Abstract
The P–T paths for metamorphic complexes from the Precambrian shields and fold belts of different ages may result from advection, i.e. one‐cycle convective processes in the lithosphere. This conclusion has been exemplified by the metamorphic evolution of several well‐known complexes, for which an advective model can be successfully applied. Numerical simulations of the above processes in terms of Newtonian rheology by using a two‐dimensional finite element program have been conducted.Two representative models for intracontinental gravitational ordering initiated presumably by mantle activity are considered: (i) a thermally activated multi‐layered rhythmic sequence and (ii) huge rising diapiars causing circulation, in which crustal lithologies underwent high‐P metamorphism (above 10–15 kbar) and subsequent ascent toward the Earth's surface.
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