Collaborative Research: A Quantitative Study of Reaction Pathways in Oceanic Serpentinites

合作研究：大洋蛇纹岩反应途径的定量研究

• 批准号: 2214207
• 负责人: Frieder Klein
• 金额: $ 47.89万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2214207&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantitative; Study; Reaction

The alteration of seafloor mantle rocks by seawater (referred to as serpentinization) is a widespread process. It affects global chemical cycles, earthquake potential, and possibly the origin of life. However, the process of serpentinization remains poorly understood. This work will conduct laboratory experiments to enable a better understanding of the underlying processes of serpentinization. The results will improve models and allow scientists to better interpret altered mantle rocks and fluid compositions. This project provides student training in geological oceanography, petrology, and aqueous geochemistry. To broaden participation in science, the researchers will involve undergraduate students from underrepresented minorities in this project. The students will be offered training in project design, sample analysis, data interpretation and presentation of results. Results of this project will be broadly disseminated through open access manuscripts, at international conferences, and workshops, and as well as through seminars, and teaching.It is hypothesized that distinct dissolution rates of minerals that constitute mantle rocks are decisive in controlling the fluxes of elements from the mantle rock and, therefore, in controlling the timing of secondary (hydrothermal) mineral formation events which dictate the temporal evolution of physical rock properties and compositions of vent fluids. To test this hypothesis, this work aims at systematically exploring the succession of chemical reactions recorded in altered mantle rocks by integrating chemical, isotopic, and quantitative mineralogical analyses with theoretical modeling. Chemical compositions, as well as mineralogical maps of partially altered mantle rocks will be used to reconstruct the original proportions of mantle minerals. By comparing mineral abundances of fresh and reacted rocks, relative dissolution rates and chemical fluxes will be inferred. To reconstruct the sequences of chemical reactions, abundances of minerals will be co-registered with the overall extents of alteration. Results from previous studies will be applied to determine the effect of temperature on the succession of dissolution-precipitation reactions. The analytical outcomes of this study will inform theoretical models that will take rock compositions, alteration temperature, surface areas, and distinct dissolution rates of minerals into account. By systematically varying the individual input parameters, these models will be developed that match the rock record. These models will then provide detailed insight on the evolution of fluid compositions associated with specific combinations of rock compositions, alteration temperatures, and mineral assemblages.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

海水对海底地幔岩石的改变（称为蛇纹石化）是一个广泛的过程。它影响全球化学周期，地震潜力，甚至可能是生命的起源。但是，蛇纹石的过程仍然很少了解。这项工作将进行实验室实验，以更好地了解蛇形化的基本过程。结果将改善模型，并允许科学家更好地解释改变的地幔岩石和流体成分。该项目提供了地质海洋学，岩石学和水性地球化学的学生培训。为了扩大对科学的参与，研究人员将参与该项目中代表性不足的少数群体的本科生。将向学生提供项目设计，样本分析，数据解释和结果介绍的培训。该项目的结果将通过开放访问手稿，国际会议和研讨会，以及通过研讨会以及教学来广泛分解。假设，构成地幔岩石的矿物质的明显溶解速率是决定了构成元素的元素的范围，从而指示了临时范围的临时元素，从而指示了临时的范围，从而使得临时的范围（均为临时性），该元素是临时的，这些元素是在范围内的临时范围，这些元素是有序的。排气流体的物理岩石特性和组成。为了检验这一假设，这项工作旨在系统地探索通过将化学，同位素和定量矿物学分析与理论模型整合到改变的地幔岩石中记录的化学反应。化学成分以及部分改变的地幔岩石的矿物学图将用于重建地幔矿物的原始比例。通过比较新鲜和反应岩石的矿物质丰度，将推断相对溶解速率和化学通量。为了重建化学反应的序列，将与整体变化的整体范围共同注册了丰富的矿物质。先前研究的结果将应用于确定温度对溶出性溶解反应的连续性的影响。这项研究的分析结果将为理论模型提供信息，这些模型将考虑岩石成分，变化温度，表面积和矿物质的不同溶解速率。通过系统地改变各个输入参数，将开发这些模型与岩石记录匹配。然后，这些模型将提供有关与岩石成分，变化温度和矿物组合有关的特定组合相关的流体组成演变的详细见解。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的审查标准通过评估来通过评估来支持的。