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

三边方案框架内的总体目标人们普遍认为，在中东这样的冲突地区建立科学网络可以促进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)的三方计划旨在通过让以色列、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项目框架内处理多个方面，如联合学生教育和培训、能力建设以及公共宣传努力。Trion II项目的科学目标存在自然和温度相关的锶同位素分馏的发现表明，海水锶的来源及其同位素组成比之前认为的更复杂。特别是，我们必须假设陆源风化的分馏和热液来源的分馏以及碳酸盐沉淀/溶解过程中随温度变化的锶同位素分馏共同控制着成对的87Sr/86Sr-D88/86Sr海水比值。关于锶的来源和汇，既没有关于岩石和土壤中锶元素分异和同位素分馏的程度和机制的详细信息，也没有关于海洋有机和无机碳酸钙(CaCO3)沉淀的详细信息。然而，为了更好地了解海洋中的锶同位素平衡，并有助于在地质时间尺度上更好地阐明大陆风化与大气二氧化碳之间的联系，对锶元素分异和同位素分馏机制的基本了解是重要的。我们在Trion项目中的目标是：确定作为海洋主要锶来源的陆相岩石和土壤中锶同位素分馏的机制和程度。确定有机和无机海相碳酸盐沉淀过程中锶同位素分馏的机制和程度是海洋中锶的主要汇

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