Global geochemical cycles (6 ects) | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS


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  Global geochemical cycles (6 ects)

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The course global geochemical cycle is given in English and addresses three major topics related to “GLOBAL GEOCHEMICAL CYCLE”.
The first part of this course will focus on the global geodynamic cycles of volatile elements like C, H, N and S. Contrasting with the cosmochemical view, a volatile element will be considered here as an element strongly partitioned into the vapor phase of a melt and is thus degassed to the atmosphere-ocean system during magma eruption. A part of this element can be transferred back to the mantle via subduction zone processes.
The second one looks into the cycle of major and trace elements in the critical zone. It focuses on Earth’s surface processes and the way they play a role in the geochemical cycles of elements. It uses chemical potamology, i.e. the geochemistry of rivers, as a way to understand the global role of chemical weathering in the Earth’s chemical engine. River biogeochemistry is used to understand the global cycle of the elements before human influence.
The third one focuses on the effect of the human influence on the cycle of heavily impacted metal ions or metalloids. One of the most obvious effects of human activity on the environment is chemical contamination from anthropogenic sources. The large amounts of industrial pollutants that have been introduced into the air, soil and water over decades have caused changes in the natural elementary cycle. Anthropogenic contamination generally leads to enrichment in several elements, in particular in industrial areas. Thus, some elements and their isotopes can be used as geochemical tracers of anthropic impact.


Compétences visées : 


Master tools of elemental and isotopic geochemistry. Several techniques for measuring precise isotopic abundances in natural materials (C, S, N, B, Li, Zn, Mg) and applied these techniques to study rainwater, river water, soils, sediments, rocks will be known from a theoretical point of view.
The methods used by geochemists to assess the extent of anthropogenic influence on the environment will be aquired. They include isotope geochemistry of (Pb, Zn…), speciation calculations of anthropogenic influence on the environment (Zn, Cu, As…). Determination of contamination factors, geo-accumulation index.


Pré-requis : 


Knowledge in geochemistry, chemistry, geosciences.


Évaluation Session 1 CC : 
Évaluation Session 2 CT : 
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