Magmatic Water along the Central American Arc

根据该合同，PI将提供哥斯达黎加火山岩浆水含量的主要数据集。现有的中美洲弧模型认为尼加拉瓜的水循环比哥斯达黎加的火山要大。在这个项目中，pi将通过离子和电子探针测量含有橄榄石的熔融包裹体中的挥发性浓度（H2O, CO2， S, Cl， F）。另一个重点将是发展新技术，其中一个是基于斜辉石中记录的稀土元素模式的湿度计，另一个是基于斜辉石中H2O浓度的湿度计，这在一定程度上是由于哥斯达黎加tephra缺乏丰富的橄榄石。ppi建议提供哥斯达黎加-尼加拉瓜弧形区域水含量的综合数据集，其中包括大约。20座弧火山。这将对现有的地球化学梯度、地震成像结果和数据解释的发展进行严格的测试。该研究涉及一名女研究生，并涉及一组对广大边际工作者感兴趣的数据。

Under this award, the PI will provide a primary data set for magmatic water contents for Costa Rican volcanoes. Existing models for the Central American arc call for greater extents of water recycled to Nicaraguan than Costa Rican volcanoes. In this project the PIs will measure volatile concentrations (H2O, CO2, S, Cl, F) in olivine-hosted melt inclusions, by ion and electron probe. Another focus, partly driven by the lack of abundant olivine in Costa Rican tephra, will be the development of new techniques, one a hygrometer based on the rare earth element pattern recorded in clinopyroxenes, and the other based on the H2O concentration in clinopyroxenes. The PIs propose to provide a comprehensive dataset for water contents along the Costa Rica-Nicaragua arc sector, including approx. 20 arc volcanoes. This will enable rigorous testing against the existing geochemical gradients, as well as results of seismic imaging and the development of interpretations of the data.The study involves a female graduate student and involves a data set of interest to a broad community of MARGINS workers.