 | | Journal (article/letter/editorial) | | Peralkaline syenite autoliths from Kilombe volcano, Kenya Rift Valley: Evidence for subvolcanic interaction...geochemistry of syenite autoliths from Kilombe volcano indicate that they crystallized in the upper parts...These latter represent new mineral occurrences in Kenya. © 2006 Elsevier B.V. All rights reserved. Keywords:...Keywords: Syenite; Carbonatite; Kilombe; Kenya rift valley; Ce-anomaly; REE–fluorcarbonate ⁎ Corresponding...Lithos 91 (2006) 373–392 1. Introduction Within the Kenya Rift Valley, trachytes are important components |  | | | | February 2009, Vol. 73(1), pp. 1–16 The central Kenya peralkaline province: a unique assemblage of magmatic...peralkaline salic complexes in the south-central Kenya Rift Valley, stressing new developments of general...very low viscosity of the magmas. K EY WORDS : Kenya Rift, peralkaline salic rocks, petrogenesis, plumbing...plumbing systems. Introduction THE central Kenya peralkaline province (CKPP) of Macdonald and Scaillet...area of ~6000 km2 in the south-central part of the Kenya Rift Valley (Fig. 1). It is unique in its juxtaposition |  | Macdonald, R., Bagiński, B., Leat, P.T., White, J.C., Dzierżanowski, P. (2011) Mineral stability in peralkaline silicic rocks: Information from trachytes of the Menengai volcano, Kenya. Lithos, 125 (1) 553-568 doi:10.1016/j.lithos.2011.03.011 | Journal (article/letter/editorial) | | Information from trachytes of the Menengai volcano, Kenya R. Macdonald a,b,⁎, B. Bagiński a, P.T. Leat...Available online 17 March 2011 Keywords: Menengai volcano Peralkaline trachytes and rhyolites Mineral stability...silicaoversaturated trachytes from the Menengai volcano, Kenya Rift Valley. The dominant phenocryst assemblage...centres in the Kenya Rift Valley where pantelleritic trachytes have been recorded include Longonot (Rogers et...Barberi et al. (1975); Longonot, Kenya, unit Lt2b, Rogers et al. (2004); Olkaria, Kenya, Macdonald et al. |  | | Report (issue) | | 55 GOVERNMENT OF KENYA* MINISTRY OF COMMERCE AND INDUSTRY GEOLOGICAL SURVEY OF KENYA GEOLOGY OF THE...the Naivasha area, in the south-central part of Kenya Rift Valley, was probably the best known part of...Pleistocene exit the Njorowa Gorge, Mount Longonot a young volcano, and numerous other volcanic cones, is...accounted one of the more scenically beautiful parts of Kenya. Mr. Thompson and Mr. Dodson have succeeded in making...-The maximum extent of the Gamblian Lake between Longonot and Menengai .. .. .. .. .. .. .. .. .. 5 -Njorowa |  | MACDONALD, R., DAVIES, G. R., BLISS, C. M., LEAT, P. T., BAILEY, D. K., SMITH, R. L. (1987) Geochemistry of High-silica Peralkaline Rhyolites, Naivasha, Kenya Rift Valley. Journal of Petrology, 28 (6) 979-1008 doi:10.1093/petrology/28.6.979 | Journal (article/letter/editorial) | | of High-silica Peralkaline Rhyolites, Naivasha, Kenya Rift Valley by R. MACDONALD, 1 G. R. DAVIES, 2 C...15000 y) volcanic complex of southwest Naivasha, Kenya, consists of mildly peralkaline (comenditic) rhyolite...ayalite-titanomagnetite-ilmenite-riebeckite-arfvedsonite-aenigmatite-biotite-zircon. Ferrohedenbergite...peralkaline trachytes and pantelleritic rhyolites of the Kenya Rift Valley are mantle-derived. Various workers...Suswa volcanoes (Fig. 1) lies at the summit of the Kenya dome and contains a young, and easily accessible |  | Spandler, Carl, Morris, Caitlin (2016) Geology and genesis of the Toongi rare metal (Zr, Hf, Nb, Ta, Y and REE) deposit, NSW, Australia, and implications for rare metal mineralization in peralkaline igneous rocks. Contributions to Mineralogy and Petrology, 171 (12) doi:10.1007/s00410-016-1316-y | Journal (article/letter/editorial) | | titanomagnetite, usually with aegirine-augite and/or arfvedsonite (see Electronic Appendix 1) in the groundmass...of the trachytic matrix of the rock (Fig. 4). Arfvedsonite has not been identified, and rare fine-grained...pantellerite trachytes from the Menengai and Longonot volcanos, central Kenya (from Macdonald et al. 1970; Rogers...pantellerite trachytes of the Menengai and Longonot volcanoes of central Kenya (Macdonald et al. 1970; Rogers et...pantellerite trachyte magmas such as at Menengai and Longonot, Kenya. Nonetheless, the low TiO2 and CaO, high incompatible |  | | Report (issue) | | of peralkaline trachyte obsidians from central Kenya.__-.--___.__.__ 9. Coefficients of correlation for...three unpublished analyses of pantellerites from Kenya collected under the auspices of the East African...percent phenocrysts bility for one trachyte from Kenya (analysis 107), but by volume and none has >20 percent...the same minerals ± aegirine, riebeckite to arfvedsonite, biotite, and accessory minerals. Fayalite and...thirteen pantellerites with values <66 are from one volcano at Chabbi, Ethiopia (table 3, Nos. 69-79) (Macdonald |  | | Journal (article/letter/editorial) | | Evidence from peralkaline rocks (e.g. Azores, Kenya) indicate very short timescales of fractionation...eudialyte, sodalite, alkali feldspar, aegirine and arfvedsonite in various proportions as well as rare minerals...agpaitic rocks show enrichments in Na (nyböite, arfvedsonite) and contain elevated amounts of Li (up to 2500...(riebeckite). Our Na-dominated amphiboles (mainly arfvedsonite) have their first maximum of degassing at temperatures...U–230Th–226Ra disequilibria in trachyte lavas from Longonot volcano, Kenya. J. Petrol. 45, 1747 – 1776. T.V. Krumrei |  | | Report (volume) | | 273 BAKER, B. H. Outline of the petroIogy of the Kenya rift alkaline province 293 MACDONALD,R. Quaternary...peralkaline silicic rocks and caldera volcanoes of Kenya 313 WOOLLEY, A. R. & JONES, G. C. The petrochemistry...on the peralkaline silicic central volcanoes of Kenya and also favours an origin by crystal fractionation...pyroclastic deposits around central volcanoes in Kenya often show striking variations in the abundance...on the peralkaline silicic central volcanoes of Kenya and also favours an origin by crystal fractionation |  | | Book | | carbonatitic-alkaline province outcropping on the Kenya-Uganda border which have recently received significant...domain characterized East Africa from Madagascar and Kenya-Ethiopia to northeastern Sudan. It represents the...Popoff 1988a). Like the Atlantic Benue trough, the Kenya-Sudan Mesozoic trends could correspond to a failed...Segoufin and Patriat 1981; Mougenot et al. 1986). The Kenya-Sudan Mesozoic troughs hypothetized above could...East-African rift. This suggests that the Mesozoic NW-SE "Kenya-Sudan" rift-system has been reactivated, similarly |  | | Report (issue) | | metamorphosed hydrothermal system at Pine Canyon. Piute County, Utah. U.S.A. [abs.]: Mineralogical Society (London)...mineralogy of the Cerrillos copper deposit, Santa Fe County, New Mexico: New Mexico Geological Society Guidebook... E. E.. 1991. The igneous rocks of the Lincoln County porphyry belt, New Mexico: constraints on magma...geochemical and isotopic characteristics of the Lincoln County porphyry belt. New Mexico: implications for regional...the Sullivan Buttes Latite, Chino Valley, Yavapai County, Arizona, in Boyd, F. R., and Meyer, H. O. A., |
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