Timing, duration and role of magmatism in wide rift systems: Insights from the Jiaodong Peninsula (China, East Asia)

摘要: In East Asia, widespread extensional sedimentary basins together with the close association of Metamorphic Core Complexes and magmatism are prominent features large-scale wide rift system developed during late Mesozoic times. This region thus appears as a proper place to study continental extension well questions about link between magmatism. paper primarily provides pioneer exhumation time-constraints on Linglong MCC (Jiaodong Peninsula) including cooling deformation ages. at mid-crustal levels occurred ca. 143 Ma. Besides, last ductile 134 Ma while final stages, under brittle 2 conditions, 128 Continuous crustal stretching were then recorded by emplacement synkinematic pluton in upper crust that cooled fast below an intracrustal shear zone crossing ductile-brittle transition 123 The 120-118 age cluster is ascribed undeformed plutons marking end lasted, area, over minimum period 30 My. Combining other constraints onset subsidence basins, total duration Asia could be estimated 60 My, related rather long process for from 160 least 100 Asian heterogeneously distributed space time revealed fundamental differences two end-member classes migmatite-cored already described systems. Extension seems have first favoured partial melting which subsequently, turn, maintained extension.