Collaborative Research: Serpentinization and cycling of B, Nd and Sr in submarine hydrothermal systems: An experimental study on the effects of pH and temperature

合作研究：海底热液系统中 B、Nd 和 Sr 的蛇纹石化和循环：pH 和温度影响的实验研究

• 批准号: 0928280
• 负责人: Michael Bizimis
• 金额: $ 17.4万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0928280&HistoricalAwards=false
• 关键词: Collaborative; Research; Serpentinization; cycling; Nd

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Hydrothermally altered ocean crust provides a record of heat and mass transfer between seawater and the earth's mantle that takes place during hydrothermal circulation at mid ocean ridges and subduction zones. Hydrothermal vent systems that generate the mineral serpentine are linked to alkaline fluids enriched in organics and are central to generating the energy supply for microbial life at the seafloor. This research uses boron, strontium, and neodymium elemental concentrations as well as boron isotope fractionation to examine the role of water-rock reaction in the conversion of peridotites and other ultramafic rocks common on the seafloor and in the lower crust to serpentine and other minerals. The work involves novel, controlled, hydrothermal, laboratory experiments that examine the pH, temperature and mineral composition controls on boron isotope fractionation and combined B-Sr-Nd mobility and rock-fluid exchange. Targeted geochemical elements were picked because they are recorders of temperature and fluid pH conditions and allow application of the results of the experiments to fossil hydrothermal systems and associated ore deposits. Furthermore, the measurements will constrain the effects of low-temperature serpentinization on the efficiency of elemental recycling across volcanic arcs and enhance our understanding of geochemical fluxes from subducting slabs which impact island arc volcanics. Broader impacts of the work are support of two early career researchers, promotion of a new collaboration, support of students, international collaboration, and support of an institution in an EPSCoR state

该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。热液改变的海洋地壳提供了在洋中脊和俯冲带的热液循环期间发生的海水和地幔之间的热量和质量传递的记录。产生蛇纹石矿物的热液喷口系统与富含有机物的碱性流体有关，是为海底微生物生命提供能量的核心。这项研究使用硼、锶和钕元素浓度以及硼同位素分馏来研究水-岩石反应在橄榄岩和海底和下地壳中常见的其他超镁铁质岩石转化为蛇纹石和其他矿物的过程中的作用。这项工作涉及新颖的受控水热实验室实验，检查 pH 值、温度和矿物成分对硼同位素分馏以及 B-Sr-Nd 迁移率和岩石流体交换的综合控制。选择目标地球化学元素是因为它们是温度和流体 pH 条件的记录器，并允许将实验结果应用于化石热液系统和相关矿床。此外，这些测量将限制低温蛇纹石化对火山弧元素循环效率的影响，并增强我们对影响岛弧火山的俯冲板片地球化学通量的理解。这项工作的更广泛影响包括对两名早期职业研究人员的支持、促进新的合作、对学生的支持、国际合作以及对 EPSCoR 州机构的支持