Coordination Funds

协调基金

• 批准号: 439826057
• 负责人: Professor Dr. Sumit Chakraborty, Ph.D.
• 金额: --
• 依托单位: Institut für Geologie, Mineralogie und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/439826057?language=en
• 关键词: Coordination; Funds

Geological processes occur in and on the Earth over a range of timescales that form a nested, hierarchical structure. Determining the durations of processes that occur on the shorter end of this time-spectrum has been a challenge. The tools of diffusion chronometry have emerged as a very promising method to provide solutions in many situations. High temperature magmatic systems provide an excellent natural laboratory for developing and calibrating these tools because various kinds of observations from monitoring volcanoes are able to provide cross checks on the results. Subsequently, the newly developed and refined tools may then be applied to a much wider range of geological and planetary settings. This project aims to bring together field geologists, experimental scientists, theoreticians and modellers from geosciences as well as neighbouring fields of physics and materials science to advance this development. Some of the main objectives of the first phase of the proposal for this research unit are: the measurement of missing diffusion parameters in pyroxenes and plagioclase, exploring the recently discovered role of isotopic fractionation at high temperatures due to diffusion, calibrating phase relations to enable the setting of boundary and initial conditions in high resolution diffusion models, exploring the role of textural evolution, and field tests in a divergent as well as at a convergent plate margin magmatic setting (Oman and Kamchatka, respectively).These will be accompanied by the development of user-friendly codes that incorporate the advances. The software would be distributed to the general community free of cost. Future plans include extension to more complex magmatic (e.g. explosive, caldera forming events) and melt-fluid- rock systems (migmatites, mantle metasomatism, ore formation). These would necessitate studies of diffusion in more complex minerals and polycrystalline systems (e.g. amphiboles, micas, water-bearing systems).

地质过程发生在地球内部和地球上的一系列时间尺度上，形成了嵌套的层次结构。确定在这一时间范围的较短一端发生的过程的持续时间一直是一个挑战。扩散计时法的工具已经成为一种非常有前途的方法，在许多情况下提供解决方案。高温岩浆系统为开发和校准这些工具提供了一个极好的天然实验室，因为监测火山的各种观测能够对结果进行交叉检查。随后，新开发和改进的工具可以应用于更广泛的地质和行星环境。该项目旨在汇集来自地球科学以及物理学和材料科学的邻近领域的实地地质学家，实验科学家，理论家和建模者，以推动这一发展。该研究单位第一阶段建议的一些主要目标是：在辉石和斜长石中缺失的扩散参数的测量，探索最近发现的由于扩散在高温下同位素分馏的作用，校准相位关系以使得能够在高分辨率扩散模型中设置边界和初始条件，探索结构演化的作用，在发散和会聚板块边缘岩浆环境（分别为阿曼和堪察加）进行实地测试，同时将编制用户友好的代码，将这些进展纳入其中。该软件将免费分发给一般社区。未来的计划包括扩展到更复杂的岩浆（如爆炸，火山口形成事件）和熔融流体岩石系统（混合岩，地幔交代，矿石形成）。这就需要研究更复杂的矿物和多晶系统（例如角闪石、云母、含水系统）中的扩散。