 | | 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...Besides the above minerals, these inclusions contain halite, sylvite, neighborite, Na–Ca-phosphate, alkali...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) | | [(Na,K,Cax)2–x(CO3)], known from Ol Doinyo Lengai volcano (Tanzania). A refinement to the IUGS chemical...(<600°C) natrocarbonatitic lavas from Ol Doinyo Lengai, Tanzania that contain 38–40 wt.% combined Na2O...Roberts 1984; Zaitsev et al. 2013); Kerimasi, Tanzania (Hay 1983; Zaitsev 2010; Guzmics et al. 2011);...alkali-bearing (moderately alkaline) melts. Recently, ‘halite intergrown with, and included in, dolomite, calcite... PARADIS 2010) to very recent (e.g. Ol Doinyo Lengai, Tanzania, which is considered an active volcano) |  | | Journal (article/letter/editorial) | | other salts. Their main paragenetic satellites are halite, mirabilite, thenardite, and borates. Part of the...directly from brines due to isothermic (trona and halite) or polythermic (natron and mirabilite) crystallization...day. Stratified deposits of trona and trona with halite (in all more than 40 layers with maximum thickness...problematical Lavas and ash from the Oldoinyo Lengai volcano, and volcanic exhalations of Etna, Vesuvius...and the carbonatite-soda formations of the 01 Doinyo Lengai volcano. The deposition of the lacustrine-continental |  | 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 |  | | Journal (article/letter/editorial) | | or barite crystals, as well as the presence of halite and silicification within strongly brecciated units...is located in the Saguenay region of Québec, Canada (Figure 1). This region is comprised of three petrographic...to preserve the highly soluble minerals, such as halite, present in these rocks. 3.2. Scanning Electron...clusters hosting REE mineralization (Figure 4D). Halite, quartz, pyrite, apatite, Nb-rutile, and thorianite...and/or brecciation. carbonate (Figure 5B,D) and halite (Figure 5C).carbonate, The solubility ofisbarite |  | | Report (chapter) | | contributed by runoff dissolving the trona-thermonatrite-halite efflorescent crusts coating the Pleistocene lake...saturated lake brines which normally do not reach halite saturation. Br, F, B and PO4 are also largely conserved...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 |  | | Journal (article/letter/editorial) | | Siderite Magnesium carbonate Sulfates and other salts Halite Iron(III) sulfate Gypsum Unaltered and altered...applicable Not applicable Not applicable Ol Doinyo Lengai, Tanzania Industrial source Kennack Sands, Cornwall...Kimmeridge Clay. H stretches in the 3050–2650 cm 1 region as a test for the presence of organic matter. Quantitative...sulfates and other salts to pyrolysis-FTIR we examined halite (NaCl), iron(III) sulfate (Fe 2 (SO 4 )3 ) and...resolution of 4 cm 1 in the 4000– 525 cm 1 infrared region; acquisition time was 39 s. Each analysis included |  | Teboul, P.-A., Durlet, C., Gaucher, E.C., Virgone, A., Girard, J.-P., Curie, J., Lopez, B., Camoin, G.F. (2016) Origins of elements building travertine and tufa: New perspectives provided by isotopic and geochemical tracers. Sedimentary Geology, 334. 97-114 doi:10.1016/j.sedgeo.2016.01.004 | Journal (article/letter/editorial) | | Chl: chlorite; Dol: dolomite; Gyp: gypsum; Hl: halite; K-fld: Potassic feldspars; Liz: lizardite; Mc:...Spring mound Pisarskii et al., 1998 Songwe river (Tanzania) Hypogean Carbonatite Modern Spring mound...the eclogite blocks from the Ligurian ophiolite region could explain the low barium content of Ponte Arma...alteration of Modern carbonatites from the Ol Doinyo Lengai volcano, Tanzania and from the carbonatites from the...enrichments in draining waters of the Ol Doinyo Lengai volcano in Tanzania. These enrichments are directly |  | | 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 |  | | Journal (article/letter/editorial) | | silicates (Albee, Arden L., et al.) 3-4 491 Properties Halite-sylvite,thermodynamicmodel, quasi-chemical (Green...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...Geochemistry, thermodynamic model, phaseequilibria,halite 9-10 1692 (Green,E. Jewett.) Synadelphite Composition...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 (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 |  | Huston, David L., Mernagh, Terrence P., Hagemann, Steffen G., Doublier, Michael P., Fiorentini, Marco, Champion, David C., Lynton Jaques, A., Czarnota, Karol, Cayley, Ross, Skirrow, Roger, Bastrakov, Evgeniy (2016) Tectono-metallogenic systems — The place of mineral systems within tectonic evolution, with an emphasis on Australian examples. Ore Geology Reviews, 76. 168-210 doi:10.1016/j.oregeorev.2015.09.005 | Journal (article/letter/editorial) | | 1910; Both and Williams, 1968: Fig. 2A). This district is zoned mineralogically relative to the ~360...pyrite- to siderite-dominated. The Bingham Canyon district in NU Utah, western USA is also strongly zoned...extinct carbonatite volcanos (e.g. Ol Doinyo Lengai in northern Tanzania: Hay, 1989), and Zn deposits (e...Hackett and Bischoff, 1973). Although the Ol Doinyo Lengai system is not known to contain significant...(Kelley et al., 2004) and deposits in the Gamsberg district in South Africa (Rozendaal et al., 1986; Ryan |  | | Book | | fossil bacterial cell was found in seafloor chert. ol Classification of fossils Once placed nto intoits...aero men 4 . A A have been found in 4 the Isua region of ieGreenland. Earth's oldest rocks s é These...radioactive Pee Mee CUA PRUE cd Ch ne ccm RR ol La Ug CER Peed TERTIARY Cry CRETACEOUS Archaeopteryx...layer, for example, is younger than ca RolaMi ee ol ole aR a Rela |e a If this sequence is cut by...em Leta Mae Re SCENE ella) eco) RN Le Meer) CUS ol es Gare aec le ues Mar hele tury URC) Pree Reece |  | | Journal (article/letter/editorial) | | analogous subaerial processes. Thus, we include halite formed by evaporation in a dry cave with other...to composition, is not known. Halides, notably halite (NaCl) and sylvite (KCl), must have formed on Earth’s...and Kjarsgaard 2008), whereas the Ol Doinyo Lengai volcano in Tanzania continues to erupt low-viscosity...Precambrian Aravalli phosphorite deposits of the Udaipur region, their environmental significance and genesis of |  | | Book | | OLpuvaAiI GoRGE AND LAETOLIL, GREGORY RIFT VALLEY TANZANIA; OLORGESAILIE, KENYA I51 10. MARY D, LEAKEY...WHITE. Fossil hominids from the Laetolil Beds, Tanzania 157 ROBERT M. SHACKLETON. Geological Map of...artifacts from the Kapthurin Formation, Baringo District, Kenya 337 361 C. Tue Laxe TurKANA (RupoLpH)... Cates ery — 7 ’ co) te | Ded uit Ai im, ol + ’ ai _ ie gta ve o* FT eee = = pre...It contains unique fossil localities in the Afar region of northern Ethiopia and the Omo valley in the |  | | Book | | evaporite salts. 22 Gypsum beds.□ 23 Halite beds (chevrons and crusts).26 Halite cumulates, rafts and coated grains...Lenticular mudcracks.42 Haloturbated and chaotic halite.43 Shallow mineralogic re-equilibration.43 Porosity...loss. 44 Deeper burial - mosaic halite?.45 Limpid dolomite in mosaic halite.46 Burial of sulphate evaporites...Evaporites as uplift indicators.51 Fibrous gypsum and halite (satinspar).52 Saline clay authigenesis 54 Textural...222 Carbonate salinas.223 Gypsum salinas .□ 227 Halite salinas. 230 Coastal salinas of the Middle East |  | | Book (edition) | | Magnesite 11.9 Siderite 11.10 Rhodochrosite 11.11 Halite 11.12 Sylvite 11.13 Gypsum 11.14 Anhydrite 11.15...hidden by a nebular disc of material (diagonal dark region) similar in mass and size to the one that formed...lower side by the 660 km seismic discontinuity. The region between this depth and another prominent discontinuity...capable of moving, albeit very slowly. In this region, heat can be transferred by moving hot low-density...triple junction may be present beneath the Afar region of Ethiopia, with the Red Sea and Gulf of Aden |  | | Book | | argentite (7 Sect. 5.1), galena (7 Sect. 5.2), halite, fluorite (7 Chap. 6), periclase, MgO, uraninite...Chemistry . Fig. 1.13 a X-ray powder photograph of halite NaCl. b X-ray powder diffractogram of α-quartz...electron density in the crystal structures of a halite NaCl, projection on the (100) plane, and b diamond...diamond C, projection on the (1̄10) plane. In the halite structure, there is no overlap between the electron...distance d2. In ideal ionic crystals, e.g., in halite NaCl, the cations (Na+) and anions (Cl–) form ideal |  | | Report (volume) | | Carbonatite lava flow from an eruption of Oldoinyo Lengai, Tanzania. Photo courtesy of Tobias Fischer. Series...more than 10,000 prospectors to the semi-desert region, and inevitably led to the recognition of diamond...Coal Mine 45, Kopeisk, Urals R3 Is River, Isovsky District, Urals C C I, To MCo CoF Pla I M M N, Ta Pla...Luobusha ophiolite complex, Autonomous Tibetan Region; (2) within the Mengyin kimberlite field, Linyi...three carbides that are unknown from any other region: qusongite (WC; Fang et al. 2009; Shi et al. 2009) |  | | Book | | differentiation 51 rocks Differentiation in wholly ol The diversity of magmatic liquid magmas Fractional...rocks 121 124 126 129 129 Contents Chapter 7 (ol Nad) General statement Textures and modal TS Geochemistry... Guttard studied the rocks of the Auvergne region of central France and recognized many recently...work (1894-1933) on the igneous rocks of the Oslo region of Norway; (b) the publication in 1895 of Alfred...uniquely able to provide substantial data about the region where they originated. The term primary magma should |  | | Book (volume) | | volume and quality of gemstones being mined in that region. As new localities are identified and new gemstones...localities or gemstones may lose their appeal or a region may become unproductive – so the market can be...mineral zoisite), which was discovered in 1967 in Tanzania and is now available through many retail outlets...of Afghanistan, the Sverdlovsk region of the Urals, and the Altai region of north-western China. Gems formed...sapphires (Mogok), Pakistan rubies (Hunza Mountains), Tanzania rubies (Morogoro), and Vietnam rubies (Luc Yen |  | | Book | | solids from a gas depend on temperature. In that region of the nebula occupied by the terrestrial planets...also have pushed ionized gases out of the inner region of the nebula. Again, there is a possibility that...up by this mass loss could have swept the inner region of the nebula clear of uncondensed gases. Planet...near the poles differs from that in the equatorial region. The succession of strata in the layered deposits...broadly correspond to terrestrial rocks in the region of the core/mantle boundary at 2900km (1800mi) |  | | 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 | | electrically neutral compounds when they join. The mineral halite, commonly used as table salt, forms in this way...natural evaporation of seawater is the mineral halite, but salt formed by evaporation of saltwater solutions...behind can come together to form crystals like the halite crystals in Figure 4B. Or, if too much of a substance...water evaporates, such as these white crystals of halite in Death Valley, California. Crystal Formation...when a saline lake or shallow sea evaporates and halite or gypsum forms. SECTION 1 Minerals 65 (inset)Patricia |
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