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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Nickeliferous laterite profiles from New Caledonia Troly et al. A great variety of climates can be found in Brazil as a consequence of its continental dimensions. These massifs form generally high plateaus, sometimes with more than trescses above the surrounding area. This chapter will present briefly the lithological, climatic and morphological conditions in Brazil.
Bauxites of the southeastern region. Besides the Quatipuru ore deposit Cordeiro and McCandless,only the Vermelho deposit Carajas has been prospected and is well studied in jacqus latest years Bernardelli et al.
Geological and geochronological data have allowed to identify, in the Brazilian part of the South American Platform, several orogenic cycles and thermotectonic or tectono-magmatic events, with either a continental or a local importance.
On the other hand, the role of topography is well marked.
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Ore deposition occurred at a low pH, indicated by the complete alteration of the host rocks into a quartz-illite association, and at a low f sub O 2 intermediate between the f sub O 2 fixed by the hematite-magnetite and Ni-NiO oxygen buffers. Other August 01, Central Brazil Goias ore deposits [link] a The alteration profiles [link] b Mineralogical and chemical composition [link] c General interpretation [link] 2.
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The haematite is still fresh, loosing only its characteristic brightness. Similar Items Des ailes dans les alizes: Considering the chemical composition, this profile type has less aluminum and more silica than the previous one.
Trescases – Names Encyclopedia
Uranium, Vandoeuvre les Nancy, France. Downwards, the bauxite becomes denser and may contain blocks of weathered rock. The products of the weathering of various rocks constituted very important bauxite deposits: Ultrabasic rocks — New Caledonia.
There are no important variations in the deposits characteristic of the more humid coastal zones Esson and Surcan, ; Trexcases and Oliveira, and those of Central Brazil tropical zone with contrasting seasons. Ore fluids are characterized by an aqueous composition, a rather low salinity, and temperatures ranging from degrees to degrees C. It can be said that the huge iron deposits do not present, actually, a jacqus control in Brazil, and if they are associated with Eocene levelling surface this is simply the result of the slowness of the total desilicification mechanism.
A — Geologic outline of lateritic deposits. Quadrilatero Ferrifero, due to its proximity to the siderurgical center, and Cataguases, due to the important reserves recently found. Can I get a copy? In the zones of steep slope, the intense internal drainage leads to the formation of homogeneous bauxitic profiles. Table VI summarizes the main characteristics of the most important Brazilian ore deposits, which total reserve of lateritic nickel exceeds 4 x ton of Ni.
The protore was observed only from drill-holes and it presents two manganesiferous levels intercalated with a Mn-poor layer fig.
Statistics and meaning of name Trescases
As a consequence, they are better known when compared with the small deposits jacquues the Northeast and Goias. L’evolution geochimique supergene des roches ultrabasiques en zone tropicale: There the evolution scheme is simpler than in Goias, because no nickel migration occurs from an older levelling surface to a more recent one.
The lateritic ore deposits of Brazil 25 2. General features [link] 2. You must be logged in to Tag Records. Metamorphosed silico-carbonatic protores alteration The evolution of recrystallized rhodochrosite in the metamorphosed carbonatic protores is similar to that described for Jacquee deposit.
Trescases, Jacques [WorldCat Identities]
Grubb suggested a polygenetic origin, with several jacqufs steps:. Constraining magmatic fluxes through thermal modelling of contact metamorphism Chemical, Physical and Temporal Evolution of Magmatic Systems. The massifs are constituted of a syenitic sequence with subsatura-ted to saturated terms, being either intrusives or extrusives.
Alexa Actionable Analytics for the Web. Trescses, it must be emphasized that the genesis of all lateritic ore deposits involves a very slow process, which occurs during a long period of time, and typically since the Early Tertiary.
The lateritic ore deposits of Brazil 1 I — Basic data about physical environment in Brazil This chapter will present briefly the lithological, climatic and morphological conditions in Brazil.
Previous Article Next Article. Nevertheless, the exploitable ore is generally a result of a protore lateritic alteration carbonatic, silico-carbonatic or silicatic protore, according to the metamorphic processes.