 | | Journal (article/letter/editorial) | | Clinopyroxene from some felsic alkaline rocks of the Cameroon Line, central Africa: petrological implications...rocks belonging to the continental part of the Cameroon Line (CL). The investigated samples include both...amphiboles plot. In the kaersutite-bearing peralkaline phonolite of Nganha volcano, however, pyroxenes are...distinct pyroxene trends in trachytes from Nganha (Adamawa plateau) and Kapsiki (northernmost plateau)...contamination on the observed trends. Key-words: Cameroon Line, alkaline complexes, felsic rocks, Zr- and |  | | Journal (article/letter/editorial) | | volcanism in the Upper Benue valley, northern Cameroon (Central Africa) Received: 16 June 2002 / Accepted:...mean) occur in the Upper Benue valley, northern Cameroon (Central Africa). The complete alkaline series...both the continental and oceanic sectors of the Cameroon Line. The Upper Benue valley basaltic magmas (87Sr/86Sr0...Garoua rift is the N120E–130E propagation in Cameroon of the Yola branch and is limited by strike-slip...valley. The Cameroon Line, a succession of horsts and rifts (rift names in italic), the Adamawa horst, the |  | Ngounouno, I., D�ruelle, B., Montigny, R., Demaiffe, D. (2005) Petrology and geochemistry of monchiquites from Tchircotch� (Garoua rift, north Cameroon, Central Africa) Mineralogy and Petrology, 83 (3) 167-190 doi:10.1007/s00710-004-0068-y | Journal (article/letter/editorial) | | monchiquites from Tchircotché (Garoua rift, north Cameroon, Central Africa) I. Ngounouno1 , B. Déruelle2...out in the Tchircotche area (Garoua rift, north Cameroon). They consist of a lamprophyric (monchiquite)...(monchiquite) series with diopside, subsilicic kaersutite and apatite phenocrysts, Ba–Ti-rich biotite microphenocrysts...differentiated basalts of the Cameroon Line. This supports a common magma source region. This mantle source is...support the occurrence of phlogopite in the source region of Tchircotche lamprophyre magma. 168 I. Ngounouno |  | | Journal (article/letter/editorial) | | host basaltic lava from Ngao Voglar volcano, Adamawa Massif (Cameroon Volcanic Line, West Africa): equilibrium...University of Ngaoundere, P.O. Box 454 Ngaoundere, Cameroon Department of Earth Sciences, Faculty of Sciences...University of Yaounde I, P.O. Box 812 Yaoundé, Cameroon; rtemdjim@yahoo.fr Corresponding author Spinel-bearing...Ngao Voglar volcano, 35 km northwest of Ngaoundere in the Adamawa volcanic Massif (Cameroon). They have...conditions of the upper mantle beneath the Ngaoundere region. The xenoliths exhibit protogranular textures and |  | Sharygin, V.V., Kóthay, K., Szabó, Cs., Timina, T.Ju., Török, K., Vapnik, Ye., Kuzmin, D.V. (2011) Rhönite in alkali basalts: silicate melt inclusions in olivine phenocrysts. Russian Geology and Geophysics, 52 (11) 1334-1352 doi:10.1016/j.rgg.2011.10.006 | Journal (article/letter/editorial) | | (Russia), Bakony-Balaton Highland, NógrádGömör Region (Hungary) and Makhtesh Ramon (Israel). Rhönite-bearing...kaersutitic amphibole mega/xenocrysts and of kaersutite in deep-seated xenoliths in alkali basalts. The...occurrences and origins Association Genesis Locality/region Reference Miaskitic alkaline Si-undersaturated...De Ignacio et al., 2010; Kogarko et al., 2005 Cameroon Nono et al., 1994 Daughter phase of silicate...partial alteration of kaersutite Interstitial mineral or alteration product of kaersutite Ananiev and Okrugin |  | Marzoli, Andrea, Aka, Festus T., Merle, Renaud, Callegaro, Sara, N’ni, Jean (2015) Deep to shallow crustal differentiation of within-plate alkaline magmatism at Mt. Bambouto volcano, Cameroon Line. Lithos, 220. 272-288 doi:10.1016/j.lithos.2015.02.005 | Journal (article/letter/editorial) | | within-plate alkaline magmatism at Mt. Bambouto volcano, Cameroon Line Andrea Marzoli, Festus T. Aka, Renaud...within-plate alkaline magmatism at Mt. Bambouto volcano, Cameroon Line, LITHOS (2015), doi: 10.1016/j.lithos...within-plate alkaline magmatism at Mt. Bambouto volcano, Cameroon Line T Andrea Marzoli* SC R Padova, Italy...Mining Research (IRGM), P.O Box 4110 Yaoundé, Cameroon Renaud Merle MA Department of Applied Geology...Mining Research (IRGM), P.O Box 4110 Yaounde, Cameroon AC Corresponding author: andrea.marzoli@unipd |  | LEGENDRE, C., MAURY, R. C., CAROFF, M., GUILLOU, H., COTTEN, J., CHAUVEL, C., BOLLINGER, C., HÉMOND, C., GUILLE, G., BLAIS, S., ROSSI, P., SAVANIER, D. (2005) Origin of Exceptionally Abundant Phonolites on Ua Pou Island (Marquesas, French Polynesia): Partial Melting of Basanites Followed by Crustal Contamination. Journal of Petrology, 46 (9) 1925-1962 doi:10.1093/petrology/egi043 | Journal (article/letter/editorial) | | this tholeiitic unit located at the base of the volcano pile (at its northeastern edge) is the oldest exposed...clasts in some diatremes from the Miocene Dunedin volcano (New Zealand) range from 56% to almost 100% (Price...absent from Ua Pou. In addition, Ua Pou and Dunedin volcano display particularly striking similarities: these...phonolitic materials, have been recognized in Dunedin volcano (Price & Chappell, 1975). In Tenerife, the Upper...aegirineaugite; horn., edenitic hornblende; kaer., kaersutite; ilm, ilmenite; usp, ulvöspinel; neph., nepheline; |  | | Report (issue) | | (Bottom) Carbonatite lava at Oldoinyo Lengai volcano, northern Tanzania. Courtesy Alexander J. Teague...and natrocarbonatite lavas at Oldoinyo Lengai volcano, Tanzania. . . . . . . . . . . . . . . . . . ....Hanley, Terry M. Seward, and Frederik Reutten 9. Cameroon Line alkaline magmatism (central Africa): A reappraisal...fingerprints of mantle metasomatism beneath Nyos volcano (Cameroon volcanic line) . . . . . . . . . . . . . ...40Ar-39Ar ages and petrogenesis of the Massif d’Ambre volcano, northern Madagascar . . . . . . . . . . . . . |
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