Collaborative Research: Lithium Isotopes in Mid-Ocean Ridge Hydrothermal Fluids: Determining Controls and Assessing the use of Lithium as a Geochemical Tracer

摘要 OCE- 9911612 OCE-0000882在海底热液系统中循环的海水在经历与周围海洋截然不同的高温和高压条件时会发生深刻的化学变化。因此，从海底喷出的热液水在成分上与其来源的海水明显不同，对某些元素而言，它是全球物质平衡的重要组成部分。为了理解这一过程，必须了解海底下反应的岩石/水比率。在这项工作中，锂同位素系统在大洋中脊热液系统将进行调查，因为锂已被发现是一个很好的工具，了解岩石/水的行为在海底系统。以前收集的热液流体的锂同位素组成将在已经分析了主要和次要元素以及锂浓度的样品上确定。这些样本来自大洋中脊系统沿着的四个不同地点。

ABSTRACT OCE- 9911612 OCE-0000882Seawater that circulates within submarine hydrothermal systems undergoes profound chemical change as it traverses high temperature and pressure conditions that are far different from those of the ambient ocean. Consequently, the hydrothermal water venting from the seafloor is markedly different in composition from the seawater from which it is derived, and for some elements represents an important component of the global mass balance. To understand this process, the rock/water ratio of reactions beneath the seafloor must be understood. In this work, Li isotope systematics in mid-ocean ridge hydrothermal systems will be investigated because Li has been found to be a good tool for understanding the rock/water behavior within the seafloor systems. The Li isotopic composition of previously collected hydrothermal fluids will be determined on samples that have already been analyzed for major and minor elements and for Li concentration. These samples are from four different sites along the mid-ocean ridge system.