Home > Search Results: Vieillard, Philippe
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Articles, 4 records found
Articles 4 records found  
1.
16 p, 2.4 MB Alteration of spodumene to cookeite and its pressure and temperature stability conditions in Li-bearing aplite-pegmatites from northern Portugal / Bobos, Iuliu (Universidade do Porto) ; Vieillard, Philippe (Université de Poitiers) ; Charoy, Bernard (Ecole Normale Supérieure de Géologie) ; Noronha, Fernando (Universidade do Porto)
The alteration of spodumene to cookeite has been identified in a Li-bearing aplite-pegmatite from northern Portugal. Optical microscopy and scanning and transmission electron microscopy (SEM/TEM) were used to characterize the alteration products in both cookeite + quartz and cookeite, + kaolinite ± mica assemblages. [...]
2007 - 10.1346/CCMN.2007.0550306
Clays and Clay Minerals, Vol. 55, Núm. 3 (2007) , p. 295-310  
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2.
12 p, 1.1 MB Application of chemical geothermometry to low-temperature trioctahedral chlorites / Inoue, Atsuyuki (Chiba University. Department of Earth Sciences) ; Meunier, Alain (Université de Poitiers) ; Patrier-Mas, Patricia (Université de Poitiers) ; Rigault, Cecile (Université de Poitiers) ; Beaufort, Daniel (Université de Poitiers) ; Vieillard, Philippe (Université de Poitiers)
Low-temperature chlorites formed in diagenetic to low-grade metamorphic environments generally have greater Si contents and larger numbers of octahedral vacancies, and smaller Fe+Mg contents than higher-grademetamorphic chlorites. [...]
2009 - 10.1346/CCMN.2009.0570309
Clays and Clay Minerals, Vol. 57, Núm. 3 (2009) , p. 371-382  
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3.
16 p, 1.4 MB Hydrothermal synthesis, between 75 and 150°C, of high-charge, ferric nontronites / Decarreau, Alain (Université de Poitiers. UMR 6532 HydrASA. CNRS/INSU) ; Petit, Sabine (Université de Poitiers. UMR 6532 HydrASA. CNRS/INSU) ; Martin, François (ERT 1074 CNRS Géomatériaux. LMTG-OMP-UPS-IRD. CNRS) ; Farges, François (USM 201 - UMR CNRS 7160. Muséum National d'Histoire Naturelle) ; Vieillard, Philippe (Université de Poitiers. UMR 6532 HydrASA. CNRS/INSU) ; Joussein, Emmanuel (Université de Limoges. UMR 6532 HydrASA. CNRS/INSU)
High-charge nontronites were synthesized at 75, 90, 100, 110, 125, and 150°C from a silicoferrous starting gel with SiFeNa O. nHO Composition. This gel was oxidized in contact with air and then hydrothermally treated, for a period of 4 weeks, under equilibrium water pressure. [...]
2008 - 10.1346/CCMN.2008.0560303
Clays and Clay Minerals, Vol. 56, Núm. 3 (2008) , p. 322-337  
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4.
12 p, 504.0 KB Differences in the dehydration-rehydration behavior of halloysites : New evidence and interpretations / Joussein, Emmanuel (CNRS UMR 6532 HydrASA. Faculté des Sciences) ; Petit, Sabine (CNRS UMR 6532 HydrASA. Faculté des Sciences) ; Fialips, Claire-Isabelle (School of Civil Engineering and Geosciences. University of Newcastle upon Tyne) ; Vieillard, Philippe (CNRS UMR 6532 HydrASA. Faculté des Sciences) ; Righi, Dominique (CNRS UMR 6532 HydrASA. Faculté des Sciences)
Two reference halloysites from New Zealand (Te Puke and Opotiki) were studied by X-ray diffraction under (1) various levels of relative humidity (RH) from 95 to 0% (dehydration), and (2) various temperatures increasing from 25 to 120°C (dehydration). [...]
2006 - 10.1346/CCMN.2006.0540408
Clays and Clay Minerals, Vol. 54, Núm. 4 (2006) , p. 473-484  
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