RUI Collaborative Research: Experimental Investigation of Fluid-Rock Interaction in Back-Arc Environments

RUI 合作研究：弧后环境中流体-岩石相互作用的实验研究

• 批准号: 0732410
• 负责人: Peter Saccocia
• 金额: $ 6.76万
• 依托单位: BRIDGEWATER STATE UNIVERSITY
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-10-01 至 2011-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0732410&HistoricalAwards=false
• 关键词: RUI; Collaborative; Research; Experimental; Investigation

Recent cruise results from the Lau back-arc basin documents hydrothermal fluid compositions that differ from vents along the global Mid-Ocean Ridge (MOR) system. Back-arc hydrothermal systems are likely controlled by a number of variables, including host substrate and magmatic fluids that contribute to vent fluid composition. It is these geologic factors that likely account for both the large differences between MOR and back-arc hydrothermal fluids and the regional variations in fluid composition observed within a single back-arc system. As a consequence of these complexities, models for the origin and evolution of hydrothermal fluids in back-arc environments are poorly constrained. This study is a laboratory investigation of the specific chemical processes that occur during the interaction of seawater-derived hydrothermal fluids with rocks of andesitic, dacitic, and rhyolitic compositions. These experiments are aimed at quantifying key processes that regulate fluid chemistry in back-arc hydrothermal systems. The Lau Basin has been designated as a RIDGE Integrated Study Site and the proposed research will enhance understanding of this focus area.This is a NSF-RUI investigation. It integrates research and education through a laboratory-based collaboration between the Woods Hole Oceanographic Institution (WHOI) and Bridgewater State College (BSC). The project will allow Dr. Peter Saccocia to conduct laboratory-based research relevant to the RIDGE initiative and thereby participate in cutting-edge research that would not otherwise be possible without a WHOI collaborator. Second, the research program will form the basis of an undergraduate research course in Earth Science at BSC. This course will enroll anywhere from 5-10 students and will be offered each spring semester over the three year grant period. Each student will 1) read relevant articles from the literature to learn about the background of the proposed research, 2) actively participate in the analytical work (at WHOI) associated with the experiments by working in teams, 3) interpret the results as the data is generated, 4) write reports describing the significant scientific results from their analytical team, and 5) contribute to the production of a single manuscript that emulates the format of a journal article. Thus, this RUI grant will provide an undergraduate research experience for up to 30 geology students at BSC, making them more competitive applicants to high quality graduate programs and enhancing the likelihood that they will pursue careers in the geosciences. In addition to the research course, this project provides an opportunity for up to 6 undergraduate students at BSC to perform more intensive research in the hydrothermal laboratory at WHOI during the summer months.

最近来自劳弧后盆地的巡航结果表明，热液流体组成与全球洋中脊（MOR）系统的喷口不同。弧后热液系统可能受到许多变量的控制，包括宿主基质和岩浆流体，它们对喷口流体组成有贡献。正是这些地质因素可能解释了MOR和弧后热液流体之间的巨大差异，以及在单个弧后系统中观察到的流体成分的区域差异。由于这些复杂性，对弧后环境中热液流体的起源和演化模型的约束很差。本研究是对由海水衍生的热液流体与安山岩、英安岩和流纹岩组成的岩石相互作用过程中发生的特定化学过程的实验室研究。这些实验旨在量化弧后热液系统中调节流体化学的关键过程。劳盆地已被指定为岭中脊综合研究地点，建议进行的研究将加深对这一重点地区的认识。这是NSF-RUI的一项调查。它通过伍兹霍尔海洋研究所（WHOI）和布里奇沃特州立学院（BSC）之间的实验室合作，将研究和教育结合起来。该项目将使Peter Saccocia博士能够开展与RIDGE倡议相关的实验室研究，从而参与没有WHOI合作者就不可能进行的前沿研究。其次，该研究项目将成为理学士学院地球科学本科研究课程的基础。本课程将招收5-10名学生，在三年的资助期内每年春季学期开设。每个学生将1)从文献中阅读相关文章，了解拟议研究的背景，2)通过团队合作积极参与与实验相关的分析工作（在WHOI）， 3)在数据生成时解释结果，4)撰写报告描述其分析团队的重要科学结果，5)参与制作一份模仿期刊文章格式的手稿。因此，这项RUI资助将为至多30名理学士学院地质学专业的学生提供本科研究经历，使他们在高质量的研究生课程中更具竞争力，并提高他们在地球科学领域从事职业的可能性。除了研究课程外，该项目还为BSC的6名本科生提供了一个机会，让他们在夏季期间在WHOI的热液实验室进行更深入的研究。