A Comparative Elemental and Isotopic Study of Seawater Component Assimilation on the East Pacific Rise (EPR) Using Volatiles, Halogens, Boron and Lithium

一种离子微探针，（二次离子质谱仪）研究卤素（Cl，F），挥发物（CO2，H2O，S）、轻元素（B，Li）及其相关同位素组成（7 Li/6Li，11B/10 B，34 S/32 S和37 Cl/35 Cl）将在东太平洋海隆（EPR）玻璃上进行，和15- 16 ° N区域。 海水成分沿沿着全球洋脊系统同化为玄武岩浆的现象可能比通常认为的更为广泛。 在快速扩张的海脊，如EPR，轴向岩浆房是明确的，这一过程可能是普遍存在的。 目前，人们对火山特征和岩石学分段的局部空间尺度上的海水成分同化过程了解甚少。 这项工作将使用不同的地球化学工具，每种工具对同化过程都有自己的反应，并将研究海岭系统的各个部分，在这些部分，可以识别出扩张速度、火山活动、岩石圈结构和轴向岩浆房形态的微小差异。本研究的目的是确定海水成分同化在海洋岩石圈中发生的方式和位置，将这一过程的程度差异与洋脊系统的火山和形态特征联系起来。

An ion microprobe (secondary ion mass spectrometer) study of the halogens (Cl, F), volatiles (CO2, H2O, S), light elements (B, Li) and their relevant isotopic compositions (7Li/6Li, 11B/10B, 34S/32S and 37Cl/35Cl) will be carried out on well-characterized East Pacific Rise (EPR) glasses from the 9 degrees N, 12 degrees N, and 15-16degrees N regions. Assimilation of seawater components into basaltic magma along the global ocean ridge system may be more widespread than is commonly assumed. At fast-spreading ridges such as the EPR where axial magma chambers are well-defined, this process may be ubiquitous. There is currently a poor understanding of the seawater-component assimilation process on the local spatial scale of volcanic features and petrologic segmentation. This work will use different geochemical tools, each with its own response to the assimilation process and look at segments of the ridge system where small differences in spreading rate, volcanic edifice, lithospheric structure and axial magma chamber morphology can be recognized. The purpose of this study is to determine how and where seawater component assimilation occurs in the oceanic lithosphere, to relate differences in the extent of this process to volcanic and morphologic features of the oceanic ridge system.