At present there is considerable speculation concerning the origin of greenstone belts. They are compared with Phanerozoic geosynclines, fold belts, modern island arcs or with the rift structures formed above subduction ...
The study of synmetamorphic granites of the Ol'khon collisional system revealed the abundance of injection veins, dikes, and intrusions. Their emplacement was controlled by ductile strikeslips that postdate and occasionally ...