Collaborative Research: Stable strontium isotope ratios (88/86Sr) in abiotic and microbially mediated barite

合作研究：非生物和微生物介导的重晶石中的稳定锶同位素比率 (88/86Sr)

• 批准号: 1053312
• 负责人: Elizabeth Griffith
• 金额: $ 14.22万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1053312&HistoricalAwards=false
• 关键词: Collaborative; Research; Stable; strontium; isotope

Results from the proposed research will generate novel isotope measurements from barite, a highly stable and widely-distributed mineral found in magmatic, metamorphic, and sedimentary rocks of all ages, as well as in soils, aerosol dust, and extraterrestrial material. Establishing the controlling parameters of stable Sr-isotopic fractionation in barite will open a new avenue for geological and environmental research including geochemical, hydrogeological, hydrothermal, and paleoenvironmental studies. This fundamental research will lay the groundwork for future studies in the earth sciences using measurements of mass dependent Sr isotopes in barite. Barite may be an ideal vehicle to address critical questions in the earth sciences, including early earth biogeochemistry, evidence of potential life in extraterrestrial samples, reconstruction of temperatures in formation fluids such as springs and seeps, water rock interactions, tracking provenances of atmospheric inputs into soils, and reconstructing global changes in Sr2+ budgets during earth?s past.Very few laboratories in the world have developed methods to measure stable Sr-isotope ratios; and work on this new stable isotopic system proposed here will provide a unique opportunity to contribute to the development of this new isotope system in its beginning stages. Graduate and undergraduate students will have the opportunity to work and interact in multiple laboratories on this research project (at Kent State Univ., USC, Univ. of Akron, UCLA, Univ. of Oklahoma) thus developing and mentoring research and analytical skills. They will conduct careful experiments, collect samples in the field at an established field site in western Oklahoma and interact with students involved in this project as well as field sites in western Colorado and northern Utah. Outreach activities in local high schools will be established through a published hands-on learning module which investigates fundamental concepts of the ?greenhouse effect? and will employ our current geology students to visit their old high schools and relay their excitement for the geosciences as a future career.

拟议研究的结果将产生重晶石的新同位素测量，重晶石是一种高度稳定且分布广泛的矿物，存在于各个时代的岩浆岩、变质岩和沉积岩以及土壤、气溶胶尘埃和外星物质中。建立重晶石中稳定锶同位素分馏的控制参数将为地球化学、水文地质、热液和古环境研究等地质和环境研究开辟新途径。这项基础研究将为未来通过测量重晶石中质量相关的锶同位素进行地球科学研究奠定基础。重晶石可能是解决地球科学中关键问题的理想工具，包括早期地球生物地球化学、外星样本中潜在生命的证据、重建地层流体（如泉水和渗漏）的温度、水岩相互作用、跟踪大气输入的来源土壤，并重建地球过去 Sr2+ 预算的全球变化。世界上很少有实验室开发出测量稳定 Sr 同位素比率的方法；这里提出的这种新的稳定同位素系统的工作将为该新同位素系统的初始阶段的开发提供独特的机会。研究生和本科生将有机会在该研究项目的多个实验室（肯特州立大学、南加州大学、阿克伦大学、加州大学洛杉矶分校、俄克拉荷马大学）工作和互动，从而发展和指导研究和分析技能。他们将进行仔细的实验​​，在俄克拉荷马州西部的一个已建立的现场现场收集样本，并与参与该项目的学生以及科罗拉多州西部和犹他州北部的现场现场进行互动。当地高中的外展活动将通过已发布的实践学习模块来开展，该模块研究“温室效应”的基本概念。并将聘请我们现在的地质学学生参观他们以前的高中，并传达他们对地球科学作为未来职业的兴奋。