Abstract
General synthetic views, developed recently, which link geodynamics phenomena to major chemical fractionation are briefly reviewed. No complete demonstration or argumentation is given here as the main purpose is to describe this new approach itself. After an introduction on Sr-Nd isotope geochemistry, the continental pumping model and the models of mantle structure are reviewed. Continental growth is also discussed with special emphasis on continuous-growth vs recycling processes. Then, the problems of the continental lithosphere, its thermal accretion and geochemical consequences are investigated. Using the Sr-Pb correlation, the lead isotope anomalies are interpreted in terms of a core-pumping model. The general problem of the convecting fractionating mantle is ultimately discussed with respect to mantle heterogeneities.
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