 | | Report (chapter) | | have resulted from later regional mapping by the Tanzania Geological Survey, together with radiometric dating...Extrusive basaltic centres. The term ‘peralkaline volcano’ is used here to indicate that the structure is...(unpublished) state that the oldest lavas from this volcano are melanephelinites and melilitites of the Bast...Bast Hills and Birera, to the west of the main volcano. These, as with early lavas from some other centres... Ngorongoro, Oldeani, Gelai, Ketumbeine, Tarosero, Monduli and the Shira and Mawenzi centres of Kilimanjaro) |  | Macdonald, R., Marshall, A. S., Dawson, J. B., Hinton, R. W., Hill, P. G. (2002) Chevkinite-group minerals from salic volcanic rocks of the East African Rift. Mineralogical Magazine, 66 (2) 287-299 doi:10.1180/0026461026620029 | Journal (article/letter/editorial) | | peralkaline quartz trachyte lava from the Tarosero volcano (Tanzania), both in the East African Rift Valley...are relatively enriched in Nb and the LREE; the Tarosero phase is more calcic and relatively Zrand Nb-rich...chevkinite-group, peralkaline rhyolites and trachytes, Kenya, Tanzania. Introduction FIVE members of the chevkinite-group...and in a quartz trachyte from the Tarosero volcano in northern Tanzania, aged between 1.9 and 2.4 Ma. As...the first report of a chevkinitegroup mineral in Tanzania and the second in Kenya, chevkinite having been |  | | Journal (article/letter/editorial) | | coarse-grained granite containing quartz, perthite, aegirine-augite, and Na- and Ca-amphiboles. The analysis...addition to Sr-rich perrierite from the north Baikal region (Portnov, 1964), which are intermediate between...determination of samples from the Burpala massif, Baikal region (Mirkina et al., 1973), the Eastern Ghats of India...trachyte lava chevkinite (unconfirmed), Tarosero volcano, Tanzania (this paper, Table 1); perrierite, rhyodacite...composition of perrierite from the Roccamonfina volcano in Italy can be adequately represented by the balancing |
|
