Geochemistry of peridotite and granite xenoliths during the early stage of weathering in the Nyos volcanic region (NW Cameroon): Implications for PGE exploration
作者： Paul Bilong , Paul-Désiré Ndjigui , Robert Temdjim , Elisé Sababa
DOI: 10.1016/J.CHEMER.2010.07.001
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摘要: Abstract Peridotite and granite xenoliths, in the early stage of weathering, occur Nyos volcanic region (NW Cameroon). Geochemical data shows that peridotites are marked by high concentrations MgO (42.30 wt.%, with SiO 2 /MgO ∼ 1), chromium (2100 ppm), nickel (2100 ppm) cobalt (104 ppm), as well low lanthanide contents (ΣREE: 7.41 ppm). Granites display (70–73 wt.%), mostly peraluminous (1.40 > A/CNK The geochemical survey Platinum-Group Elements (PGE) done these rocks weathering PGE less than 7 ppb peridotites. highly concentrated elements ruthenium (6.26 ppb) platinum (5.53 ppb). total content is 14.57 ppb. These normalized respect to chondrites a flat spectrum from iridium platinum. granites below detection limit except for two samples (LNY01 LNY02) whose close 0.23 ppb.
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sci-hub.se 参考文章(28)
Rigobert Tchameni, Geochimie et geochronologie des formations de l'archeen et du paleoproterozoique du sud-cameroun (groupe du ntem, craton du congo) Orléans. ,(1997)
Daouda Traoré, Serpentinisation hydrothermale et altération latéritique des roches ultrabasiques en milieu tropical : Evolution géochimique et minéralogique de la minéralisation en platine de la Rivière des Pirogues (Nouvelle-Calédonie) Université de la Nouvelle-Calédonie. ,(2005)
Jean E. Delvigne, Atlas of Micromorphology of Mineral Alteration and Weathering ,(1998)
Jean-Pierre Lorand, Ambre Luguet, Olivier Alard, Antoine Bezos, Thomas Meisel, Abundance and distribution of platinum-group elements in orogenic lherzolites; a case study in a Fontete Rouge lherzolite (French Pyrenees) Chemical Geology. ,vol. 248, pp. 174- 194 ,(2008) , 10.1016/J.CHEMGEO.2007.06.030
W.F. McDonough, S.-s. Sun, The composition of the Earth Chemical Geology. ,vol. 120, pp. 223- 253 ,(1995) , 10.1016/0009-2541(94)00140-4
A. Nedelec, E.N. Nsifa, H. Martin, Major and trace element geochemistry of the Archaean Ntem plutonic complex (south Cameroon): petrogenesis and crustal evolution Precambrian Research. ,vol. 47, pp. 35- 50 ,(1990) , 10.1016/0301-9268(90)90029-P
Yann Rolland, Stephen Cox, Anne-Marie Boullier, Giorgio Pennacchioni, Neil Mancktelow, Rare earth and trace element mobility in mid-crustal shear zones: insights from the Mont Blanc Massif (Western Alps) Earth and Planetary Science Letters. ,vol. 214, pp. 203- 219 ,(2003) , 10.1016/S0012-821X(03)00372-8
Mei-Fu Zhou, C. Michael Lesher, Zhengxi Yang, Jianwei Li, Min Sun, Geochemistry and petrogenesis of 270 Ma Ni-Cu-(PGE) sulfide-bearing mafic intrusions in the Huangshan district, Eastern Xinjiang, Northwest China : implications for the tectonic evolution of the Central Asian Orogenic belt Chemical Geology. ,vol. 209, pp. 233- 257 ,(2004) , 10.1016/J.CHEMGEO.2004.05.005
W.D. Maier, Platinum-group element (PGE) deposits and occurrences: Mineralization styles, genetic concepts, and exploration criteria Journal of African Earth Sciences. ,vol. 41, pp. 165- 191 ,(2005) , 10.1016/J.JAFREARSCI.2005.03.004
Robert Temdjim, Pierre Boivin, Gilles Chazot, Claude Robin, Émilie Rouleau, L'hétérogénéité du manteau supérieur à l'aplomb du volcan de Nyos (Cameroun) révélée par les enclaves ultrabasiques Comptes Rendus Geoscience. ,vol. 336, pp. 1239- 1244 ,(2004) , 10.1016/J.CRTE.2004.07.005