Subduction of oceanic lithosphere with chemical or topographic heterogeneities often results in collision and sometimes mountain building. Typical of this process is the arc-continent collision that built the mountain of Taiwan after the South China sea oceanic lithosphere was consumed. The extreme case of the subduction-collision process is the underthrusting of continental lithosphere, which is perceived to also occur beneath Taiwan. It is an open question as to how deep the Eurasian continent has plunged. The possible exhumation and slab breakoff are subjects of debate too for this region, while the detailed deformation of the slabs beneath Taiwan is yet to be established. On the geochemistry front, magmatic and isotopic characteristics have just begun to constrain the evolution of the subduction and its tectonic impact. This session is aimed to reevaluating existing evidence and hypotheses and promoting interdisciplinary interpretations of new evidence. It is also hoped to bridge the distances between geophysics, geochemistry, and geology and encourage interactions between different disciplines.