 | | Journal (article/letter/editorial) | | Petrology of combeite- and götzenite-bearing nephelinite at Nyiragongo, Virunga Volcanic Province in the East...online 23 April 2012 Keywords: Peralkaline rocks Nephelinite Combeite Götzenite Perovskite a b s t r a c...c t The lavas and pyroclastic rocks of Nyiragongo volcano (East African Rift) range in composition from...from olivine melilitite to nephelinite and minor alkali olivine basalt, and include rare examples of strongly...strongly peralkaline combeite nephelinite. In peralkaline nephelinites at Nyiragongo, titanium is hosted in |  | | Journal (article/letter/editorial) | | Kalsilite in the lavas of Mt. Nyiragongo (Belgian Congo) by TH. G. S AH AM A University of Helsinki,...part of the nephelinite lavas of the volcano Mt. Nyiragongo in the eastern Belgian Congo contains kalsilite...first stages of crystallization, some of the Nyiragongo lavas are able to precipitate small amounts of...represent the last extrusions emitted by the Nyiragongo main crater. The nepheline phenocrysts characteristic...potassium content than the nephelines found in other Nyiragongo flows. The crystals are slightly zoned with a |  | | Journal (article/letter/editorial) | | Kalsilite in the lavas of Mt. Nyiragongo (Belgian Congo) by TH. G. S AH AM A University of Helsinki,...part of the nephelinite lavas of the volcano Mt. Nyiragongo in the eastern Belgian Congo contains kalsilite...first stages of crystallization, some of the Nyiragongo lavas are able to precipitate small amounts of...represent the last extrusions emitted by the Nyiragongo main crater. The nepheline phenocrysts characteristic...potassium content than the nephelines found in other Nyiragongo flows. The crystals are slightly zoned with a |  | | Journal (article/letter/editorial) | | Aufs~itze Mineralogical composition of the Nyiragongo rod, s By TrL G. SArr~MA,Helsinki *) With 8 figures...figures and 2 tables Dedicated to Professor Dr. A. RITTMANNon the oeeasion of his 75. birthday Zusammenfassung...Gesteinsanalysen auf die Laven des Nyiragongo-Vulkans in Nord Kivu, Republik Congo (Kinsasha). In dem hetr. vulkanischen...Basanitgruppe (m~il3ig unters~ttigt) und das Nyiragongo-Gebiet mit Gesteinen der Leuzitit-NephelinitMelilitithgruppe...Al-reichen Titanklinopyroxen der Leuzitite und Nephelinite, ist derjenige der typischen Nephelin-Melilitithen |  | | Journal (article/letter/editorial) | | nepheline (melilite nephelinites) from the Nyiragongo volcano of the Congo and a group rich in olivine (olivine...range from 1100°C (the melilite nephelinite of the lava lake of Nyiragongo) through the Cameroons etindite...etindite (clinopyroxene nephelinite, 11IS0C) to 1300'C for the olivine nephelinites. For the most part the...includes a number of lavas of the Nyiragongo Crater area of the Congo and an etindite from the Cameroons...margin (FEAE 83). The lava of the lava lake of Nyiragongo crater carries nepheline phenocrysts with smaller |  | | Journal (article/letter/editorial) | | also for lava flows from one extensively sampled volcano. Hypotheses involving simple fractional crystallization...Birunga area at the junction of the Congo, south-west Uganda, and north-west Rwanda (see Fig. 1). The Birunga...Nyamlagira (Nyamuragira) and Nyiragongo in the Virunga province of the Congo. Most of the volcanoes in the...Nepheline-bearing varieties also are found. (2) Leucitite-Nephelinite Series: leucite+pyroxene, and nepheline+pyroxene...FIELD 2 - TORO-ANKOLE FELO 3 - SOUTH KIVU FIELD CONGO LAKE KIVU LAKE. TANSANYIKA\ INDIAN OCEAN FIG |  | | Journal (article/letter/editorial) | | delhayelite- and andremeyerite-bearing nephelinite from Nyiragongo volcano, East African Rift Tom Andersen a...Available online 7 August 2014 Keywords: Peralkaline nephelinite Combeite Götzenite Residual glass Halogen activity...Highly peralkaline leucite nephelinite from the active volcano Nyiragongo in the Virunga province of...mineral. Low-variance mineral assemblages in Nyiragongo nephelinite define a cooling trend from eruptive temperatures...East African Rift (Shombole, Oldoinyo Lengai, Nyiragongo). A number of rare minerals that are characteristic |  | Chakrabarti, Ramananda, Basu, Asish R., Santo, Alba P., Tedesco, Dario, Vaselli, Orlando (2009) Isotopic and geochemical evidence for a heterogeneous mantle plume origin of the Virunga volcanics, Western rift, East African Rift system. Chemical Geology, 259 (3) 273-289 doi:10.1016/j.chemgeo.2008.11.010 | Journal (article/letter/editorial) | | active Virunga volcanoes, Nyiragongo and Nyamuragira, are 15 km apart. Nyiragongo shows unusual compositions...major, trace elements and Nd–Sr–Pb isotopes in Nyiragongo and Nyamuragira lavas including samples from...from 2002, 2003 and 2004 eruptions. The youngest Nyiragongo lavas are ultrapotassic, ultrasodic and have...basanites and tephrites, distinct from the foiditic Nyiragongo lavas. Both volcanic products show enrichment...Dy/Yb suggests residual garnet in the source(s). Nyiragongo and Nyamuragira lavas show high Nb/U similar |  | | Journal (volume) | | Dietrich about ten years ago when Dr. William F. Foshag and Dr. George Switzer were kindly helping...locality ptygmatic features, was sent to the museum by Dr. J. J. Sederholm. The only location given was »southern...Bl'acksburg, Virginia, U.S. A . 1believe that most of Dr. Marmo's points are covered sufficiently in the original...described specimen was not, in my opinion, sent by Dr. Sederholrn to illustrate ptygmatic features. The...phenocryst in melite nephelinite lava. Mt. Kyiragongo (specimen VM 611), Congo. Magnificiltion 200 x |  | | Journal (volume) | | Dietrich about ten years ago when Dr. William F. Foshag and Dr. George Switzer were kindly helping...locality ptygmatic features, was sent to the museum by Dr. J. J. Sederholm. The only location given was »southern...Bl'acksburg, Virginia, U.S. A . 1believe that most of Dr. Marmo's points are covered sufficiently in the original...described specimen was not, in my opinion, sent by Dr. Sederholrn to illustrate ptygmatic features. The...phenocryst in melite nephelinite lava. Mt. Kyiragongo (specimen VM 611), Congo. Magnificiltion 200 x |  | | Journal (volume) | | the Volcanic Rocks of Mt. Nyira151 gongo (Eastern Congo) 8. TH. G. SAHAMA, Contact Microradiographic Distinction...Philippines Ojakangas, Richard, M. A., USA Dudek, Arnost, Dr., Czecho-Slovakia Clark, Alan, B. Sc., Great Britain...malmiesiintymistii. 40 Bulletin de la Commission g6ologiquc dr? Finlande N:o 196. Veikko Okko: Geologi-lehden ilmestymisen.... Lougee: Glacial Shoreline History in Eastern North America. A. Von Volborth: Vayryneniitistä. H. Stigzelius:...areas of molasse in Finland. Beginning from the north, the Kumpu formation has been thought to be a molasse |  | | Journal (volume) | | the Volcanic Rocks of Mt. Nyira151 gongo (Eastern Congo) 8. TH. G. SAHAMA, Contact Microradiographic Distinction...Philippines Ojakangas, Richard, M. A., USA Dudek, Arnost, Dr., Czecho-Slovakia Clark, Alan, B. Sc., Great Britain...malmiesiintymistii. 40 Bulletin de la Commission g6ologiquc dr? Finlande N:o 196. Veikko Okko: Geologi-lehden ilmestymisen.... Lougee: Glacial Shoreline History in Eastern North America. A. Von Volborth: Vayryneniitistä. H. Stigzelius:...areas of molasse in Finland. Beginning from the north, the Kumpu formation has been thought to be a molasse |  | | Book (volume) | | felspars we have been particularly fortunate in having Dr W. S. MacKenzie close at hand and are most grateful...nomenclatures we have been guided princip¬ ally by Dr. W. S. MacKenzie, whose assistance is gratefully...Bakersville, North Carolina (Emmons, 1953). Anal. R. E. Stevens. 9. Oligoclase, Hawk Mine, North Carolina... G. M. 11. Oligoclase, Hawk Mine, Bakersville, North Carolina (Kracek & Neuvonen, 1952). Anal. E. Chadbourn...cleavage mass of oligoclase, Hawk Mine, Bakersville, North Carolina (Tsuboi, 1923a). Anal. S. Tsuboi (full |  | | Book (edition) | | This book is respectfully dedicated to the memory of Dr. John Sinkankas for his kind initiative and support...by Strunz (1996). Thanks to the kind permission of Dr. E. Nagele from the E. Schweizerbart'sche Verlagsbuchhandlung...(mountains), R. (river), Is. (island), Vole. (volcano), Penin. (peninsula), St. (Saint), Ste. (Sainte)...arisen with localities in Congo-Zaire: the country, named Democratic Republic of Congo since 1960, was changed...The former Kivu province is now divided to three regions: INTRODUCTION Nord-Kivu, Sud-Kivu, and Maniema |  | | Book (edition) | | arm of the Red Sea known as Sharm Abhur, 30 km north of Jiddah, Saudi Arabia. SELECTED REFERENCE: Matzko...Butte counties, Idaho; at Gold Hill, Rowan County, North Carolina; at the Chantilly quarry, near Arcola,...Akagané mine, Iwate Prefecture, Japan; White Island volcano, New Zealand; near the Santo Nino mine, Santa Cruz...Vally, Italy; and in Precambrian dolomites in the Congo. 14 ALLACTITE SELECTED REFERENCE: Alietti, A...Massachusetts, Connecticut, New York, New Jersey, North Carolina, Virginia, and in ash beds of Miocene, | | | Book (edition) | | arm of the Red Sea known as Sharm Abhur, 30 km north of Jiddah, Saudi Arabia. SELECTED REFERENCE: Matzko...Butte counties, Idaho; at Gold Hill, Rowan County, North Carolina; at the Chantilly quarry, near Areola,...Akagane mine, Iwate Prefecture, Japan; White Island volcano, New Zealand; near the Santo Nifio mine, Santa...Vally, Italy; and in Precambrian dolomites in the Congo. 14 ALLACTITE SELECTED REFERENCE: Alietri ....~Iassachuserts. Connecticut. Ne,,· York, Ne\\· Jersey, North Carolina, \ 'irginia. and in ash beds of ~liocene |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Identification of Ore Minerals, 2nd ed., Elsevier-North Holland, New York, 1971. The word “opaque” may also...Asia 12. Middle East 13. African Countries, from north to south 14. Oceania 15. Australia 16. Antarctica...Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania...Yukon States, Australia New South Wales Northern Territory Queensland South Australia Tasmania Victoria Western...distance of 500 miles, from Nizhne Tagilsk in the north to Orsk in the south; in Siberia important placer |  | | Book (edition) | | Butte counties, Idaho; at Gold Hill, Rowan County, North Carolina; and at deposits in Mexico, France, and...Massachusetts, Connecticut, New York, New Jersey, North Carolina, Virginia, and in ash beds of Miocene,...other minerals near Bald Knob, Alleghany County, North Carolina; with tephroite and other manganese rninerals...Connecticut; as giant crystals at the Barton rnine, North Creek, New York , and at many other localities in...sulfides, and tellurides. Found in Gaston County, North Carolina; in s1nal1 amounts in many telluride-bearing |
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