Molluscs as Recorders of Ridge Volcanism and Hydrothermal Vent Field Activity

该项目将分析从东太平洋海隆喷口地点采集的双壳类中的稳定同位素和微量元素。水温(锶、镁、氟)和流体化学(金属)的潜在示踪剂将用离子微探针分析，18O用质谱仪分析，并与附近时间序列研究中收集的水样进行比较。将评估分配系数，并将使用放射性测年来确定增长率。目标是确定双壳类作为大洋中脊热液系统十年至世纪时间尺度上温度和流体化学变化的记录的效用。如果成功，这将提供一种工具来评估喷发的时间变异性，并估计地球化学通量的热液成分。

This project will analyze stable isotopes and trace elements in bivalves collected from vent sites on the East Pacific Rise. Potential tracers of water temperture (Sr, Mg, F) and fluid chemistry (metals) will be analyzed by ion microprobe, with 18O analyzed by mass spectrometry, and compared with water samples collected in time-series studies nearby. Partition coefficients will be evaluated, and radiometric dating will be used to determine growth rates. The goal is to determine the utility of bivalves as a record of temperture and fluid chemistry variations on decade to century time scales at mid-ocean ridge hydrothermal systems. If successful, this will provide a tool to asses temporal variability of venting, and to estimate the hydrothermal component of geochemical fluxes.