Stable isotopes of strontium as a new proxy for continental weathering, pedogenesis processes and seawater temperature (TRION-project)

锶的稳定同位素作为大陆风化、成土过程和海水温度的新代理（TRION 项目）

• 批准号: 158416540
• 负责人: Professor Dr. Anton Eisenhauer
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/158416540?language=en
• 关键词: Stable; isotopes; strontium; new; proxy

General goals in the frame of the Trilateral ProgramThere is a general belief that scientific networking in a conflict region like the Middle East can support communication and understanding among the people and thus promote the efforts to achieve peace. The Trilateral Program of the German Science Foundation (DFG) aims to support such a process by involving Israeli, Palestinian and German scientists in joint scientific projects. In order to reach this ambitious goal in a sustainable way various aspects like joint student education and training, capacity building as well as public outreach efforts are needed to be addressed in the frame of the proposed TRION project.Scientific goals of the TRION II projectThe findings that there is natural and temperature dependent Sr isotope fractionation indicate that the origin of seawater Sr and its isotope composition is more complex than previously thought. In particular, we have to assume that weathered fractionated Sr from continental sources as well as fractionated Sr from hydrothermal sources together with the temperature dependent Sr isotope fractionation during carbonate precipitation/dissolution exerts control on the paired 87Sr/86Sr-d88/86Sr seawater ratios. Concerning the sources and sinks of Sr there is neither detailed information about the degree and mechanisms of Sr elemental discrimination and isotope fractionation in rocks and soils nor during marine organic and inorganic calcium carbonate (CaCO3) precipitation. However, the basic understanding of Sr elemental discrimination and isotope fractionation mechanisms are important in order to understand the Sr isotope balance in the ocean and may help to better elucidate the link between continental weathering and atmospheric pCO2 on geological time scales. Our goals within the TRION project were:Determine the mechanisms and degree of Sr isotope fractionation in continental rocks and soils being a major Sr source for the ocean.Determine the mechanisms and degree of temperature dependent Sr isotope fractionation during the precipitation of organic and inorganic marine carbonates being a major sink for Sr in the ocean

人们普遍认为，在像中东这样的冲突地区建立科学网络可以支持人民之间的沟通和理解，从而促进实现和平的努力。德国科学基金会（DFG）的三边项目旨在通过让以色列、巴勒斯坦和德国科学家参与联合科学项目来支持这一进程。为了以可持续的方式实现这一雄心勃勃的目标，需要在拟议的TRION项目框架内解决联合学生教育和培训、能力建设以及公众宣传工作等各个方面的问题。TRION II项目的科学目标：存在自然和温度依赖的Sr同位素分馏的发现表明，海水Sr的起源及其同位素组成比以前认为的要复杂得多。特别是，我们必须假设来自大陆源的风化分馏Sr和来自热液源的分馏Sr，以及碳酸盐沉淀/溶解过程中随温度变化的Sr同位素分馏控制了配对的87Sr/86Sr-d88/86Sr海水比值。关于锶的来源和汇，目前还没有关于岩石和土壤中锶元素辨别和同位素分异的程度和机制的详细资料，也没有关于海洋有机和无机碳酸钙（CaCO3）降水中锶元素辨别和同位素分异的详细资料。然而，了解海洋中锶元素的区分和同位素分馏机制对于理解海洋中锶同位素平衡具有重要意义，并有助于在地质时间尺度上更好地阐明大陆风化与大气pCO2之间的联系。我们在TRION项目中的目标是：确定作为海洋主要锶来源的大陆岩石和土壤中锶同位素分馏的机制和程度。确定作为海洋中锶的主要汇的有机和无机海洋碳酸盐降水过程中Sr同位素分馏的机制和温度依赖程度