 | | Journal (article/letter/editorial) | | han skriver at krystallene forekom âinvĂ€xta i en quartz-njuraâ. Det er iak a ĂŠgirinkrystaller som gĂ„r fra...Studies on the Igneous rock complex of the Oslo region. 20. Petrology and geochemistry of ekerite. Det...vulkan i Den Ăžstafrikanske riftdal â Ol Doinyo Lengai i Tanzania â et stort utbrudd, og her kunne forskerne...verdens eneste aktive karbonatittvulkan, Ol Doinyo Lengai i Tanzania. Utbrudd august 2002. Foto: Per BjĂžrn |  | | Journal (article/letter/editorial) | | [(Na,K,Cax)2âx(CO3)], known from Ol Doinyo Lengai volcano (Tanzania). A reïŹnement to the IUGS chemical...(<600°C) natrocarbonatitic lavas from Ol Doinyo Lengai, Tanzania that contain 38â40 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 |  | | Journal (article/letter/editorial) | | sulfides from natrocarbonatite lavas of Ol Doinyo Lengai, Tanzania (Mitchell 1997). X-ray studies could...phase relations that can be studied by annealing in quartz glass ampoules are limited to the ÂKFeS2âFeâS composition...sealed in evacuated (~ 10â2 Torr) quartz glass tubes. Sealed quartz ampoules were held in the furnace...found in the carbonate lavas of the Ol Doinyo Lengai volcano, Tanzania (Mitchell 1997), which compositions...neighborite and potassium iron sulphide in Oldoinyo lengai natrocarbonatite. Mineral Mag 61:779â789 Mrazek |  | | Journal (issue) | | GeoQuiz: The volcano in northern Tanzania known as Ol Doinyo Lengai, is probably the weirdest volcano...mound. At first, she thought it might just be a quartz crystal because of its elongated shape, but the |  | | Journal (article/letter/editorial) | | 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...the Ol Doinyo Lengai volcano belong to the highly alkaline car bonatite complexes of the region. Its...doubt about the origin of the soda waters of the region. Some investigators (21) suggest the existence...the orogenic basins of the Alpine-Himalayan fold region (Carpathians, Caucasus, Asia Minor uplands, Pamir |  | | Journal (article/letter/editorial) | | of Alferce Trachyte, Monte Velho, E. of Caldas Quartz trachyte, Monte Velho Nordmarkite, N. of Monchique...the typical Monchique pelite has 40% normative quartz and approximately 50% assimilation would transform...~1 u[ dombo Oka Iron Hill Magnet Cove Olffoinyo Lengai Range in c a r b b n a t i t e s 9 .701 --=...emplacement. However the Magnet Cove and O1 Doinyo Lengai carbonatites are small bodies of a single rock-...mantle-derived parent; (ii) both the Fen complex and O1 Doinyo Lengai exhibit ratios from 0.703 to 0.709 with an average |  | 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, silicateânatrocarbonatite 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 |  | 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) | | aragonite; Cal: calcite; MHC: monohydrocalcite; Q: quartz. ÎŽ18O and ÎŽ13C are expressed in â°PDB. TĂȘte de...monohydrocalcite; Phyl: phyllosilicates; Plg: plagioclase; Q: quartz; Str: strontianite; Tr: trona; Yuk: yukonite. Authors...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 |  | 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 |  | | Journal (issue) | | han skriver at krystallene forekom âinvĂ€xta i en quartz-njuraâ. Det er iak a ĂŠgirinkrystaller som gĂ„r fra...Studies on the Igneous rock complex of the Oslo region. 20. Petrology and geochemistry of ekerite. Det...vulkan i Den Ăžstafrikanske riftdal â Ol Doinyo Lengai i Tanzania â et stort utbrudd, og her kunne forskerne...verdens eneste aktive karbonatittvulkan, Ol Doinyo Lengai i Tanzania. Utbrudd august 2002. Foto: Per BjĂžrn |  | | Journal (article/letter/editorial) | | Vs is sparite fans and druses. Crossed nicols, quartz plate. Formation of secondary coarser granoblasts...travertines discovered in the Rukwa rift valley (Tanzania) not far from the Panda Hill carbonatite massif...massif, in immediate vicinity of Ol Doinyo-Lengai volcano that erupts carbonatite lavas, were characterized...at vents of CO2 hydrotherms in the Runkwa rift (Tanzania). Dokl. Akad. Nauk 363 (1), 89â92. Luchitsky,...N.A., 1961. Devonian travertines of the Kopâevo region (Minusa basin). Geologiya i Geofizika, No. 5, 80â82 |  | | Journal (article/letter/editorial) | | applicable Not applicable Not applicable Ol Doinyo Lengai, Tanzania Industrial source Kennack Sands, Cornwall...Kimmeridge Clay. H stretches in the 3050â2650 cm 1 region as a test for the presence of organic matter. Quantitative...resolution of 4 cm 1 in the 4000â 525 cm 1 infrared region; acquisition time was 39 s. Each analysis included...for: a strong sharp band in the 3700â3500 cm 1 region arising from the stretching vibration from mineral...the 3600â3200 cm 1 region for water of hydration and the 3400â3200 cm 1 region for adsorbed water; |  | | Journal (article/letter/editorial) | | commonly associated with barite, fluorite, hematite, quartz, strontianite and sulphidesâ. This third process...is located in the Saguenay region of QuĂ©bec, Canada (Figure 1). This region is comprised of three petrographic...hosting REE mineralization (Figure 4D). Halite, quartz, pyrite, apatite, Nb-rutile, and thorianite are...(B) Relic barite crystalsdissolution showing in quartz and calcite in a REE-fluorocarbonate matrix from...about 400 m; (C) A small halite dissolution in quartz and calcite in a REE-fluorocarbonate matrix from |  | | 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 |  | 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 phoscoriteâcarbonatite 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 (7.5Ă 9 km)...aegirine-augite, nepheline, andâsometimesârelict quartz. Minor minerals are richterite, titanite, hydroxylapatite |  | Wang, Zhen-Yu, Fan, Hong-Rui, Zhou, Lingli, Yang, Kui-Feng, She, Hai-Dong (2020) Carbonatite-Related REE Deposits: An Overview. Minerals, 10 (11) 965 doi:10.3390/min10110965 | Journal (article/letter/editorial) | | (Russia), and natrocarbonatite in the Ol Doinyo Lengai volcano (Tanzania) mainly consisting of Na-K-Ca carbonates...usually associated with calcite, barite, fluorite, quartz and other minerals to form major or net veins....The gangue minerals mainly comprise of fluorite, quartz, barite, calcite, apatite and aegirine-augite....Figure 3. Figure Fenitization in theinwallrock quartz from Bayan Obo REE-Nb-Fe 3. Typical Carbonatite-Related...calcite/dolomite carbonatite. fenite mainly consists Region [61,62]. The ore-forming is extremely complex, |  | | Book (edition) | | Agriculture. 15 AGRICULTURE AND LAND TENURE IN TANZANIA by A. HAMERSLEY, M.B.ÂŁ., B.SC.(AGRIC.) ; Agriculturalist...Chief Conservator of Forests. 18 FORESTRY IN TANZANIA by G. J. KILEO, 215 B.sc. Director of Forestry...rocks of the Mozambique Belt. 4a Olduvai Gorge, Tanzania. Pleistocene lake beds and Lemagrut Mountain,...with Pinus radiata in hill country near Mbeya, Tanzania. 6b Log of mahogany, Khaya anthotheca, Budongo...Dombeya rotundifolia in Combretum savannah, Thika District, Kenya. 8b Woodland. Typical miombo (Julbernardia-Brachystegia) |  | | 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. & Râ Tiercelin, Sedimentation...countriesâChad, EthÂŹ 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) | | Settlement. 177 15 AGRICULTURE AND LAND TENURE IN TANZANIA by A. HAMERSLEY, m.b.e., b.sc.(agric.) Agriculturalist...Conservator of Forests. 209 18 FORESTRY IN TANZANIA by G. J. KILEO, b.sc. Director of Forestry, Ministry...rocks of the Mozambique Belt. 4a Olduvai Gorge, Tanzania. Pleistocene lake beds and Lemagrut Mountain,...with Pinus radiata in hill country near Mbeya, Tanzania. 6b Log of mahogany, Khaya anthotheca, Budongo...Dombeya rotundifolia in Combretum savannah, Thika District, Kenya. 8b Woodland. Typical miombo (Isoberlinia-Brachystegia) |  | Neave, David A., Black, Martin, Riley, Teal R., Gibson, Sally A., Ferrier, Graham, Wall, Frances, Broom-Fendley, Sam (2016) On the Feasibility of Imaging Carbonatite-Hosted Rare Earth Element Deposits Using Remote Sensing. Economic Geology, 111 (3) 641-665 doi:10.2113/econgeo.111.3.641 | Journal (article/letter/editorial) | | Mountain Pass in the United States, Panda Hill in Tanzania, and Sokli in Finland were sourced from the Harker...parasite, Phl = phlogopite, Pyr = pyrochlore, Qz = quartz, St = strontianite 2 BM 1 Collection East and...monazite, Phl = phlogopite, Pyr = pyrochlore, Qz = quartz, and St = strontianite. 1965). While igneous rocks...al. (2009). Although the Panda Hill complex of Tanzania is a largely calciocarbonatitic in nature, magnesiocarbonatite...synchysite 2 BM 1 Collection Y Y Y Ank, Mag Tanzania Ap, Pyr Y Y Y Y Cal, Phl, Mag Cal, Bi, Mag |  | 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: |  | | 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) | | SUBJECTINDEX TO VOLUME 55 Gallium Field studies Quartz,mica, Nevada,Ontario,thermal activation energy...398 Shear,extension,fractures,pressure shadows,quartz (Burger,H. Robert,er a/.) 9-10 1791 Shock,scapolite...Vanadinite.San Carlos (Levitt, S. R., et ol.) 9-10 1s62 Mineral data B-quartz solid solution New mineral (Fleischer...1738 Composition, New HamPshire, west, Kinsman quartz monzonite, Mg/Fe partrtlonlng l'2 231 (Lyons, J...er a/.) l-2 43 Genesis,geochemistry, kaolinite,quartz (Gardner,LeonardRobert.) 7-8 1380 . Glaucophane |  | | Journal (article/letter/editorial) | | GEOLOGY WOLF UWE REIMOLD 11 Figure 5a. Ol Doinyo Lengai â the Mountain of God â a carbonatite volcano...the African Rift valley 120 km northwest of Arusha (Tanzania). This photograph shows the eruption of a...also that many countries in this worst-afflicted region are economically weak. In the context of global...(Figure 6 continued) Figure 6g. The north polar region (the area shown is 10 km wide) of asteroid Eros...(Figure 7j) and planar deformation features (PDFs) in quartz (Figures 7d and e) had been identified as inherent |  | 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 â 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 |
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