Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Oumarou F. Nkouandou"'
Autor:
Oumarou F. Nkouandou, Jacques-Marie Bardintzeff, M. Mey Atour, R. Tchameni, A. Fagny Mefire, A. Dinamou
Publikováno v:
Acta Geochimica. 40:287-299
The Temte basement in North Cameroon is crosscut by dyke swarms with N 20°–40° trending, including dykes 15–30 m wide, up to 3 km-long. Representative rocks exhibit intersertal to sub-ophitic textures. Electron microprobe analyses identified di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8660b631f06d50b9fa35950d70b7b689
https://doi.org/10.1007/s11631-020-00432-4
https://doi.org/10.1007/s11631-020-00432-4
Publikováno v:
Arabian Journal of Geosciences
Arabian Journal of Geosciences, Springer, 2020, 13 (12), ⟨10.1007/s12517-020-05442-3⟩
Arabian Journal of Geosciences, Springer, 2020, 13 (12), ⟨10.1007/s12517-020-05442-3⟩
International audience; Low-Ca clinopyroxene crystal of pigeonite composition has been discovered in the Tchabal Mbabo volcano massif of the Cameroon Volcanic Line (CVL), a long active N30° chain of volcanic centres and ring complexes in Central Afr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ced5c3488e5ea525126d44506d9d1a4
https://doi.org/10.1007/s12517-020-05442-3
https://doi.org/10.1007/s12517-020-05442-3
Autor:
Robert Temdjim, Z. N.Njankouo Ndassa, G. O. Iancu, Oumarou F. Nkouandou, Hervé Guillou, Jacques-Marie Bardintzeff, Aminatou M. Fagny
Publikováno v:
Journal of African Earth Sciences
Journal of African Earth Sciences, 2020, 170, ⟨10.1016/j.jafrearsci.2020.103832⟩
Journal of African Earth Sciences, Elsevier, 2020, 170, ⟨10.1016/j.jafrearsci.2020.103832⟩
Journal of African Earth Sciences, 2020, 170, ⟨10.1016/j.jafrearsci.2020.103832⟩
Journal of African Earth Sciences, Elsevier, 2020, 170, ⟨10.1016/j.jafrearsci.2020.103832⟩
International audience; Tchabal Mbabo massif within the Cameroon Volcanic Line (CVL) at the junction with Adamawa line in Central Africa is a huge (55 × 30km × 2340 m) Eocene-Oligocene volcano composed of frankly alkali lavas of basanites and basal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c49e3017e17d74f19b900b039f960783
https://doi.org/10.1016/j.jafrearsci.2020.103832
https://doi.org/10.1016/j.jafrearsci.2020.103832
Publikováno v:
Journal of African Earth Sciences. 111:26-40
Ultramafic xenoliths (lherzolite, harzburgite and olivine websterite) have been discovered in basanites close to Ngaoundere in Adamawa plateau. Xenoliths exhibit protogranular texture (lherzolite and olivine websterite) or porphyroclastic texture (ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a5aaa68be89b4b70619cbcc24a4912c
https://doi.org/10.1016/j.jafrearsci.2015.07.004
https://doi.org/10.1016/j.jafrearsci.2015.07.004
Autor:
Oumar Mahamat, Oumarou F. Nkouandou, Alembert Alexandre Ganwa, Jacques-Marie Bardintzeff, Aminatou Fagny Mefire
Publikováno v:
Open Geosciences, Vol 9, Iss 1, Pp 138-150 (2017)
Dolerite dykes are widespread in the Mongo area within the granitic Guéra Massif (Chad, Central Africa). Dykes are several hundred metres to several kilometres long, a metre to decametre thick, and vertical, crosscutting the Pan-African granitic bas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::363df0572c463e4b3851a0600037c41c
https://doi.org/10.1515/geo-2017-0012
https://doi.org/10.1515/geo-2017-0012
Publikováno v:
International Journal of Biological and Chemical Sciences; Vol 10, No 4 (2016); 1903-1917
New insights on geochemistry of the alkaline volcanism of Ngaoundere in Adamawa plateau enable the petrogenesis modelling of Ngaoundere Miocene lava series. Mass-balance crystal fractionation, closed-system Assimilation, Fractional Crystallization (A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec62eed7b5a0f87869356ed56cc880c9
https://www.ajol.info/index.php/ijbcs/article/view/153756
https://www.ajol.info/index.php/ijbcs/article/view/153756
Autor:
Oumarou F. Nkouandou, Robert Temdjim
Publikováno v:
Journal of GEOsciences. :375-387
Spinel-bearing lherzolite xenoliths have been recovered from Mio–Pliocene alkaline basalt flows of the Ngao Voglar volcano, 35 km northwest of Ngaoundere in the Adamawa volcanic Massif (Cameroon). They have been examined to characterize the petrogr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24dcdb42e34e30c31fabb109692289a9
https://doi.org/10.3190/jgeosci.108
https://doi.org/10.3190/jgeosci.108
Autor:
Raymond Montigny, Daniel Ohnenstetter, Ismaïla Ngounouno, Bernard Déruelle, Daniel Demaiffe, Oumarou F. Nkouandou
Publikováno v:
Comptes Rendus Geoscience. 340:28-37
Basaltic flows and thirty-five plugs of felsic alkaline volcanic rocks (phonolites and trachytes) of Mio-Pliocene age are exposed to the north and east of Ngaoundere (Adamawa, Cameroon). The series is composed of alkaline basalts, hawaiites, mugearit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49269ec7064a3c8b1766f6260c1cfa68
https://doi.org/10.1016/j.crte.2007.10.012
https://doi.org/10.1016/j.crte.2007.10.012
Publikováno v:
International Journal of Biological and Chemical Sciences; Vol 4, No 4 (2010)
Des coulees et projections basaltiques recentes (basaltes: I.D. © 2010 International Formulae Group. All rights reserved. Mots cles : Petrologie, geochimie, laves basaltiques recentes, FOZO, Plateau de l’Adamaoua, Cameroun.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67d9ace77ebadf4389fbd2c2b28b9d3f
https://www.ajol.info/index.php/ijbcs/article/view/63038
https://www.ajol.info/index.php/ijbcs/article/view/63038