Special features of the chemical and mineralogic composition of clays from the Maidan-Vil’skoe deposit

1998 ◽  
Vol 55 (9-10) ◽  
pp. 295-296 ◽  
Author(s):  
A. M. Digdalovich ◽  
M. P. Pona ◽  
Yu. M. Bek
Keyword(s):  
Mineralogic Composition

Etude mineralogique du minerai de fer oolithique d'Auboue, bassin de Briey

1948 ◽  
Vol S5-XVIII (6-7) ◽  
pp. 529-536
Author(s):  
Simonne Caillere ◽  
F. Kraut
Keyword(s):  
Iron Ore ◽  
The Other ◽  
Minor Importance ◽  
Clastic Material ◽  
Ore Formation ◽  
Green Zone ◽  
Oolitic Iron Ore ◽  
Mineralogic Composition

Abstract In general the mineralogic composition of the various zones in the Jurassic oolitic iron ore formation of the Auboue area, Briey basin, France, is the same. The green zone is distinct, however, in that both the oolites and the gangue are chloritic, whereas in the other zones, they are composed of different minerals. Study of the ore showed that organisms played an important role in the development of the ferruginous oolites and that clastic material was of only minor importance.

Sur la genese des gisements de bauxite du sud-est de la France

1966 ◽  
Vol S7-VIII (5) ◽  
pp. 685-701 ◽  
Author(s):  
Ida Valeton
Keyword(s):  
Vertical Direction ◽  
Terra Rossa ◽  
Southern France ◽  
Lateritic Soils ◽  
Intensity Of Development ◽  
Mineralogic Composition

Abstract The bauxites of southern France--in particular those of upper Var--result from the alteration of lateritic soils formed at the expense of various rocks from crystalline and crystalline-phyllitic massifs (notably the Maures-Esterel of the Brignoles region). The resulting detrital grains are of varied granulometric and mineralogic composition; they have been transported into vast basins formed on surfaces of Jurassic and basal Cretaceous limestone karst into which they were deposited. Various hydrostatic levels in different basins have caused, during the course of diagenesis, modifications in structure and chemical and mineralogic composition (gibbsite, boehmite, and diaspore facies of the bauxites). The intensity of development is related to erosion that has acted mainly in a vertical direction; it has been controlled by subterranean karst drainage. Post-diagenetic effects, such as the mobilization of iron and the formation of terra rossa, have caused the formation of polygenetic soils.

MINERALOGIC COMPOSITION OF KIMBERLITES AND LAMPROITES AS AN INDICATOR OF DIAMOND POTENTIAL

1989 ◽  
Vol 31 (5) ◽  
pp. 484-495
Author(s):  
V. V. Verzhak ◽  
V. K. Garanin ◽  
G. P. Kudryavtseva ◽  
O. A. Mikhaylichenko
Keyword(s):  
Diamond Potential ◽  
Mineralogic Composition

Sur les phenomenes de recristallisation dans la serie metamorphique du mont Pilat (Massif central); albitisation et retromorphose

1961 ◽  
Vol S7-III (4) ◽  
pp. 409-416
Author(s):  
Maurice Chenevoy
Keyword(s):  
Strict Sense ◽  
Hydrothermal Solutions ◽  
Retrograde Metamorphism ◽  
Massif Central ◽  
Primary Minerals ◽  
Mineralogic Composition

Abstract Analysis of the metamorphism of rocks of the Pilat massif and elsewhere in the Central Massif region, France, results in recognition of three types of metamorphic reconstitution-- textural rearrangement of primary minerals, development of instability of primary minerals without obliteration of the original mineralogic composition of the rock (retrograde metamorphism in its strict sense), and recrystallization. Albitization observed at various horizons is considered due to topochemical recrystallization rather than to introduction of soda by hydrothermal solutions.

scholarly journals EVOLUÇÃO GEOLÓGICA DOS GRUPOS CANASTRA E IBIÁ NA REGIÃO ENTRE COROMANDEL E GUARDA-MOR, MG

1994 ◽  
Author(s):  
Luciana Felício Pereira ◽  
Marcel Auguste Dardenne ◽  
Carlos Alberto Rosière ◽  
Antônio Carlos Pedrosa-Soares
Keyword(s):  
Tidal Flat ◽  
Single Event ◽  
Fold Belt ◽  
Shallow Marine ◽  
Glacial Origin ◽  
Second Stage ◽  
Dominant Component ◽  
Thrust Tectonics ◽  
Mineralogic Composition

The stratigraphic column established for the Canastra Group, in the Alto Paranaíba region in the centralportion of the Brasília Fold Belt, represents a regressive megasequence of sediments deposited on an openseacontinental platform. The following units occur from base to top: a turbiditic sequence with arenaceousand argillaceous intercalations; an arenaceous sequence containing storm beds; and a clay-rich arenaceoussequence with structures reflecting shallow marine and tidal flat environments. The Ibiá Group overlies theCanastra Group on an erosional disconformity. Its base consists of a metadiamictite of glacial origin (CubatãoFormation) while the uppermost unit (Rio Verde Formation) comprises an extensive and monotonous packageof banded calcareous phyllites. The contact between these two formations is gradational and both units havesimilar mineralogic composition. The Canastra and Ibiá Groups were affected by a single event of progressivedeformation, E1, during the Brasiliano Cycle, manifested as two distinct compressional stages. The earliestand most compressive stage, D1, is represented by thrust tectonics, associated with greenschist faciesmetamorphism. The second stage of deformation, D2, is characterized by a dominant component of pureshear in a ductile-brittle regime. When compared with other similar units in the geochronological record, thecharacteristics of the studied units show that the Ibiá Group metadiamictites are contemporaneous with theJequitaí tillite, with a probable age of deposition between 900 and 1000 Ma and the Canastra Group istherefore older than 1000 Ma.

Origine des sables de deux coupes de plages des environs de la pointe de La Coubre (Charente-Maritime) et leurs variations mineralogiques en fonction des conditions meteorologiques

1950 ◽  
Vol S5-XX (4-6) ◽  
pp. 239-244
Author(s):  
Solange Duplaix
Keyword(s):  
Wind Direction ◽  
West Coast ◽  
The West ◽  
Mineralogic Composition

Abstract Although qualitatively the sands from two sections on the beach in the vicinity of Coubre point on the west coast of France showed a homogeneous mineralogic composition, quantitatively there was considerable variation, which is considered a function of the action of the sea and meteorologic conditions (wind direction and velocity). The sands are composed of material supplied by the Garonne and Dordogne rivers.

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