Analysis for multiple collision metamorphism in the orogenic belts in SE Asia : implication for supercontinent formation

本研究的目的是从东南亚多碰撞带中获得P-T-t条件。在印支-华南板块碰撞带中获得了很高的T、P值，表明该碰撞带曾发生过大陆俯冲。时代主要为晚二叠世。另一方面，在锡布马斯-印度支那碰撞带中没有发现俯冲的证据，它们的年龄比印度支那-华南碰撞带稍年轻。这些特征强烈地表明，在泛古陆形成时期，东南亚多个碰撞带存在明显的年龄差距和不同的碰撞体系。

Purpose of this study is to realize P-T-t conditions from the multiple collision zones in SE Asia. Very high-T and -P conditions were obtained from the collision zone between the Indochina and South China cratons, which indicate that deep continental subduction had occurred in this collision zone. The age mostly yielded the Late Permian. On the other hand, no evidences of the subduction were obtained from the Sibumas-Indochina collision zone, and their ages are little younger than that of the Indochina-South China collision. These characteristics strongly imply that there are significant age gap and different collision system in multiple collision zones in SE Asia during the Pangaea formation.