Elemental Fluxes Through the Central American Arc

9406624 Carr的目标是完成DSDP 495的地球化学地层学，并合作分析中美洲沿岸未来计划使用的JOIDES岩心；测定火山锋面元素通量随时间的变化；确定弧后地区俯冲分量的范围；描述了预交代地幔楔的特征。为了实现这些目标，PIs计划在危地马拉Moyuta-Tecuamburro段的过去2-4万年的样品中获取大量的微量元素和同位素数据；测定后弧熔岩的B、Be和10Be；扩展了前人提出的弧前、弧后熔岩的区域铅同位素研究。

9406624 Carr Objectives are to complete the geochemical stratigraphy of DSDP 495 and to collaborate in the analysis of JOIDES cores planned for the future along the coast of Central America; to determine the variation with time of the elemental fluxes at the volcanic front; to ascertain in the extent of subduction components in the back arc region; to characterize the pre-metasomatized mantle wedge. To accomplish these goals, PIs plan to acquire extensive trace element and isotopic data on sample spanning the last 2-4 my in the Moyuta-Tecuamburro segment of Guatemala; to determine B, Be and 10Be on lavas in the back arc; and to extend the regional Pb isotopic study of volcanic front and back arc lavas begun in the previous proposal.