 | Pekov, I. V., Zubkova, N. V., Chukanov, N. V., Sharygin, V. V., Pushcharovsky, D. Yu. (2009) Crystal chemistry of delhayelite and hydrodelhayelite. Doklady Earth Sciences, 428 (1) 1216-1221 doi:10.1134/s1028334x09070393 | Journal (article/letter/editorial) | | samples from alkaline lavas of the Ol Doinyo Len gai volcano in Tanzania is the content of Si increased...we made, like in the delhayelite from the Ol Doinyo Lengai vol cano, is close to four atoms per formula... lamprophyllite, lomo nosovite, fenaksite, villiaumite, etc. The 3D set of diffraction reflections was...10—Khibiny massif, Kola Peninsula; 8, 9—Ol Doinyo Lengai, Tanzania; 11—Bultfontein, South Africa. References: |  | | Journal (article/letter/editorial) | | forsterite–phlogopite ijolites at Oldoinyo Lengai Volcano, Tanzania: study of melt inclusions V.S. Sekisova...inclusions in minerals of ijolite xenoliths at Oldoinyo Lengai Volcano. Melt inclusions with different phase compositions...gregoryite, thenardite, witherite, fluorite, villiaumite, and other phases. Their mineral composition...ijolite; nyerereite; natrocarbonatite; Oldoinyo Lengai Introduction The East African Rift System, expanding...the Gulf of Aden through Ethiopia, Kenya, and Tanzania, is divided into two large tectonic zones: Western |  | | Journal (article/letter/editorial) | | concentrations of fluorine. For example, in the Ol Doinyo Lengai volcano, the fluorine content in the effusives...Natron, Magadi, and Katuz); at Lake Magadi, villiaumite (NaF) is present in association with trona and...Miocene, and in places (the Mojave Desert, the region of Borax and Clear Lakes in the Coast Ranges, etc...1974). Simultaneously, in the southeast of the region ( Rio Grande Basin), Downloaded by [University...PROBLEM OF ORIGIN OF SALT DEPOSITS NEAR LAKE NATRON (TANZANIA): AN SSSR Izvestiya, s e r . g e o L , no. 4, |  | Mangler, Martin F., Marks, Michael A.W., Zaitzev, Anatoly N., Eby, G. Nelson, Markl, Gregor (2014) Halogens (F, Cl and Br) at Oldoinyo Lengai volcano (Tanzania): Effects of magmatic differentiation, silicate–natrocarbonatite melt separation and surface alteration of natrocarbonatite. Chemical Geology, 365. 43-53 doi:10.1016/j.chemgeo.2013.11.027 | Journal (article/letter/editorial) | | com/locate/chemgeo Halogens (F, Cl and Br) at Oldoinyo Lengai volcano (Tanzania): Effects of magmatic differentiation...Natrocarbonatite Halogen fractionation Bromine TXRF Oldoinyo Lengai Leaching a b s t r a c t Halogen abundances of...and their alteration products from Oldoinyo Lengai (Tanzania) are compared to those of associated silicate...alteration. In the associated silicate rocks at Oldoinyo Lengai concentrations of all three halogens increase from...abundances in natrocarbonatites from Oldoinyo Lengai volcano (Tanzania) and the associated silicate rocks in |  | | Report (chapter) | | contain over 2000 ppm, and precipitation of villiaumite, NaF, has been reported. Such enrichment causes...is the natrocarbonatite ash observed from Ol Doinyo Lengai: 'The trona evaporites of Lakes Magadi and...June 30, 2015 Lake Magadi, Kenya active O1 Doinyo Lengai volcano.' (Baker, this volume). Ash contributed...229) that the natrocarbonatite lava and ash of Lengai are due to the interaction of the alkaline silicate...in the sedimentary deposits of the Lake Magadi region, Kenya. Bull. Geol. Soc. Am. 87, 1739-52. - - & |  | | Report (issue) | | were that part of the Rift Valley not a volcanic region, it is unlikely that the deposits would have accumulated...(a) Olorgesailie Volcanic Series (b) Shanamu (2) Ol Keju Nero Basalts (3) Kirikiti Basalts (4) Lengitoto...sediment (5) The Plateau Trachyte Series (6) Ol Doinyo Nyegi Volcanics (7) Ash and scoriaceous lava vents...through Ol Doinyo Nyegi hill Fig. 5.- -Section in a stream one mile south-west of Ol Doinyo Nyegi Fig...area was formerly in the Masai Extra-Provincial District but is now in Southern Province, that part east |  | | Journal (article/letter/editorial) | | Paul D., et c/.) 9-10 l54l Guinea Mineralogy Villiaumite,Islesde Los (Stormer,J. C., Jr., et al.\ l-2...JamesR.) Vanadinite.San Carlos (Levitt, S. R., et ol.) 9-10 1s62 Mineral data B-quartz solid solution...lead ions, empty halide sites (Merker, Ludwig, et ol.) 7-8 1435 Germany, Ems, vibrationalspectra (Levitt...high pressure (Cifrulak,S. David.) 5-6815 Villiaumite General, New Mexico, Colfax county, Guinea, lsles...California,Inyo county, Death Valley (Erd, Richard C , et ol.\ 3-4 349 Welinite New data ( F l e i s c h e r |  | | Report (volume) | | Chad, Ethiopia, Kenya, Malawi, Nigeria, Sudan, Tanzania and Uganda. However, in the last few years there...Depth to metamorphic basement in the Koobi Fora region from seismic and gravity data. 75 Watkins, R.T...record of Pleistocene deposits, Lake Natron basin, Tanzania... Bonnefille, G. & R„ Tiercelin, Sedimentation...countries—Chad, Eth¬ iopia, Kenya, Malawi, Nigeria, Sudan, Tanzania and Uganda. Geographical representation is very...waterfall dams and in rivers. There is thus no region of the world to match African lakes for the study |  | | Book (edition) | | within the city limits, but also to the surrounding region. In this edition of the Thesaurus, names of cities...newly added are followed by the word “region”; e.g., Stripa region. Names of materials, when used as GeoRef... isochrons isotopes SA SA Abruzzi Autonomous region on the Adriatic Sea. CO N414000N425500 E0144800E0130000...Islands Adalia use Antalya Adamawa Administrative region in N. BT Cameroon adamellite As of 1981, includes...changed from Greece to Mediterranean region. BT Mediterranean region SA Greek Aegean Islands Between Greece |  | | Book (edition) | | the city limits, but also to the sur¬ rounding region. Terms for materials in GeoRef, for example, "iron...Aberfeldy Term introduced in 1989. Town and mining region in Tayside, central Scotland; oil field in Lloydminster...in GeoRef (see Introduction, p. vi). Autonomous region on the Adriatic Sea. CO N414000N425500 E0144800E0130000...SA Aleutian Islands Adalia use Antalya Adamawa Region in W Africa, now part of N central Cameroon and...BA Proterozoic BT Precambrian Adrar Interior region in W Mauritania near Western Sahara border. BT |  | | Book | | regions. Five Islands, Gulf of Mexico. Zagros/Hormuz region, Arabian (Persian) Gulf Salt Dissolution: Solution...Stromatolite Lakes *b/% Mg 300 ppm 18°C in the Coorong region of South Na 200 ppm -j q " Australia (Figure 4...basins, such as the Messinian of the Mediterranean region. In¬ stead, the isopachous precipitative facies...accessed 11 Dec, 2004 for more details on this region of New Mexico). Logan, 1987; Kendall, 1989; Smoot...reworked shoal water crystals, typifies the subaqueous region separating the shallow from the basinal (Chapter |
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