoinyo Lengai - the 1940-41 eruption. Volcanological observations in East Africa". Jour. East Africa and Uganda Natural History Society, v. 16, p. 89-108, 1942.

Woolley, A.R. and Kempe, D.R.C. "Carbonatites: nomenclature, average chemical compositions, and element distribution" in K.Bell (ed.) Carbonatites: Genesis and Evolution. London: Unwin Hyman, 1989.

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