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基于IODP建议书697-Full3号,IODP350航次的目的是通过对菲律宾海沉积物和基岩的钻探,获取长时间弧后岩浆成分的变化数据,进而了解伊豆-小笠原-马里亚纳(IBM)弧后体系的地壳形成和演化(图1)。3个主要理论将得到检验:(1)弧后体系地球化学不对称地壳要么是一个最基本的特征或弧后扩张发展过程中的一个次要特征;(2)不稳定状态的事件,如裂谷在岛弧地壳进化中发挥了重要作用;(3)伊豆弧后海山链的起源与地幔对流模式。
Based on IODP Recommendation 697-Full 3, the purpose of the IODP 350 voyage is to obtain data on changes in magmatic composition over a long period of time following drilling over the Philippine Sea sediments and bedrock to gain insight into the IBM-Ogasawara-Mariana (IBM) Post-system crustal formation and evolution (Figure 1). The three main theories will be examined: (1) The post-arc geochemical asymmetry crust is either a fundamental feature or a secondary feature in the development of an arc-backstretch; (2) events in unstable conditions such as fractures The valleys played an important role in the evolution of the island arc crust; (3) The origin and mantle convection pattern of the Houhai chain in the Izu Arc.