Magmatic Evolution of Mauna Loa Volcano

9614754罗兹该项目的主要目的是提供洞察夏威夷地幔柱内的岩浆生成过程中使用的样品的地球化学和同位素组成莫纳罗亚，火山与最好的记录史前喷发地质年代学之一。 这一目标将通过完成以前用14C分析过的莫纳罗亚山一组样品的地球化学数据库来实现。 该提案的目的是利用这一独特的记录来提供莫纳罗亚火山喷发历史中长期和短期地球化学变化的详细记录。 这一信息将允许在喷发记录中确定岩浆供应率似乎发生了巨大变化的周期性活动时期。 根据X射线荧光分析仪数据选定的关键时期的样品，将由国家原子能机构分析其他微量元素，并分析Sr和Pb同位素组成。 这项工作的结果将用于从短期数据中看到的角度评估长期的地球化学和同位素趋势，并回答羽流源随时间推移的性质和演变问题。

9614754 Rhodes The primary aim of this project is to provide insights into the processes of magma generation within the Hawaiian mantle plume using the geochemical and isotopic composition of samples from Mauna Loa, a volcano with one of the best-documented prehistoric eruptive geochronologies. This goal will be achieved by completing the geochemical database on a group of samples from Mauna Loa that have been previously analysed with 14C. The intent of this proposal is to utilize this unique record to provide detailed documentation of both long- and short-term geochemical variations in Mauna Loa's eruptive history. This information will allow the determination of periods of cyclical activity in the eruptive record where the magma supply rate appears to have changed dramatically. Samples from critical periods, selected on the basis of XRF data, will be analysed for additional trace elements by INAA, and for Sr and Pb isotopic compositions. The results of this work will be used to evaluate long-term geochemical and isotopic trends from the perspectives seen in the short-term data, and to provide answers to questions of the nature and evolution of the plume source over time.