fig28.htm

Figure 28. Schematic Early Paleoproterozoic intraplate tectonics of the Baltic Shield: 1 - spreading heads of superplumes; 2 - regions of sagging movements where excess crustal material accumulated and granulite belts were formed; 3 - sedimentary basins; 4 - magma-generation zones: in the mantle (a) and in granulite belts (b); 5 - underplating beneath rifts; 6 - newly formed lower crust in granulite belts; 7 - garnetized spinel peridotite under granulite belts; 8 - ancient continental crust; 9 - ancient lithospheric spinel peridotite; 10 - ancient garnet peridotite


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