 | | Journal (article/letter/editorial) | | Evolution of the Nyiragongo Magma by TH. G. SAHAMA Department of Geology, University of Helsinki, Finland...5 June 1972) ABSTRACT INTRODUCTION T H E Lake Kivu volcanics in the Western Rift Valley of Central...the South Kivu basaltic rocks. On the other hand, the Virunga (Birunga) volcanic field north of the lake...Nyamuragira (Nyamlagira) and, especially, Mt. Nyiragongo (Niragongo, Niligongo), including their satellitic...lavas will be called the Nyamuragira area and the Nyiragongo area rocks, respectively. The six eastern extinct |  | Minissale, Silvia, Zanetti, Alberto, Tedesco, Dario, Morra, Vincenzo, Melluso, Leone (2019) The petrology and geochemistry of Nyiragongo lavas of 2002, 2016, 1977 and 2017 AD, and the trace element partitioning between melilitite glass and melilite, nepheline, leucite, clinopyroxene, apatite, olivine and Fe-Ti oxides: a unique scenario. Lithos, 332. 296-311 doi:10.1016/j.lithos.2019.02.023 | Journal (article/letter/editorial) | | com/locate/lithos The petrology and geochemistry of Nyiragongo lavas of 2002, 2016, 1977 and 2017 AD, and the...and melilite, nepheline, leucite, clinopyroxene, apatite, olivine and Fe-Ti oxides: a unique scenario Silvia...81100 Caserta, Italy d JOC, UN-MONUSCO, UN-Goma, Congo b a r t i c l e i n f o Article history: Received...2019 Available online xxxx a b s t r a c t The Nyiragongo lava of 2002, and the new one flowing from the...melilite, nepheline, leucite, clinopyroxene, olivine, apatite and magnetite, and are rich in fresh glass having |  | | Journal (article/letter/editorial) | | combeite- and götzenite-bearing nephelinite at Nyiragongo, Virunga Volcanic Province in the East African...a c t The lavas and pyroclastic rocks of Nyiragongo volcano (East African Rift) range in composition...combeite nephelinite. In peralkaline nephelinites at Nyiragongo, titanium is hosted in mineral assemblages with...götzenite-bearing melilite nephelinite from Nyiragongo, Democratic Republic of Congo (Sahama, 1961, 1978; Sahama and...and Hill, 1998). The melilite nephelinite from Nyiragongo has provided type material for the mineral species |  | | 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...Entstehung des hauptsiichlich melilitithischen Nyiragongo-Magmas mSglicherweise mit karbonatischen Anteilen |  | Chakrabarti, Ramananda, Sims, Kenneth W.W., Basu, Asish R., Reagan, Mark, Durieux, Jacques (2009) Timescales of magmatic processes and eruption ages of the Nyiragongo volcanics from 238U-230Th-226Ra-210Pb disequilibria. Earth and Planetary Science Letters, 288 (1) 149-157 doi:10.1016/j.epsl.2009.09.017 | Journal (article/letter/editorial) | | of magmatic processes and eruption ages of the Nyiragongo volcanics from 238U-230Th-226Ra-210Pb disequilibria...assessment a b s t r a c t The silica-undersaturated Nyiragongo volcanics, located in the East African Rift,...in 13 recent and prehistoric lava samples from Nyiragongo including those from the 2002 flank eruption and...consistent with high Zr/Hf in the Nyiragongo lavas. The Nyiragongo volcanics have higher (230Th/232Th)...carbonate metasomatism less than 300 ka ago. Several Nyiragongo samples display significant 226Ra excesses implying |  | | Report (issue) | | c = 7.085(1) X-ray Powder Pattern: Mt. Nyiragongo, Congo. 3.055 (100), 3.122 (80), 3.288 (60), 2.472...Total 100.91 100.00 34.44 36.75 (1) Mt. Nyiragongo, Congo; by electron microprobe. (2) BaFe2 Si2 O7...leucite, clinopyroxene, kirschsteinite, melilite, apatite, magnetite, gÄotzenite, troilite, glass. Distribution:...Distribution: From the rim of Mt. Nyiragongo volcano, Kivu Province, Congo (Zaire). Name: To honor Andr¶e...geologist with the Geological Survey of the Belgian Congo, who ¯rst collected the mineral. Type Material: |  | 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 (article/letter/editorial) | | and andremeyerite-bearing nephelinite from Nyiragongo volcano, East African Rift Tom Andersen a,⁎, Marlina...peralkaline leucite nephelinite from the active volcano Nyiragongo in the Virunga province of the East African...mineral. Low-variance mineral assemblages in Nyiragongo nephelinite define a cooling trend from eruptive...East African Rift (Shombole, Oldoinyo Lengai, Nyiragongo). A number of rare minerals that are characteristic...nephelinite from Nyiragongo in the Virunga volcanic province, Democratic Republic of Congo, including götzenite |  | Burgi, P.-Y., Minissale, S., Melluso, L., Mahinda, C. K., Cuoco, E., Tedesco, D. (2018) Models of the Formation of the 29 February 2016 New Spatter Cone Inside Mount Nyiragongo. Journal of Geophysical Research: Solid Earth, 123 (11) 9469-9485 doi:10.1029/2018jb015927 | Journal (article/letter/editorial) | | 29 February 2016 new spatter cone inside Mount Nyiragongo. Journal of Geophysical Research: Solid Earth...29 February 2016 New Spatter Cone Inside Mount Nyiragongo P.-Y. Burgi1 , S. Minissale2, L. Melluso2, C...Volcanologique de Goma, Goma, Democratic Republic of Congo, 4DISTABIF, Campania University-Luigi Vanvitelli...5JOC, UN-MONUSCO, Goma, Democratic Republic of Congo 3 Abstract A new and unusual eruptive event occurred...2016 within the summit crater of the Mount Nyiragongo volcano. Based on field campaigns performed between |  | | Journal (article/letter/editorial) | | principal minerals in the mode with subsidiary apatite and sphene. The mineralogy of their hydrothermally...perovskite, M: magnetite, Tm: titanomagnetite, Apat: apatite, Sph: sphene. titanomagnetite are the main phenocryst...phenocryst phases while perovskite, apatite and sphene are the principal and groundmass minerals (Table...nephelinites at Nyiragongo volcano (Demant et al., 1994; Platz et al., 2004) and at Kivu (Marcelot et al...nephelinites at Mt Etinde (Nkoumbou et al., 1995) and Nyiragongo (Platz et al., 2004) such as melilite nephelinites |  | | Journal (article/letter/editorial) | | 5% normative nepheline) are restricted to Kiejo volcano in the southern portion of the province. Rungwe...(Fo79–88); one basanite contains a 1 mm xenocryst of apatite included in magnesian clinopyroxene. All samples...source contains metasomatic amphibole, ilmenite, apatite, and zircon. The Rungwe suite is interpreted as...individual volcanoes, although lavas from each volcano reflect a range in degree of melting. Significantly...1): Toro-Ankole (Uganda), Virunga (Zaire-Rwanda), Kivu (Zaire-Burundi) and Rungwe (Tanzania). In these |  | | Journal (article/letter/editorial) | | with some alvikites and beforsites. Ca|d;.e and apatite from the s6vites and from the silico-s6vites show...Virunga) volcanic province (Fig. 1) is situated north of Lake Kivu. The most important and still active volcanoes...are Nyamuragira and Nyiragongo. According to Sahama (1973) the Nyiragongo volcano is mostly composed of...phonolitic to tephritic foidite. The Nyamuragira volcano shows tephritic to phonolitic rocks too. Sabordinated...basaltic rocks of ~outh Kivu is about 0.3. The volcanic activity in the South Kivu provirce began in Lower |  | | Journal (article/letter/editorial) | | nepheline (melilite nephelinites) from the Nyiragongo volcano of the Congo and a group rich in olivine (olivine...(the melilite nephelinite of the lava lake of Nyiragongo) through the Cameroons etindite (clinopyroxene...includes a number of lavas of the Nyiragongo Crater area of the Congo and an etindite from the Cameroons...of Nyiragongo crater carries nepheline phenocrysts with smaller phenocrysts of melilite, apatite and...is 1100°C-for the specimen of the lava lake of Nyiragongo. Sahama and Meyer (1958 p. 15) have recorded |  | | Journal (article/letter/editorial) | | is recorded in the western branch of the EARS at Kivu during this time. In contrast, the Early Rift Development...distinct from xenolith suites recovered further north. Lee lP and Rudnick (1999) established a compositionally... from which rifting has of propagated to the north and south during multiple periods in the past 20...Volcanic Province at ca. 17 Ma (Mesko et al., 2014) and Kivu ca. 20 Ma (Pouclet et al., 2016) is coincident with...while the border fault is thought to have formed in Kivu by ca. 10 Ma (Ebinger, 1989a). The formation of |  | | Journal (article/letter/editorial) | | CONTAMINATION IN THE POTASSIC SUITE OF THE KARISlMBI VOLCANO (VIRUNGA, AFRICAN RIFT VALLEY) M. DE M U L D E...contamination in the potassic suite of the Karisimbi Volcano (Virunga, African Rift Valley). In: S. Deutsch...silica-undersaturated volcanics from the Karisimbi volcano (Virunga region, Western African Rift Valley, Rwanda...MIKENOoO LK I MUHAVURA O O GAHING~/Z o NYIRAGONGO RWANDA LAKE KIVU EAST AFRIC~ -ORO-'A.KOL~-t RU~GA t\...African Rift System. Adjacent Toro-Ankole and South Kivu fields are also shown. 1983; Vollmer and Norry |  | | Journal (article/letter/editorial) | | 40.509–40.866) along with the data of Karisimbi volcano form trends on isotope diagrams towards the EM...part of Virunga, and Muhavura is the easternmost volcano of the province. Visoke, one of the eight main...summit crater lake (Fig.1). Visoke, along with Nyiragongo and Nyamuragira, are the only volcanoes that...(Bagdasaryan et al. 1973), while for the nearby Karisimbi volcano ages range from 30,000 to 120, 000 years (De Mulder...1992, 1998). However, the last eruption of Visoke volcano occurred in 1957, when two small adventive cones |  | | Journal (article/letter/editorial) | | mineral was discovered in Africa, in the Belgian Congo (now in them. Thus, it can be suggested that aluminum...calcilite-bearing melilite-nepheline lavas of the Nyiragongo Volcano as during gas synthesis. Later thermal reactions...of pentane. Later, after more than 25 years of apatite mining, gas in a distinctly shaped zone started...being very perfect SAHAMATH.J. Why is Mt. Nyiragongo a volcano of outstanding mineralogic along (010) and...a new silicate from Berlgia becomes light rose. Congo. Miner. Mag., 1959, v.32, N° 244, p. 6-9 On the |  | | Journal (article/letter/editorial) | | INTRODUCTION Esch (1901) described Mt Etinde as a volcano built (1983) and of Peterson (1989a, 19894). •Present...of Birmingham on May 30, 2015 Mt Etinde is a volcano situated on the southwestern flank of of leucitites...the following species: nosean, melilite, per- apatite and calcite. Other studies carried out on ovskite...lavas. ana upwards limit oi sconae <$"' Gabon : Congo Garnet leucite nephelinites Hauyne nephelinites...of Mt Etinde after Nkoumbou (1990) modified; (c) north-iouth cross-iection at 9°7'E; Kwele cliff limits |  | | Journal (issue) | | Type Mineralogy of the Democratic Republic of the Congo................................................... Hickox, Jr. Wally Mann Keith and Diane Brownlee Dr. Nikolas Golosow William B. (Bill) Wray Herb & Monika...Show” Sept. 30 - Okt. 02, 2022 Booth A5.p23 Apatite on Muscovite, 8.5 cm Nagar District, Pakistan ...COLLECTIONS OF Kurt Hefendehl Jack Halpern Dr. Gene Meieran Dr. Steve Smale Dr. Vasco Trancoso Bill and Anne Cook...Type Mineralogy of the Democratic Republic of the Congo Florias Mees Department of Geology Royal Museum |  | | Journal (article/letter/editorial) | | fine-grained leucite-melilite-nephelinite from the Nyiragongo volcano (Zaire). The melilite displays an exceptionally...vacuoles of some lavas of the ~Tyiragongo (Zaire) volcano melilite occurs in tiny crystals in which the exceptionally...types of leucite-melilitenephelinite lavas on Nyiragongo contain open cavities the walls of which are...melilite, olivine (kirschsteinite), magnetite and apatite. Crystals of prismatic habit have grown with their...to the cavity wall. Bundles of philipsite and apatite needles traverse the open space. Calcite is lacking |  | | Journal (article/letter/editorial) | | 0024-4937/90/$03.50 e.g. Mt. Cameroon, Cameroon; Mt. Nyiragongo, Zaire; Mt. Erebus, Antarctica. Mount Etna, Sicily...strongly alkaline magmatism is the active volcano Mount Nyiragongo (Zaire) which sustains a lava lake of...release through the magma column, so that the volcano is effectively a gas vent for the local continental...highly glassy) and the nephelinite glass from Nyiragongo. They are clearly not natural D K. BAILEY AND...Bailey, 1985) are produced by the nephelinite from Nyiragongo and this [60 6 5 D K BAILEY A.ND C M. HAMPTON |  | | Journal (article/letter/editorial) | | the mantle lithosphere. In their study of the volcano Karisimbi, De Mulder et al. (1986) and Rogers et...continental rift. It stretches from the Red Sea in the north to its southern extremities in Malawi and can be...Western Rift. However, even the most easterly volcano, Muhavura, has a very youthful morphology and appears...greater elevation. two currently active volcanoes, Nyiragongo and Nyamuragira; a contrast made all the more...<15 km. Nyamuragira is a more typical Virunga volcano erupting K-basanites and evolved derivatives such |  | | Journal (article/letter/editorial) | | effective subtraction of F-bearing amphibole and apatite in addition to anhydrous minerals. Introduction...hydrous minerals such as amphibole, mica, and apatite at relatively shallow levels of the upper mantle... we determined F in phlogopite, amphibole and apatite from various types of rocks derived from the upper...diopside, phlogopite, iron oxide, sanidine and apatite. The extremely high potassic basaltic rock, wyomingite...composed mainly of leucite, diopside, phlogopite, apatite, calcite and magnetite. Localities of the analyzed |  | Onuma, Naoki, Ninomiya, Shuji, Nagasawa, Hiroshi (1981) Mineral/groundmass partition coefficients for nepheline, melilite, clinopyroxene and perovskite in melilitenepheline basalt, Nyiragongo, Zaire. GEOCHEMICAL JOURNAL, 15 (4) 221-228 doi:10.2343/geochemj.15.221 | Journal (article/letter/editorial) | | nepheline, perovskite in melilite and basalt, Nyiragongo, Zaire NAOKIONUMA,*SHUJININOMIYA2 and HIROSHINAGASAWA3...structure basalt, control" for nepheline-, Nyiragongo volcano, mechanism. melilite and perovskite, values...University of Tokyo, from the central crater of Nyiragongo volcano, Zaire. Micro scopic investigation by M....specimen contains nepheline, melilite, perovskite, apatite and opaque minerals as phenocrysts of mm size within...University of Tokyo for giving us the valuable sample, Dr. M. TORIUMI of Ehime University and Drs. D. P. BLAN |  | Raghuvanshi, Sneha, Pandey, Ashutosh, Pankaj, Praveer, Rao, N.V. Chalapathi, Chakrabarti, Ramananda, Pandit, Dinesh, Pandey, Rohit (2019) Lithosphere-asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India. Geological Journal, 54 (5) 3060-3077 doi:10.1002/gj.3468 | Journal (article/letter/editorial) | | Mesoproterozoic diamondiferous kimberlites from direction in north to N–S in the south (Chadwick, Vasudev, & Hegde...of dark mica (60–70%) with feldspars, sphene, apatite, carbonates, and zircon restricted to the groundmass...of Geology, dark brown to green. Inclusions of apatite in mica (Figure 2a,b) imply Centre of Advanced...LEICA‐EM ACE200 rise to the resorption texture. Apatite is present as a major accessory instrument. The...Activation laboratories, Ancaster, Canada. Apatite and sphene: Apatite and sphene are present as groundmass |
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