Resolving seawater stable (88Sr/86Sr) strontium isotope variations and their implications for the global strontium cycle

海洋沉积物记录中的锶(锶)同位素有可能揭示海洋-气候系统过去的变化。虽然已经建立了放射性成因锶同位素的记录，但测量稳定的锶同位素所需的分析能力是最近才发展起来的。这项拟议的工作将利用这些分析进展来测量海洋重晶石中记录的稳定的锶同位素。海洋重晶石与海水中稳定锶的关系将被标定，并用于重建过去1.3亿年来全球海洋中的稳定锶。这些数据将与现有的放射性成因锶记录结合起来，以更好地了解全球海水化学和生物地球化学循环的变化，并确定它们与构造和气候扰动的关系。这项工作将有助于建立一种相对较新的工具在研究过去海洋和气候条件方面的效用。将为一名研究生和几名本科生提供培训和指导，他们将有机会在科学会议上展示他们的研究成果。国际和平协会将制定新的课程，并继续进行外展工作。该项目将促进UCSC、肯特州立大学、美国地质调查局和GEOMAR(德国)的研究人员之间的合作。

Strontium (Sr) isotopes in the marine sediment record have the potential to shed light on past changes in the ocean-climate system. Although records of radiogenic Sr isotopes have been established, the analytical capabilities needed to measure stable Sr isotopes were developed only recently. The proposed work will take advantage of these analytical advances to measure stable Sr isotopes recorded in marine barite. The relationship between marine barite and stable Sr in seawater will be calibrated and used to reconstruct stable Sr in the global ocean for the past 130 million years. These data will be combined with an existing radiogenic Sr record to better understand global changes in seawater chemistry and biogeochemical cycles, and to determine their relationship to perturbations in tectonics and climate.This work will help establish the utility of a relatively new tool in the study of past ocean and climate conditions. Training and mentoring will be provided for a graduate student and several undergraduate students, who will have the opportunity to present their research at scientific conferences. The PI will develop new curricula and continue ongoing outreach efforts. The project will facilitate collaboration between researchers at UCSC, Kent State University, the U.S. Geological Survey, and GEOMAR (Germany).