SGER: A Novel Approach to Evaluate Hydrothermal Fluid Interaction with Injected Magma Dykes at Mid-Ocean Ridges Using Radium Isotopes

摘要/ ABSTRACT摘要：利用放射性同位素评价洋中脊热液流体与注入岩浆岩脉相互作用的新方法本研究将尝试建立一种新的同位素示踪剂的分析和地球化学基础，利用热液喷口水组成变化所反映的228/226Ra来确定海底岩浆侵入物的侵位时间。它将使用经典的计数技术，以及尝试和开发一种方法，允许通过热电离质谱测量这些比率。这项工作将使用已经从冰岛、东太平洋隆起和胡安德富卡山脊的奋进部分收集的热液喷口流体的时间序列样本。这项工作将支持佛罗里达州迈阿密大学和夏威夷大学的研究人员。更广泛的影响：本提案为开发海底岩浆事件的新型热液喷口流体示踪剂提供了支持。它还支持开发新的分析工具，通过热电离质谱法测量流体中低水平的Ra。研究结果将被纳入迈阿密大学（RSMAS）的本科海洋学课程。

ABSTRACT Kadko 0554904SGER: A novel approach to evaluate hydrothermal fluid interactions with injected magma dykes at mid-ocean ridges using radium isotopesThis research will try and establish the analytical and geochemical foundation for a new isotopic tracer for determining the time of emplacement of subseafloor magmatic intrusions using 228/226Ra as reflected in changing compositions of hydrothermal vent waters. It will use both classical counting techniques as well as try and develop a method to allow these ratios to be measured via thermal ionization mass spectrometry. The work will used already collected time series samples of hydrothermal vent fluids from Iceland, the East Pacific Rise, and the Endeavor Segment of the Juan de Fuca Ridge. This work will support researchers at the University of Miami in Florida and the University of Hawaii.Broader Impacts: This proposal provides support to develop a new hydrothermal vent fluid tracer of subseafloor magmatic events. It also supports the development of new analytical tools to measure low levels of Ra in fluids by thermal ionization mass spectrometry. Results will be incorporated into undergraduate oceanography courses at the University of Miami (RSMAS).