Original paper

Cyclic evolution of convergent plate margins indicated by time sequence of volcanism and subduction

Hanus, Vaclav; Vanek, Jiri

Global Tectonics and Metallogeny Volume 5 Number 3-4 (1996), p. 103 - 108

27 references

published: Jan 1, 1996

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Abstract

The time succession and migration of calc-alkaline volcanism in the regions of convergent plate margins is explained by a model presented in this paper. This model is based on (1) the assumption that calc-alkaline volcanism is generated primarily in the intermediate-depth aseismic gap of the subducted lithosphere; and (2) on the combination of the specific distribution and time sequence of volcanism with the geometry of the Wadati-Benioff zone in the Tonga region and Andean South America. The distribution of earthquake foci in subduction zones and the migration of calc-alkaline volcanism indicate that the process of subduction runs in cycles connected with the creation of a system of downgoing slabs descending successively in or against the direction of the ocean floor spreading. The cyclic evolution of convergent plate margins implicates a new interpretation of metallogenic processes in continental wedges overlying subduction zones.

Keywords

Cyclic evolutionvolcanismplate marginWadati-Benioff zoneSouth America