Focusing on Freezing: A Joint Proposal to Investigate a Novel Mechanism for Lateral Melt Migration at Mid-Ocean Ridge

这项研究的目的是量化大洋中脊下熔体横向迁移的机制，即冰冻引起的熔体通道。初步结果表明，岩石圈倾斜底部附近的快速冻结可能导致高渗透性熔体通道的形成，这些通道允许熔体向山脊轴迁移。剩下的问题是：(1)控制这个过程的基本参数是什么？(2)地球上有没有通道？(3)这个过程的效率是多少？(4)大洋中脊火山活动的体积、时间和化学的可观测结果是什么？通过将高分辨率的二维岩浆迁移程序与大规模的地热和地幔流动模型相结合，将研究一系列系统的问题来解决这些问题。

The purpose of this research is to quantify a mechanism for lateral melt migration beneath mid.ocean ridges; namely freezing induced melt channeling. Preliminary results suggest that rapid freezing near the sloping base of the lithosphere may lead to the fromation of high permeability m lt channels that allow melt to migrate to the ridge axis. The questions remaining are: (1) What are the fundamental parameters that control the process? (2) Are channels expected in the earth? (3) What is the efficiency of this process? (4) What are the observable consequences for volume timing and chemistry of mid.ocean ridge volcanism? By combining high resolution 2.D magma migration code with large scale thermal and mantle flow models, a systematic series of problems will be investigated to address these questions.