 | | Journal (article/letter/editorial) | | com/locate/lithos Peralkaline silicate lavas at Oldoinyo Lengai, Tanzania Jurgis Klaudius ⁎, Jörg Keller Institut für...June 2006 Abstract A detailed study of Oldoinyo Lengai has led to the recognition of two major cone-building...phonolitic stage, Lengai I, forms the southern cone. The recent nephelinitic Lengai II developed following...over Lengai I. Petrography of Lengai II lavas show that nephelinite is combeite- and wollastonite-bearing...wollastonite-bearing. All Oldoinyo Lengai lavas are peralkaline and highly evolved in terms of low Mg#, Ni and Cr values |  | | Journal (article/letter/editorial) | | carbonates in peridotite xenoliths from northeastern Tanzania Received: 30 July 1999 / Accepted: 5 February...xenoliths from the East African Rift in northeastern Tanzania occur as intergranular patches with accessory...located in the rift valley proper in northern Tanzania (Dawson and Smith 1988). These sites are near...near the well-known carbonatite volcanoes, Ol Doinyo Lengai and Kerimasai. The host lava for both Pello and...garnet-bearing lithologies, the lithosphere beneath this region probably extends no deeper than 90 km, consistent |  | Nabyl, Zineb, Massuyeau, Malcolm, Gaillard, Fabrice, Tuduri, Johann, Iacono-Marziano, Giada, Rogerie, Grégory, Le Trong, Emmanuel, Di Carlo, Ida, Melleton, Jérémie, Bailly, Laurent (2020) A window in the course of alkaline magma differentiation conducive to immiscible REE-rich carbonatites. Geochimica et Cosmochimica Acta, 282. 297-323 doi:10.1016/j.gca.2020.04.008 | Journal (article/letter/editorial) | | Fe2O3, FeO, MnO2, Mg(OH)2, CaCO3, Na2CO3, K2CO3, wollastonite, NaF, NaCl, SrCO3, SrF2, BaO, BaCO3, Nb2O5)...African Rift, including data from the Ol Doinyo Lengai volcano in Tanzania (De Moor et al., 2013), the most...Alkaline silicate rocks from the famous Ol Doinyo Lengai in Tanzania (grey arrow in Fig. 8a; data from De...0.70 to 1.0 ). The magmatic rocks from the Ol Doinyo Lengai volcano evolving toward strongly peralkaline...composition of natural natrocarbonatite from the Ol Doinyo Lengai volcano, which, at some magmatic stage, must |  | | Journal (article/letter/editorial) | | significance of natrocarbonatites at Oldoinyo Lengai, Tanzania: Composition of lavas from 1988 to 2007”☆...Available online 27 August 2012 Keywords: Oldoinyo Lengai Natrocarbonatite Average composition and compositional...Oldoinyo Lengai, Tanzania, are unique in magmatic petrology. The historical activity of Oldoinyo Lengai has...relationship to the silicate magmas of Oldoinyo Lengai. The “type” natrocarbonatite major and trace element...25 samples with low standard deviation. Oldoinyo Lengai carbonatites are unique in almost all aspects of |  | | Journal (article/letter/editorial) | | significance of natrocarbonatites at Oldoinyo Lengai, Tanzania: Composition of lavas from 1988 to 2007 J...Available online 1 June 2012 Keywords: Oldoinyo Lengai Natrocarbonatite Average composition and compositional...Oldoinyo Lengai, Tanzania, are unique in magmatic petrology. The historical activity of Oldoinyo Lengai has...relationship to the silicate magmas of Oldoinyo Lengai. The “type” natrocarbonatite major and trace element...25 samples with low standard deviation. Oldoinyo Lengai carbonatites are unique in almost all aspects of |  | | 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...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...the present, for example, Oldoinyo Lengai, which is located in Tanzania, ~16 km south of Lake Natron, near |  | | 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);... PARADIS 2010) to very recent (e.g. Ol Doinyo Lengai, Tanzania, which is considered an active volcano)... Carbonatites with mineralogy similar to Ol Doinyo Lengai natrocarbonatite may have been relatively |  | 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...primitive olivine melilitite to evolved combeite–wollastonite nephelinite, demonstrating their incompatible |  | | Report (issue) | | Oldonyo Lengai (Oldoinyo Lengai) Volcano and Surroundings, Arusha Region, United Republic of Tanzania By David...Oldonyo Lengai (Oldoinyo Lengai) and surroundings, Arusha Region, United Republic of Tanzania: U.S. Geological... . . . . . . . . . . . . 17 Oldonyo Lengai . . . . . . . . . . . . . . . ..... . . . . . . . . . 32 Age of Oldonyo Lengai . . . . . . . . . . . . . . . .... . . 32 Previously Published Ages from Oldonyo Lengai . . . . . . . . . . . . . . . |  | Jung, Seung Gi, Choi, Sung Hi, Ji, Kang Hyeun, Ryu, Jong-Sik, Lee, Der-Chuen (2019) Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: Implications for mantle source lithology. Lithos, 350. 105223 doi:10.1016/j.lithos.2019.105223 | Journal (article/letter/editorial) | | Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: Implications for mantle source lithology...Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: Implications for mantle source lithology...Geochemistry of volcanic rocks from Oldoinyo Lengai, Tanzania: 2 Implications for mantle source lithology...(S.H. Choi) 18 19 20 Abstract 21 22 Oldoinyo Lengai is the only active carbonatite volcano within the...the East African Rift Valley in 23 northern Tanzania. The volcano is dominated by peralkaline silicate |  | Mikhailova, Julia A., Kalashnikov, Andrey O., Sokharev, Victor A., Pakhomovsky, Yakov A., Konopleva, Nataly G., Yakovenchuk, Victor N., Bazai, Ayya V., Goryainov, Pavel M., Ivanyuk, Gregory Yu. (2016) 3D mineralogical mapping of the Kovdor phoscorite–carbonatite complex (Russia) Mineralium Deposita, 51 (1) 131-149 doi:10.1007/s00126-015-0594-z | Journal (article/letter/editorial) | | part of the Fennoscandinavian shield; Murmansk Region, Russia). We describe major intrusive and metasomatic...Sciences, 14 Fersman Street, Apatity, Murmansk Region 184209, Russia 2 Geological Institute of the...Murmansk Region 184209, Russia 3 JSC BKovdorskiy GOK^, 5 Sukhachova Street, Kovdor, Murmansk Region 184141...phlogopitite, fenite, etc.) in the southwestern Murmansk Region is an oval caldera-like depression (7.5× 9 km)...with massive, banded, or spotted structures. Wollastonite, pectolite, thomsonite-Ca, strontianite, and |  | | Journal (article/letter/editorial) | | 8] without generalizations and correlations. A region of widespread development of UIC plutons, uniquely...formation, is the western Anabar region (the Maymecha-Kotuy province). This region is on the northern margin...1. Geological sketch map of the western Anabar region: 1) Quaternary system; 2) Cretaceous system; 3)...Paleozoic sequence, widespread in the west of the region, are more than 1000 m thick. This sequence consists...sedimentary-volcanic cover of the western Anabar region: I) sedimentary sequence; II) volcanic sequence |  | | Journal (article/letter/editorial) | | Massif Central Sodalite-bearing phonolite Ol Doinyo Lengai Sadiman Nephelinite and Basanite Eifel Saghro...for major and volatile element analyses are: wollastonite for Si and Ca; Al2O3 for Al; TiO2 for Ti; forsterite...(2006) Peralkaline silicate lavas at Oldoinyo Lengai, Tanzania. Lithos, 91, 173–190. Laporte, D., Lambart...nephelinitic Sadiman volcano, Crater Highlands, Tanzania. Lithos, 152, 66–83. Manuscript received February |  | Fontijn, Karen, Elburg, Marlina A., Nikogosian, Igor K., van Bergen, Manfred J., Ernst, Gerald G.J. (2013) Petrology and geochemistry of Late Holocene felsic magmas from Rungwe volcano (Tanzania), with implications for trachytic Rungwe Pumice eruption dynamics. Lithos, 177. 34-53 doi:10.1016/j.lithos.2013.05.012 | Journal (article/letter/editorial) | | Late Holocene felsic magmas from Rungwe volcano (Tanzania), with implications for trachytic Rungwe Pumice...Available online 5 June 2013 Keywords: Rungwe Tanzania Alkaline magmas Trachyte Magmatic differentiation...eruptions a b s t r a c t Rungwe in southern Tanzania is an active volcanic centre in the East African...Democratic Republic of the Congo; carbonatitic Ol Doinyo Lengai, Tanzania; trachytic Longonot, Kenya) and calderas...Province is the southernmost volcanically active region in the EARS, and comprises three main central volcanoes: |  | | 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 |  | | Book | | coccoliths. From plankton sample of the Kimberley region, Australia, kindly provided by CSIRO Tasmania (picture...some artificial mineral fibres, such as fibrous wollastonite, applied in production of refractories, have...which the transport medium can move from the source region to the locus of ore precipitation; 5 an energy...crystal faces of the cube {100}. Kondjor, Chabarowsk district, Eastern Siberia, Russia hexagonal with 6/m2/m2/m...deposits of the Namib Desert and in the offshore region of Namibia. Many occurrences of diamond are known |  | | Book (edition) | | Tremolite–Ferroactinolite 14.11 Glaucophane 14.12 Wollastonite 14.13 Rhodonite 14.14 Talc 14.15 Chlorite 14...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 | | Resorbed crystal of quartz (Qz) in an olivinebearing (Ol) groundmass. The anhedral crystal shape and reaction...Compositions of basalt glasses from the Narrowgate region of the FAMOUS valley, Mid-Atlantic Ridge Geochemical...alkali basalts projected onto the normative Qz-Nph-Ol triangle Schematic cross-section of a typical island...at relatively high temperatures. a = stability region for sanidine, b = stability for orthoclase, c =...7/26/2013 8:35:06 AM 1.4 Igneous Textures Plag Ol anorthosite anorthosite 90 dunite 90 90 gabbro |  | | 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 |  | | 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 (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 (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 | | cone itself should be called Vesuvius: the wider region, including older volcanic remnants, should be called...second-century historian Florus as “the most beautiful region not only in Italy, but also in the world. Nothing...than the sea.” Times do change, of course, and the region has been swamped by undistinguished suburbs. But...kind of amphitheatrical appearance. However, this region, beautiful as it appears, is almost entirely uninhabited;...evidence for the forces that are lifting the whole region from the sea. The Solfatara crater lies just on |  | | Book (volume) | | Naddniprianshchyna (Ukraine) USE Central Dnieper Region (Ukraine) Nadeau family (Not Subd Geog) NADH, NADPH...Nan-ling District (China) USE Nan-ling Region (China) Nan-ling Region (China) UF Nan-ling District (China)...[Former heading] Nan-ling ti ch‘U (China) Nanling Region (China) Nan-ling Shan-mo (China) USE Nan Mountains...Mountains (China) Nan-ling ti ch‘U (China) USE Nan-ling Region (China) Nan Mountains (China) UF Nan Ling (China)...languages BT Kenya—Languages Nilo-Hamitic languages Tanzania—Languages Uganda—Languages NT Kalenjin language |  | | 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) |
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Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania