Effusive natrocarbonatite activity of Oldoinyo Lengai, June 1988
@article{Keller1990EffusiveNA, title={Effusive natrocarbonatite activity of Oldoinyo Lengai, June 1988}, author={J{\"o}rg Keller and Maurice Krafft}, journal={Bulletin of Volcanology}, year={1990}, volume={52}, pages={629-645} }
Oldoinyo Lengai in the Tanzanian rift valley is the only active carbonatite volcano in the world and its natrocarbonatitic lavas are unique in composition. The characteristics of effusive natrocarbonatite activity in June 1988 were studied and fresh samples were directly collected from active carbonatitic lava lakes and flows. Analyses of these samples provide the first information on natrocarbonatites since these unusual volcanic rock type was first described from the 1960–1961 eruptions. The…
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References
SHOWING 1-10 OF 27 REFERENCES
Altered former alkalic carbonatite lava from Oldoinyo Lengai, Tanzania: Inferences for calcite carbonatite lavas
- Geology
- 1987
The active volcano Oldoinyo Lengai, Tanzania, is well known for its extrusions of alkalic carbonatite lava, first witnessed in 1960. An older carbonatite flow from the volcano was originally also…
Temperature Measurements in Carbonatite Lava Lakes and Flows from Oldoinyo Lengai, Tanzania
- GeologyScience
- 1989
The petrogenesis of carbonatites has important implications for mantle processes and for the magmatic evolution of mantle melts rich in carbon dioxide, and unusually low magmatic temperatures were confirmed with 1-atmosphere melting experiments on natural samples.
Peralkaline nephelinites
- Geology
- 1989
Two fractionation trends in sodic alkaline ultramafic liquids have been predicted from experiments in subsystems of the join Di-Ak-Ne-Lc-Qz. The products of these trends are equated with contrasting…
Peralkaline nephelinites. I. Comparative petrology of Shombole and Oldoinyo L'engai, East Africa
- Geology
- 1989
Shombole, a nephelinite-carbonatite volcano in south Kenya, erupted silicate lavas, carbonatite dikes and tuffs, and pyroclastic rocks similar to those at other East African alkaline centres.…
Carbonatite tuffs and lava clasts of the Tinderet foothills, western Kenya: a study of calcified natrocarbonatites
- GeologyJournal of the Geological Society
- 1984
Miocene 'limestones' around Tinderet, noted for their mammalian fossils, but recognized as in part carbonatitic, are now shown to be carbonatite tuffs and volcaniclastics. They contain ejectamenta of…
An experimental determination of primary carbonatite magma composition
- GeologyNature
- 1988
Carbonatites are uncommon carbonate-rich rocks usually found in continental intra-plate regions and often associated with rifting. There has been much debate as to whether carbonatite magmas are…
The role of liquid immiscibility in the genesis of carbonatites — An experimental study
- Geology
- 1980
AbstractThe two-liquid field between alkali-carbonate liquids and phonolite or nephelinite magmas from the Oldoinyo Lengai volcano has been determined between 0.7 and 7.6 kb and 900°–1,250° C. The…
Physicochemical properties of alkali carbonatite lavas:Data from the 1988 eruption of Oldoinyo Lengai, Tanzania
- Geology
- 1990
Alkali carbonatite lavas extruded from Oldoinyo Lengai, Tanzania, in November 1988 are similar in composition to lavas extruded in 1960. Extrusion temperatures are 585 ±10 °C. Apparent viscosities in…