台灣碰撞帶的隱沒作用
Subduction processes in the Taiwan collision zone
議題說明:

海洋岩石圈上的異常構造往往造成碰撞甚至造山。台灣的弧陸碰撞便是典型,有時大陸岩石圈也隨之俯衝。在台灣,歐亞大陸地殼到底俯衝了多少仍是個謎。地殼回升與板塊脫落也常被討論,但仍有爭議。地球化學之證據也剛開始對台灣附近的隱沒作用提供了新的限制條件。我們希望能檢驗過去的證據和假說,也同時鼓勵對新證據進行綜合解釋。此一子題希望能促進地物、地化和地質之間的互動。


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.