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

深海钻探项目在菲律宾海域发现的火山岩至少代表了四个弧后扩张阶段和两个火山弧建造阶段。这些样品的主要元素和微量元素研究表明，弧熔岩和盆地熔岩之间以及它们之间存在重要的化学差异。本奖项的目的是检查这些样品的铅、锶和钕同位素。这些数据将被用来确定较老的盆地和弧形熔岩之间的同位素变化程度，并确定地理趋势。这类信息对于确定有助于弧和盆地火山活动的地幔来源的组成范围以及了解弧-盆地系统的整体地球化学演化具有重要意义。这个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.