Metallogeny

The metallogeny studies the mechanisms of formation of the metalliferous Gisement S and proposes to define methodological tools and guides of prospection usable by the mining explorers and prospectors.

Metalliferous lodgings and mechanisms of formation

slickenside Lodgings (most current): hydrothermal origin, various metals according to the temperature.
sedimentary Lodgings (current):

Cementing (illuvial zone ): with the top of a layer and in relation to the piezometric Niveau there is partly higher Oxydation (iron) and Réduction in lower part (Sulfure S).
Substitution: creation of layers by Métasomatose for example in limestones or sandstones in the vicinity of seams.
Disintegration and deterioration: the bed rock is faded forming residual layers of éluvion S. Exemple Nickel of New Caledonia, Aluminum of the Bauxite S and oolitic iron (of chimico-biological origin).
To place S (detrital or alluvial): often result from transport by waters running (gold).

Lodgings of contact: in the zones of Metamorphism and sedimentary rocks. One finds Cuivre, Fer, Zinc, Or and Argent.
magmatic Segregations: the heavy materials separating according to their density will form a deposit in the magma.

Example: important layers of Canadian Nickel, following a probable meteoritic impact with the Precambrian .

pegmatitic Layers (few metals): the Pegmatite S are a magmatic differentiation associated with phenomena of dissolution (by water, of the Halogène S like the Fluor and the Chlore, the Bore). It is the case of the Wolframite and the Cassitérite for example.

Prospection

chemical Analysis of water: description of the tracer S.
Magnetometry

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