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

弧盆地和弧后盆地火山系统的一个特征是，它们的熔岩成分截然不同，它们来自明显不同的地幔源。理解这些系统的一个问题是确定不同岩浆来源的类型和比例，从而形成岩浆的多样性。本项目将对活跃弧后扩张中心和灭弧进行系统采样，以更好地表征马里亚纳群岛弧下该震源的时空分布。要解决的基本问题是：在岛弧和后弧中形成岩浆的主要成分是什么，这些源如何在空间和时间上混合和相互作用，以及从这种混合中可以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?