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Articles, 7 records found
Articles 7 records found  
1.
22 p, 1.9 MB Spatial and temporal evolution of hydrothermal alteration at Lavras do Sul, Brazil : Evidence from dioctahedral clay minerals / Bongiolo, Everton Marques (Universidade Federal do Rio Grande do Sul. Instituto de Geociências) ; Patrier-Mas, Patricia (Université de Poitiers) ; Mexias, André Samparo (Universidade Federal do Rio Grande do Sul. Instituto de Geociências) ; Beaufort, Daniel (Université de Poitiers) ; Laquintinie Formoso, Milton Luiz (Universidade Federal do Rio Grande do Sul. Instituto de Geociências)
The Au-Cu (±Pb, Zn, Ag) prospects of Lavras do Sul, southernmost Brazil, are hosted in Neoproterozoic granitic and volcanogenic rocks. Mineralization occurs in structurally controlled N40°W to E-W quartz veins; sericite (±chlorite) and sulfides are the main secondary minerals in associated wall rocks. [...]
2008 - 10.1346/CCMN.2008.0560207
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 222-243  
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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.
26 p, 3.8 MB Experimental study of the stability and phase relations of clays at high temperature in a thermal gradient / Vidal, O. (Université Joseph Fourier) ; Baldeyrou, A. (Université de Strasbourg) ; Beaufort, Daniel (Université Poitiers) ; Fritz, B. (Université de Strasbourg) ; Geoffroy, N. (Université Joseph Fourier) ; Lanson, Bruno (Université Joseph Fourier)
Clays are involved in a variety of natural and managed processes, and calculation of their stability conditions is important. Such calculations are still fraught with large uncertainties owing to the lack of experimental constraints on the thermodynamic properties of clays, and bracketing of equilibrium reactions at low temperature is barely possible. [...]
2012 - 10.1346/CCMN.2012.0600209
Clays and Clay Minerals, Vol. 60, Núm. 2 (2012) , p. 200-225  
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4.
19 p, 2.0 MB Mineralogy and geochemistry of the host-rock alterations associated with the Shea Creek unconformity-type uranium deposits (Athabasca Basin, Saskatchewan, Canada). Part 2. Regional-scale spatial distribution of the Athabasca Group sandstone matrix minerals / Kister, Philippe (Centre National de la Recherche Scientifique (França)) ; Laverret, Emmanuel (Université de Poitiers) ; Quirt, David (Saskatchewan Research Council) ; Cuney, Michel (Centre National de la Recherche Scientifique (França)) ; Patrier Mas, Patricia (Université de Poitiers) ; Beaufort, Daniel (Université de Poitiers) ; Bruneton, Patrice (Business Unit Mines)
The spatial distribution of the dominant matrix minerals present in the middle-Proterozoic Athabasca Group sandstone (kaolin, illite, sudoite, dravite, hematite) was studied at a regional scale in the Shea Creek region (Saskatchewan, Canada), in which two epigenetic unconformity-type uranium deposits have been discovered. [...]
2006 - 10.1346/CCMN.2006.0540302
Clays and Clay Minerals, Vol. 54, Núm. 3 (2006) , p. 295-313  
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5.
20 p, 2.2 MB Mineralogy and geochemistry of the host-rock alterations associated with the Shea Creek unconformity-type uranium deposits (Athabasca Basin, Saskatchewan, Canada). Part 1. Spatial variation of illite properties / Laverret, Emmanuel (University of Poitiers) ; Patrier Mas, Patricia (University of Poitiers) ; Beaufort, Daniel (University of Poitiers) ; Kister, Philippe (Centre National de la Recherche Scientifique (França)) ; Quirt, David (Saskatchewan Research Council) ; Bruneton, Patrice (Business Unit Mines) ; Clauer, Norbert (Centre de Géochimie de la Surface)
Unconformity-related uranium deposits, which represent a significant high-grade uranium resource, are systematically surrounded by a host-rock alteration halo enriched in clay minerals. Illite is often the major clay mineral component of the halo and it displays a variable crystal structure. [...]
2006 - 10.1346/CCMN.2006.0540301
Clays and Clay Minerals, Vol. 54, Núm. 3 (2006) , p. 275-294  
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6.
19 p, 3.4 MB Clay minerals in basalt-hawaiite rocks from mururoa atoll (French polynesia). I. mineralogy / Mas, Antoine (University of Poitiers) ; Meunier, Alain (University of Poitiers) ; Beaufort, Daniel (University of Poitiers) ; Patrier, Patricia (University of Poitiers) ; Dudoignon, Patrick (University of Poitiers)
Clay minerals in chilled or brecciated margins (altered glass) and massive inner crystalline parts (mesostasis) of three basalt-hawaiite bodies from Mururoa Atoll (French Polynesia) have been studied in order to compare their chemical and mineralogical compositions. [...]
2008 - 10.1346/CCMN.2008.0560611
Clays and Clay Minerals, Vol. 56, Núm. 6 (2008) , p. 711-729  
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7.
21 p, 3.4 MB Clay minerals in basalt-hawaiite rocks from Mururoa Atoll (French Polynesia). II. petrography and geochemistry / Meunier, Alain (University of Poitiers) ; Mas, Antoine (University of Poitiers) ; Beaufort, Daniel (University of Poitiers) ; Patrier, Patricia (University of Poitiers) ; Dudoignon, Patrick (University of Poitiers)
The clay minerals formed in chilled margins and massive crystallized inner parts of three basalt-hawaiite bodies of Mururoa Atoll (French Polynesia) exhibit contrasting textures. Glass alteration textures are observed around fractures crosscutting the quenched margins: Fe-rich clays grow inward into the glass (retreating surface) while Mg-rich clays grow outward (open space). [...]
2008 - 10.1346/CCMN.2008.0560612
Clays and Clay Minerals, Vol. 56, Núm. 6 (2008) , p. 730-750  
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