 | | 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...extensive veins, consisting of amphibole, phlogopite, diopside, ilmenite, rutile, and sul®de. Preliminary investigations |  | 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) | | 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...Volatile-rich silicate melts from Oldoinyo Lengai volcano (Tanzania): implications for carbonatite genesis |  | | 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...a major sector collapse event over Lengai I. Petrography of Lengai II lavas show that nephelinite is combeite-...combeite- and wollastonite-bearing. All Oldoinyo Lengai lavas are peralkaline and highly evolved in terms |  | | 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...compositions occur in forsterite macrocrysts and in diopside, nepheline, fluorapatite, Ti-andradite, and Ti-magnetite...globule ± daughter/trapped phases, represented by diopside, fluorapatite, Ti-andradite, and alumoåkermanite)...bubble ± daughter phases) are rare in diopside and Ti-andradite. Diopside and forsterite have trails of secondary |  | | 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 |  | 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) | | 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...syenites from both occurrences correspond to the diopside-hedenbergite-aegirine solid-solution system, typical...Bearpaw (Chakhmouradian and Mitchell 1999), Ol Doinyo Lengai (Dawson 1998), P2-West Kimberlite (Kaur and |  | 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)...baddeleyite, Cal for calcite, Cb for carbonate, Di for diopside, Miner Deposita Fig. 1 Simplified geological |  | 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 (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 |  | 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: |  | | Journal (article/letter/editorial) | | JamesR.) Vanadinite.San Carlos (Levitt, S. R., et ol.) 9-10 1s62 Mineral data B-quartz solid solution...phaseequilibria (Morimoto, Nobuo, er a/.) 1-2 106 Diopside Experimentalstudies,phaseequilibria (Nafziger...lead ions, empty halide sites (Merker, Ludwig, et ol.) 7-8 1435 Germany, Ems, vibrationalspectra (Levitt...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 ...15 Phaseequilibria, diopside:iron oxide-silica, diopside-forsterite-iron oxide-silica (Nafziger, Ralph |  | | 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...projection from plagioclase on to the olivine-diopside-quartz plane showing how location of the basalt...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...dehydration reaction olivine + tremolite = enstatite + diopside + H2O Diagram showing how the Fe and Mg contents |  | | Book | | Al2Be3[Si6O18] Single chain: *pyroxenes, e.g. *diopside, CaMg[Si2O6] Double chain: *amphiboles, e.g. *tremolite...coccoliths. From plankton sample of the Kimberley region, Australia, kindly provided by CSIRO Tasmania (picture...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) | | “Granite” System 8.9.8 A Simple Ternary Basalt System: Diopside–Albite–Anorthite 8.9.9 More Complex Phase Diagrams...Sillimanite 14.5 Kyanite 14.6 Staurolite 14.7 Diopside 14.8 Anthophyllite 14.9 Cummingtonite–Grunerite...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 |  | | 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 | | 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 (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 | | 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) | | 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 | | ... ,~. fro ........ , ~= ,II ol<,,'!p>I_.......) .11 ~ ••, .. < mI'J< "'101 ~"K' """ ,'" ol<"~",""",'" _ ..."........ ~. _ ,"" """"'."'n ....,"" ..,.. .... 'Of""" '''''''.-1 ,,ol, ..... '''l! .. h .. """"", '" ,..-.:I><'"'~I) '...continental crust, it is useful to begin by defining the region under consideration and to provide some generalities...rocks may not be representative of their source region. These elements include the alkali and alkaline-earth |  | | Book | | position of 56Fe; and (iv) the abundance peaks in the region past iron at the neutron closed shell positions...mixing caused by the convection, the entire unstable region evolves essentially chemically homogeneously—replenishing...of burning region (central or shell burning) and depleting the fuel elsewhere in that region at the same...burning of this fuel then commences outside that region. Table 1 summarizes the burning stages and their...maximum temperatures that have been reached in each region in the preceding hydrostatic burning stages (Table |  | | Book (edition) | | Our earliest ancestors evolved in the volcanic region of the East African Rift, where their activities...sport of nature that humans evolved in a volcanic region, or was this African volcanic environment especially...is, if the mantle rock were brought upward to a region of shallower depth in the Earth. It was only with...middle region of opaque solid material (formerly liquid but now cooled); and an outermost region, the solid...Malesherbes made a journey through the Auvergne region, where they noticed some very unusual, black, and |
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