 | | 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...matrix of microphenocrysts of olivine (Fo84), Ti-augite, Ti-magnetite, perovskite, intergranular nepheline...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 |  | | Report (chapter) | | Uganda; Songhor and Koru, Kenya; and Laetoli, Tanzania. Some, and perhaps most, of the carbonatite ash...carbonatite eruptions were from O1 Doinyo Lengai, in northern Tanzania (Fig. 1), which has discharged both... ~" ' ~" "~'" .,~ "~"'",~ Tanzania . 2o - .x" ~ . . Oldoinyo Lengai Olduvai G o r g e * ~ '~-~...carbonatite volcanic rocks of Kerimasi volcano in Tanzania (Hay 1983) and the Tinderet centre in Kenya (Deans...Gold 1973), and natrocarbonatite lava of Oldoinyo Lengai has 6180 of c. +7%0 (O'Neil & H a y 1973). Isotopic |  | | 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 |  | | Journal (article/letter/editorial) | | crystals, arfedsonite, rare chrome spinelid, garnet, augite, and pigeonite. Another remarkable feature of carbonatites... (7, 8) sodium carbonatites from Ol Doinyo Lengai Volcano, Tanzania: (7) unaltered carbonates from lavas...Lokhov, E. M. Prasolov, I. N. Kapitonov, et al., Region. Geologiya i Metallogeniya, No. 35, 56–71 (2008)...Mineralization of the Taimyr–Severnaya Zemlya Fold Region (NIIGA, Len ingrad, 1979), pp. 66–73 [in Russian]...Prasolov, K. I. Lokhov, E. A. Logvina, et al., Region. Geologiya i Metallogeniya, No. 28, 158–174 (2006) |  | | 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 . . . . . . . . . . . . . . . |  | Filina, Maria I., Aksenov, Sergey M., Sorokhtina, Natalia V., Chukanov, Nikita V., Kononkova, Natalia N., Belakovskiy, Dmitriy I., Britvin, Sergey N., Kogarko, Lia N., Chervonnyi, Alexandr D., Rastsvetaeva, Ramiza K. (2019) The new mineral fluorbarytolamprophyllite, (Ba,Sr,K)2[(Na,Fe2+)3TiF2][Ti2(Si2O7)2O2] and chemical evolution of lamprophyllite-group minerals in agpaitic syenites of the Kola Peninsula. Mineralogy and Petrology, 113 (4) 533-553 doi:10.1007/s00710-019-00664-0 | Journal (article/letter/editorial) | | rocks are potassium feldspar, Ti-rich aegirine-augite, aenigmatite, alkaline amphiboles, astrophyllite...Russian Academy of Sciences, Chernogolovka, Moscow region 142432, Russia 5 Fersman Mineralogical Museum...Oldoinyo Lengai volcano, Tanzania (Dawson 1998), alkaline basalts of the Eifel paleovolcanic region, Germany...and tectonophysical studies of the Kola-Karelian region, the Paleozoic carbonatite and alkaline massifs...potassium feldspar (25–30 vol.%), Ti-rich aegirine-augite (10–15 vol.%), aenigmatite (10–15 vol.%), amphiboles |  | 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)...fine-grained rock comprising albite, microcline, aegirine-augite, nepheline, and—sometimes—relict quartz. Minor |  | | Journal (article/letter/editorial) | | features in the visible to short-wave infrared region (VIS-SWIR), however, a significant knowledge gap...features in the visible to short-wave infrared region (VIS-SWIR) and have been conventionally viewed...reflectance spectra in the visible to shortwave infrared region of the main rare earth element fluorocarbonate...geological maps (e.g., Khanneshin, Mountain Pass, Ol Doynio Lengai). Remote sensing using the finer resolution...lanthanides and stopped short of the short-wave infrared region. The benchmark mineral spectroscopy paper of Hunt |  | | 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 |  | 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... quartz, barite, calcite, apatite and aegirine-augite. The hydrothermal fluids exsolved from the late...include Na- and K-amphiboles, Na-pyroxene, aegirine-augite, K-feldspar, albite, perthite, nepheline and pale...calcite/dolomite carbonatite. fenite mainly consists Region [61,62]. The ore-forming is extremely complex,...carbonatite, such as Oldoinyo Lengai sodic carbonatite in northern Tanzania [19,57,58]. However, carbonatites |  | | Journal (article/letter/editorial) | | 7-8 1396 Petrology,Germany,Weiselberg, pigeonite,augite hypersthene, (Nakamura,Yasuo,et a/.) 1l-12 1999...tt-12 2063 Calc-alkalic Composition,PuertoRico, augite, hornblende l-2 3O2 (Lidiak, Edward G.) Charnockite...Intrusive Composition, Labrador, Kiglapait intrusion, augite (Morse, S. A.) l-2 303 Kimberlite Composition,...Richard A., et al.) 3-4 358 Labrador Mineralogy Augite, Kiglapait intrusion (Morse, S. A.) 1-2 303 Laterites...Andesite, Germany, Weiselberg, hypersthene, pigeonite, augite (Nakamura, Yasuo, et a/.) ll-12 1999 Trace elements |  | | Journal (article/letter/editorial) | | Massif Central Sodalite-bearing phonolite Ol Doinyo Lengai Sadiman Nephelinite and Basanite Eifel Saghro...have not been detected (Table 2). Cpx are unzoned augite phenocrysts (200–800 μm, WoEnFs = 49:30:21; Mg#...(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: |  | | 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 | | 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 | | 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...Layering is based on modal variation of olivine, augite, and plagioclase. Photo by Michael Cheadle. (C)...at relatively high temperatures. a = stability region for sanidine, b = stability for orthoclase, c = |  | | 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 | | 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 | | discoveries, dated to 1.8 Ma at Olduvai Gorge in Tanzania. During these years, he was working for the Institut...African Early Acheulean of Peninj (Lake Natron, Tanzania) . . . . . 129 Fernando Diez-Martín, Policarpo...the TK Acheulean Site (Bed II, Olduvai Gorge, Tanzania): New Excavations 50 Years After Mary Leakey ...Dar es Salaam, P.O. Box 35050, Dar es Salaam, Tanzania Rita Melis Dipartimento di Scienze chimiche e...Acheulian occupation at Amanzi Springs, Uitenhage District, Cape Province. Annals of the Cape Provincial |  | | Book | | Economic Minerals . Fig. 2.6 Pyroxene (basaltic augite), big phenocryst in basalt; besides, a second much...coccoliths. From plankton sample of the Kimberley region, Australia, kindly provided by CSIRO Tasmania (picture...2 Volcanic rock: limburgite with phenocrysts of augite in a hyaline matrix. The rock contains a great...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 |  | | Book (edition) | | 10 Sodalite 7.11 Enstatite 7.12 Pigeonite 7.13 Augite 7.14 Aegirine 7.15 Hornblende 7.16 Muscovite 7...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 | | nearby city of Colima. The city and the surrounding region are rich in history and archeological remains....little-known Turrialba, located in an exceptionally scenic region. At this point a Caribbean detour is called for...well-known but equally interesting volcanoes in the region. Among them are three that share the name La Soufrière...lakes. Despite the dangers of travelling in the region, the long-term active lava lakes have attracted...volcanoes (Fig. 1.9). It extends from Ethiopia to Tanzania, crossing zones of major political unrest that |  | | 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 |
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