Temporal and Spatial Distribution of Enriched Mantle SourcesNorthern Mariana Arc System, Western Pacific

西太平洋北马里亚纳弧系丰富地幔源的时空分布

• 批准号: 8917585
• 负责人: Sherman Bloomer
• 金额: --
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917585&HistoricalAwards=false
• 关键词: Temporal; Spatial; Distribution; Enriched; Mantle

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 sourcs from that mixing?

弧和弧后盆地火山系统的一个特征是，来自明显不同的地幔来源的成分截然不同的熔岩紧密地并列在一起。理解这些系统的问题之一是确定不同来源的类型和比例，这些来源对岩浆的多样性有贡献。该项目将对活动的弧后扩张中心和灭绝的弧进行系统采样，以更好地反映马里亚纳群岛弧下这一源的时空分布。要解决的基本问题是：岛弧和弧后岩浆的主要成分是什么，这些源是如何在空间和时间上混合和相互作用的，从这种混合可以推断出源的几何形状是什么？