中国东北新生代板内火山物质起源的数值模拟研究

The origins and dynamic geneses of intra-continental Cenozoic volcanisms in northeast China have not been interpreted and there are still controversies about these topics. This research project, basing on geophysical observation data, will perform a massively parallel finite element method combing Boussinesq fluid, visco-plastic mechanics and thermal evolution, and multi-field coupling, to simulate the process of dehydration and hydration of subducted slab and mantle transition zone, the interactions between subducted slab and mantle transition zone, the origin and the ascending of thermal material, the origin and migration of magma. The excepted research result may clarify the origin mechanism of Cenozoic intra-continental volcanisms in northeast China, material circulation and energy conversion and other deep processes, providing interpretations for space-time evolution characteristics of Cenozoic volcanisms in northeast China and structural setting of East Asia.

中国东北地区新生代板内火山的热物质起源和动力学成因尚未得到很好地解释且争议不断。本项目拟以东北地区深部地球物理探测资料为约束，开展以Boussinesq流体、粘塑性和热演化的多尺度、多场耦合的大规模高性能并行有限元数值计算，分析俯冲板片和地幔过渡带脱水和水化过程，探讨俯冲板片与地幔过渡带的相互作用，获得含水热物质的起源和上升过程及岩浆的形成和运移过程。进而厘定中国东北新生代板内火山热物质起源深度和物质来源，揭示其物质循环和能量转换等深部过程，为中国东北新生代火山的时空演化特征和东亚大地构造环境提供成因解释。