Temporal and Spatial Distribution of Enriched Sources, Northern Mariana Arc System, Western Pacific

弧和弧后盆地火山系统的一个特征是 成分完全不同的熔岩的近距离沉积 它们显然来自不同的地幔源。之一 理解这些系统的问题是定义类型 以及不同来源的比例 岩浆的多样性该项目将系统地采样 活动弧后扩张中心和消亡弧， 更好地反映人口的时空分布， 马里亚纳群岛弧下的这个源头基波 要解决的问题是：什么是主要组成部分 对岛弧和弧后的岩浆有贡献，这些 源在空间和时间上混合并相互作用， 从混合中推断出源的几何形状？

One feature of arc and back-arc basin volcanic systems isthe close juxtoaposition of lavas of radically different compositions that are derived from apparently different mantle sources. One of the problems in understanding these systems is defining the types and proportions of different sources contributing to that diversity of magmas. This project will sysematically sample the active back-arc spreading center and the extinct arc to obstain a better representation of the temporal and spatial distribution of this source beneath the Marianas Islands arc. Fundmental questions to addressed are: what are the principal components contributing to magmas in island arcs and back-arcs, how do these sources mix and interact spatially and temporally, and what can be deduced about the geometry of the sources from that mixing?