Výsledky vyhledávání - "Mohamed Nasraoui"

Évolution géochimique du pyrochlore au cours de l'altération météorique du gisement de Catalão II (Goiás, Brésil)

Autor: Essaïd Bilal, Pierre de Parseval, Mohamed Nasraoui, Erenaldo Rocha, François Soubiès

Publikováno v: Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science. 332:91-98

L'évolution cristallochimique de pyrochlores au cours de l'altération météorique a été suivie, au moyen de techniques classiques d'investigation minéralogique (microscopie optique, MEB, microsonde électronqiue), sur des sondages et tranchées

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b804c419445faa19fd35d93ed44e2a48
https://doi.org/10.1016/s1251-8050(00)01504-4

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Altération hydrothermale des monazites-(Ce) des pegmatites du district de Santa Maria de Itabira (Minas Gerais, Brésil)

Autor: Bruno Fernando Riffel, V. R. P. R. O. Marciano, Mohamed Nasraoui, Kazuo Fuzikawa, José Marques Correia Neves, Essaïd Bilal, Maria Lourdes Souza Fernandes, Hermínio Arias Nalini

Publikováno v: Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science. 326:693-700

Monazite-(Ce) is found in granitic pegmatites in the Santa Maria de Itabira pegmatite district (Minas Gerais, Brazil). During the magmatic stage, monazite-(Ce) seems to have had higher contents of cheralite and huttonite in the solid solution. The Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::da71b447f5aa280c70cd530a435f884d
https://doi.org/10.1016/s1251-8050(98)80180-8

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Typology of the granitic stones of the cathedral of Evora (Portugal): A combined contribution of geochemistry and Fe-57 Mossbauer spectroscopy

Autor: Essaïd Bilal, João C. Waerenborgh, Maria Isabel Prudêncio, Mohamed Nasraoui

Publikováno v: Journal of Cultural Heritage
Journal of Cultural Heritage, Elsevier, 2002, 3 (2), pp.127-132. ⟨10.1016/S1296-2074(02)01167-6⟩
Journal of Cultural Heritage, 2002, 3 (2), pp.127-132. ⟨10.1016/S1296-2074(02)01167-6⟩

International audience; A geochemical study, including a detailed investigation of Fe by Mössbauer spectroscopy, was undertaken to characterise the different varieties of the stones in the cathedral of Évora (Portugal). Ten representative stone sam

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e23c82d6a597197047211375450602d
https://hal.archives-ouvertes.fr/hal-01350637

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Geochemical evolution of pyrochlore during supergene alteration of Catalão II ore deposits

Autor: Eronaldo Bomfim Rocha, Mohamed Nasraoui, Essaïd Bilal, François Soubiès

Publikováno v: Journal of African Earth Sciences
Journal of African Earth Sciences, 2001, 32 (1), pp.A29. ⟨10.1016/S0899-5362(01)90058-2⟩
Journal of African Earth Sciences, Elsevier, 2001, 32 (1), pp.A29. ⟨10.1016/S0899-5362(01)90058-2⟩

International audience; pas de résumé

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e5b43a7dc9179f623f85d174f01863b
https://hal-emse.ccsd.cnrs.fr/emse-00497178

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Pyrochlores from the Lueshe carbonatite complex (Democratic Republic of Congo): a geochemical record of different alteration stages

Autor: Mohamed Nasraoui, Essaïd Bilal

Publikováno v: Journal of Southeast Asian earth sciences
Journal of Southeast Asian earth sciences, Elsevier, 2000, 18 (2), pp.237-251. ⟨10.1016/S1367-9120(99)00056-5⟩
Journal of Southeast Asian earth sciences, 2000, 18 (2), pp.237-251. ⟨10.1016/S1367-9120(99)00056-5⟩

International audience; Magmatic pyrochlores from the Lueshe syenite-carbonatite complex from the northeastern part of Democratic Republic of Congo (ex-Zaire) are characterized by Ta/Nb ratios in an increasing order from pyroxenite, calcite-carbonati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74609bf75f5ec0d69baa1051a3514cd2
https://hal-emse.ccsd.cnrs.fr/emse-00497149

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Differentiated hydrothermal and meteoric alterations of the Lueshe carbonatite complex (Democratic Republic of Congo) identified by a REE study combined with a sequential acid-leaching experiment

Autor: Norbert Clauer, Theofilos Toulkeridis, Mohamed Nasraoui, Essaïd Bilal

Publikováno v: Chemical Geology
Chemical Geology, 2000, 165 (1-2), pp.109-132. ⟨10.1016/S0009-2541(99)00165-5⟩
Chemical Geology, Elsevier, 2000, 165 (1-2), pp.109-132. 〈10.1016/S0009-2541(99)00165-5〉
Chemical Geology, Elsevier, 2000, 165 (1-2), pp.109-132. ⟨10.1016/S0009-2541(99)00165-5⟩

International audience; The behavior of race-earth elements (REE) during hydrothermal alteration and progressive weathering has been studied by acid-leaching experiments on minerals and whole-rock samples of the Lueshe carbonatite complex (NE of Demo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::661fd090ed4f4d7c1a8af635916a0bb6
https://hal-emse.ccsd.cnrs.fr/emse-00497142

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Fresh and weathered pyrochlore studies by Fourier transform infrared spectroscopy coupled with thermal analysis

Autor: Essaïd Bilal, Mohamed Nasraoui, Raymonde Gibert

Publikováno v: Mineralogical Magazine
Mineralogical Magazine, Mineralogical Society, 1999, 63 (4), pp.567-578
Mineralogical Magazine, 1999, 63 (4), pp.567-578

Fresh and weathered pyrochlore from the Lueshe carbonatite complex (in the northeast of the Democratic Republic of Congo) was studied by Fourier transfom infrared (FTIR) spectroscopy and by a combination of FTIR spectroscopy and thermal analysis. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5fe380bd1a5b0816d46123aa8e48d68
https://hal.archives-ouvertes.fr/hal-01352728

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Fe speciation in weathered pyrochlore-group minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy

Autor: Mohamed Nasraoui, João C. Waerenborgh

Publikováno v: CIÊNCIAVITAE
Scopus-Elsevier

The minerals of the pyrochlore group exhibit a large range of chemical composition. The general structural formula can be written as A 2− m B 2 X 6− w Y 1− n · p H 2 O. The occupancy of the eight-fold-coordinated A site can reflect the degree

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8013e8fc1ace3b4a76bd3704c504b4a0
http://www.scopus.com/inward/record.url?eid=2-s2.0-0035428893&partnerID=MN8TOARS

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