Geographic and Temporal Geochemical Variations in Volcanic Rocks from the Philippine Sea

深海钻探项目从菲律宾海回收的火山岩代表了至少四个弧后扩张阶段和两个火山弧形成阶段。对这些样品进行的主要元素和微量元素研究，描绘了弧熔岩和盆地熔岩之间的重要化学差异。本奖项的目的是检查这些样品的铅、锶和钕同位素。这些数据将用于确定较老的盆地和弧熔岩之间同位素变化的程度，并确定地理趋势。这些信息对于确定形成弧和盆地火山作用的地幔源的成分范围以及理解弧-盆地系统的整体地球化学演化具有重要意义。本项目将在一所本科院校进行。

Volcanic rocks recovered by the Deep Sea Drilling Project from the Philippine Sea represent at least four stages of back- arc spreading and two episodes of volcanic arc building. Major and trace element studies of these samples have delineated important chemical differences between and among arc and basin lavas. The objective of the present award is to examine the lead, strontium and neodymium isotopes of these same samples. These data will be used to determine the extent of isotope variation among older basin and arc lavas and to identify geographic trends. Such information is important in defining the compositional range of mantle sources that contribute to arc and basin volcanism over time and in understanding the overall geochemical evolution of the arc-basin system. This project will be undertaken at an undergraduate institution.