ÉTOILE FLAMBOYANTE (L’): : JACQUES TRESCASES: Books. La symbolique de la mort, ou, Herméneutique de la résurrection by Jacques Trescases(Book) 8 editions published between and in French and held. Jacques Trescases. Follow. Follow on Amazon. Follow authors to get new release updates, plus improved recommendations and more coming soon.

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V — Goldschmidt Abstracts Mineralogical Magazine.

Bauxites of the middle-eastern region [link] a Quadrilatero Ferrifero [link] b Cataguases [link] 3. In the lower part of the platy horizon, quartz is dissolved, sulfides are oxidized, micas are slightly altered and rhodochrosite changes into cryptomelane locally todorokitepreserving the micronodular structure of the carbonate.

When olivine is completely dissolved, the solutions of alteration become more diluted, pyroxenes change totally into smectites, that are more ferruginous and less magnesian than the former. Considering the chemical composition, this profile type has less aluminum and more silica than the previous one.

Alexa Actionable Analytics for the Web. Boehmite, as well as quartz, is rare and frequently absent. From the Neoaptian-Albian, these depressions were filled up with marine sediments. This massif forms a tfescases elongated body with 2. This rock is formed by the intercalation of fine layers of haematite and silex. It can be said that the Brazilian topography is a result of an evolution started in the Upper Cretaceous with the uplift of the South American Continent Braun, The urge to merge among companies has increased in recent years.

Other August 01, Learn more at Author Central. When two tiles with the same number touch, they merge into one. It is well known that the occurrence of the so-called lateritic deposits, formed mainly by rock weathering processes, depends on the convergence of a series of conditions, without which economical concentrations could never be formed Lelong et al.


The landscape similarity, tescases occurrence of silcrete on the higher surface and the existence of Tertiary laterites in the region suggest that Sao Joao do Piaui massif has had, in the Early Tertiary, an evolution process similar to that of other ultramafic massifs occurring from Para to Sao Paulo, with silicification and lateritization phases.

Its cover materials are thick and rich in iron and aluminum oxides over ultrabasic rocks silica is also common.

tresdases The study of a topographic sequence fig. Some factors influencing their formation. Everywhere, under the silcrete, the alteration profiles are similar to those developed in Goias, in zones with no silcrete.

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S — Profile section through Trombetas bauxite deposit after Gri’bb. A schematic profile presents, from top to bottom, the following sequence: The texture is generally fine lamellar, very porous, and may be locally nodular in the pyrolusite-rich phases.

The massif is intrusive in the Archean basement rocks and contains serpentinized zones in the northern, central and southern part dunites and peridotites separated by gabbro and pyroxenite zones. Secondary iron oxides give a red color to this material. Considering a typical profile, the following horizons can be observed from bottom to top: The serpentine is changed into smectite with progressive leaching of Mg and conservation of silica, as opposed to the lateritic evolution. I — Basic data about physical environment in Brazil.

National Library of Australia. In the lowlands, the profile is of the same type trescaess those described for the depressed areas of the highlands.

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High to Low Avg. Order a copy Copyright or permission restrictions may apply. This evolution starts at the borders and discontinuities of crystals, giving origin to a gibbsitic network preserving the original rock structure. Territorio Federal do Amapa. Illite may occur as trace, while halloysite, associated with ill-crystallized gibbsite or amorphous cliachitewas detected in some profiles. On the tops, the profiles are not well developed, the silcrete accumulation of silicified blocks covers.


In spite of the layered rock structure still visible, the rock is already friable and easily disaggregated, isolating its constituents. In the surface, the destruction of the plates is accelerated and pisolites are formed. Recently, Trijckenbrodt and Kotschoubey suggested an allochthonous origin, related to the deposition by means of mudflow. As to chemical composition, the itabirite alteration profile is characterized by an intensive desilicification with consequent iron accumulation.

It is a result of an in situ re-organization of haematite into goethite. Can I borrow this item? Full text of faculty publications and doctoral dissertations. The plateau profile, like the previous one, shows three main horizons, as follows:.

Jscques the evolution is in situ by deepening of the alteration under the silcrete which is very rare in Goias. The pisolitic material contains centimetric plate fragments, badly rounded, with a very thin cortex up to spheric pisolites 5 mm diameterwhere the nuclei are entirely taken by the cortex. Its cover materials have peculiar characteristics.