Multi-mechanism orogenic model of the Su-Jiao orogenic belt

The Su-Jiao orogenic belt is the eastern part of the Central Mountain Syste m of China. Recent studies on its orogenic system indicate that the Su-Jiao orogenic belt is a complex orogenic belt which suffered at least 3 orogeni es of different mechanisms in the Mesoproterozoic, Neoproterozoic and Trias sic respectively. The Meso-Neoproterozoic orogenies belong to the Wilson cy cle on the plate margins. The belt is a part of the Late Mesoproterozoic su percontinent Rodinia. The Triassic orogeny belongs to the re-orogeny of the non-Wilson cycle. Delamination of mountain roots occurred after both the W ilson and non-Wilson cycles in the Su-Jiao orogenic belt. The large-amplitu de isostatic uplift of mountains, magmatic activities and basin-forming and mountain-making in the upper crust, all indicate the general significance of delamination in the development of orogenic belts.