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Anion-exchange in takovite : applications to other hydroxide mineralsLa takovite, un des membres du groupe des pyroaurites qui contient du nickel a été, ainsi que son minéral apparenté l'hydrotalcite, soumise à des traitements, à 25 °C, par des solutions, 0,1 M de HCl, HNO₃, H₂SO₄, NiSO₄, Al₂(SO₄)₃ et KOH. La diffraction des rayons X et la spectroscopie aux infrarouges appliquées aux matériaux traités confirment que les groupes carbonates du minéral d'origi... ...
Tập 103 Số 2 - Trang 170-175 - 1980
Saline fluid inclusions associated with retrograde metamorphismLa composition des inclusions fluides de filons et lentilles de quartz dans deux séries de roches métamorphiques rétromorphosées suggère un équilibre entre les fluides et les assemblages de minéraux rétromorphiques.
Les métagraywackes et amphibolites riches en calcium contiennent des saumures à CaCl2 et NaCl tandis que les métapélites pauvres en calcium contiennent d... ...
Tập 102 Số 5 - Trang 562-568 - 1979
Origin of coffinite in sedimentary rocks by a sequential adsorption-reduction mechanismCoffinite is the dominant ore mineral in the tabular vanadium-uranium ores of the Tony M mine in the Henry Mountains Mineral Belt of the Colorado Plateau physiographic province of the United States. This ore body formed at a density-stratified solution interface between uranyl ion bearing-meteoric water and a saline fluid which was locally reducing. Uranium localization at this solution in... ...
Tập 110 Số 2 - Trang 131-144 - 1987
Petrofabrics and microstructures of omphacites in a high temperature eclogite from the Swedish CaledonidesEclogites from the Eastern Belt of the Seve Nappes, Jämtland, Central Scandinavian Caledonides, have an LS fabric in which the foliation S and lineation L are both defined by the shape preferred orientation of omphacite.
The orientation distribution diagram of omphacite reveals a crystallographic fabric defined by [001] parallel to L and [010] in a great circle distr... ...
Tập 106 Số 6 - Trang 709-713 - 1983
Evolution des propriétés magnétiques lors des transformations minérales dans les roches : exemple du Jurassique Dauphinois (Alpes françaises)Magnetic mineralogy is the study of the magnetic properties of rocks related to their chemical and mineralogical composition. Here is presented a brief definition of these properties, the methods for their study and the abilities for quantitative determination of minerals, essentially iron compounds. The complicated case of the Dauphinois Jurassic calcareous shales emphasizes the various p... ...
Tập 109 Số 6 - Trang 687-696 - 1986
A fluid inclusion study of the copper mineralization in Southwest Tintic District (Utah)L'étude microthermométrique des inclusions fluides a confirmé que la minéralisation de Southwest Tintic se rattache au type porphyre cuprifère, et a permis en outre de dégager ses caractères spécifiques :
— Le début de l'activité hvdrothermale est marqué par la circulation de saumures riches en NaCl, KCl et, entre autres, en chalcopyrite (1 000 à 2 000 p. p. m. Cu) v... ...
Tập 102 Số 5 - Trang 622-632 - 1979
Oxidation-reduction processes in the genesis of the uranium-vanadium tabular deposits of the Cottonwood Wash mining area (Utah, U.S.A.) : evidence from petrological study and organic matter analysisThe Cottonwood Wash U-V tabular deposits are hosted by the Salt-Wash Member of the Jurassic Morrison Formation. Petrological study of ore and barren host-rocks and analysis of organic matter were conducted to test redox genetic models. Barren sandstones are mainly cemented by quartz, calcite and kaolinite. Tabular ore is cemented by U-bearing vanadiferous clays. Pitchblende and coffinite a... ...
Tập 110 Số 2 - Trang 145-156 - 1987
Significance of fluid phases associated with shear zone Cu-Au mineralisation in the Doré Lake complex, Chibougamau, QuebecLes études microthermométriques de 400 inclusions secondaires provenant des zones B et D du gisement Henderson montrent la coexistence de deux fluides, une solution aqueuse chlorurée, fortement chargée en sels (NaCl et CaCl2) et un fluide riche en méthane. Les analyses des ions en solutions effectuées sur 16 échantillons indiquent que Na+ et Ca+2 représentent la presque totalité des cation... ...
Tập 102 Số 5 - Trang 569-576 - 1979
Le porphyre cuprifère de Sierrita-Esperanza, Arizona, U.S.A. Comparaison avec quelques porphyres voisinsCette étude du porphyre cuprifère de Sierrita-Esperanza est d'abord orientée vers l'analyse de la répartition des altérations et minéralisations.
On notera l'importance de l'altération « potassique » (néoformation de feldspath K) et de l'altération « quartz-séricite » (néoformation de muscovite) qui se superpose plus ou moins à la première.
En ... ...
Tập 103 Số 6 - Trang 613-622 - 1980
Etude expérimentale de la distribution du fer ferrique entre spinelle chromifère et bain silicaté basiqueThe partitioning of ferric iron between chromian spinel and basic silicate melt was studied experimentally. Runs were carried out at temperatures of 1 180-1 300 °C and oxygen fugacities of 10-3-10-9 atm, at one atmosphere total pressure. A linear relationship exists between the Fe2O3 content of chromian spinel (known by microprobe analysis) and the Fe2O3 content of the liquid (calculated f... ...
Tập 107 Số 1 - Trang 25-33 - 1984