Serpentinite petrology as a key to understanding peridotite-seawater interactions in different submarine geotectonic settings

本提案寻求资金，对大洋中脊、大陆裂谷边缘和弧前背景下的海洋蛇纹岩进行系统和全面的研究。次生矿物的组成和组合将作为蛇纹岩化过程的指南。相岩石学和地球化学反应路径建模将用于读取蛇纹岩中存储的信息，包括系统的气体流通量、粒间流体的溶质活度、温度和总水通量。岩石成分的作用将被明确地指出。这些结果将为蛇纹石化过程及其对氢气（即微生物的食物）产生的影响以及蛇纹石化过程中岩石物性演化提供无与伦比的新见解。这项工作将是对第209号腿蛇纹岩研究的扩展，该研究为蛇纹岩化过程提供了许多新的见解。采用这种方法并将其应用于许多其他地点是合乎逻辑且及时的步骤，因为岩石学描述和岩石物理数据表明，蛇纹岩化过程中的反应路径变化非常大。

This proposal seeks funds to conduct a systematic and comprehensive study of oceanic serpentinites from mid-ocean ridge, continental rifted margin, and fore arc settings. The composition and associations of secondary minerals will be used as a guide to serpentinization processes. Phase petrology and geochemical reaction path modeling are going to be used in reading the messages stored in serpentinites in terms of gas fugacities of the system, solute activities of intergranular fluids, temperature and overall water flux. The role of the rock composition is going to be explicitly addressed. The results are going to provide unparalleled new insights into the process of serpentinization and its consequences for hydrogen (i.e., food for microbes) production, and petrophysical property evolution during serpentinization. The work is going to be an expansion of studies conducted in serpentinites from Leg 209, which provided many new insights into serpentinization processes. It is a logical and timely step to take this approach and apply it to many other sites, since petrographic descriptions and petrophysical data indicate that the reaction pathways during serpentinization are incredibly variable.