Offshore-onshore tectonomagmatic correlations: Towards a Late Mesozoic non-Andean-type Cathaysian continental margin

Although much evidence points to a Late Mesozoic large silicic igneous province in SE South China (SESC), diverse Andean-type and non-Andean-type models have been proposed explain its origins. New age, isotope, trace element data on zircon from wells East Sea (ECS) offshore-onshore tectonomagmatic comparisons allow reassessment of the geodynamic interactions (ca. 200–86 Ma) between Cathaysia-based arc intraplate activity mantle wedge framework. In region, remnants West ECS arc, Ryukyu-Taiwan mélange, SESC define trench–arc–intraplate architecture. Changes magmatic states (flare-ups lulls; high U/Yb, low T, variable ?Hf(t)) permit identification cycle initiation, thickening, decline, arc-root removal, migration, highly correlating with changes Izanagi subduction beneath Asia. Voluminous magmatism operated response slab stagnation dynamics: dehydration, lithospheric delamination, fluid-fluxed crustal anataxis, crustal–mantle melt hybridization hot zones. Such scenarios, unlike an continental margin, instead result construction Cathaysian-type active margin.