Abstract
The term fault-block mountains refers to an orogen, formed in an ensialic back arc by extension. The voluminous magmatism due to underplating of hot oceanic lithosphere, extrem thinning of the continental lithosphere and partial melting as well as mantle diapirs will be examplified by three ore provinces: 1. Southwestern North America (Middle Tertiary peralkaline ignimbrites and resurgent cauldrons) 2. Central Iran (Infracambrian ignimbrites and riebeckitegranite) 3. Arabian Shield (Infracambrian alkaligranites and rhyolites, 625-570 m.y.).
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