Magmatic Water along the Central American Arc

根据这项奖励，PI将提供哥斯达黎加火山岩浆水含量的主要数据集。中美洲弧区的现有模型要求尼加拉瓜比哥斯达黎加火山有更大范围的水循环。在这个项目中，PI将通过离子和电子探针测量橄榄石熔体包裹体中的挥发性浓度(H2O、CO2、S、氯、F)。另一个重点将是开发新技术，一个是基于单斜辉石中记录的稀土元素模式的湿度计，另一个是基于单斜辉石中的H2O浓度的湿度计。投资促进机构建议为哥斯达黎加-尼加拉瓜弧区的水含量提供一个全面的数据集，包括大约。20座弧形火山。这将允许对现有的地球化学梯度以及地震成像的结果进行严格的测试，并对数据进行解释。这项研究涉及一名女研究生，涉及广泛的边缘工作者社区感兴趣的数据集。

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.