Estimating global subduction mass transport

估计全球俯冲质量传输

• 批准号: 1720839
• 负责人: Thorsten Becker
• 金额: $ 8.6万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-11-23 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1720839&HistoricalAwards=false
• 关键词: Estimating; global; subduction; mass; transport

This project focuses on slab mass transport into the lower mantle. It will, 1), expand the range of constraints on the degree of slab stagnation, e.g. by detailed analysis of transition zone thickness as well as hypothesis-driven reinversion of seismological data; 2), construct, by means of further software development, regional dynamic models and simplified global parameterizations for stagnation systematics in a thermo-chemical, multi-phase transition mantle system; and, 3), benchmark these computational convection models for vertical and horizontal transport. A graduate student from an under-represented group will be trained in interdisciplinary research. All project software will be developed openly and shared freely online. The tomographic inversion and modeling tools will be implemented into the Solid Earth Teaching and Research Environment software framework, allowing data-driven hypothesis testing for entirely different geodynamic questions and facilitating the training of Earth science students in interdisciplinary research.Better estimates of the slab flux, over time and with error bars, will help to constrain geochemical mixing and thermal Earth evolution models. The study will contribute to the use of slabs for absolute plate-tectonic reference frames, and slab dynamics has other, broad implications such as on net rotations of the lithosphere with respect to the lower mantle, interactions with the super-continental cycle, and sealevel variations.

该项目的重点是板片质量运输到下地幔。它将，1）扩大板坯停滞程度的约束范围，例如通过对过渡带厚度的详细分析以及地震数据的假设驱动的再反演； 2）通过进一步的软件开发，构建热化学、多相变地幔系统中停滞系统的区域动力学模型和简化的全局参数化； 3) 对这些垂直和水平传输的计算对流模型进行基准测试。来自代表性不足群体的研究生将接受跨学科研究的培训。所有项目软件将公开开发并在线免费共享。层析成像反演和建模工具将被应用到固体地球教学和研究环境软件框架中，允许对完全不同的地球动力学问题进行数据驱动的假设检验，并促进地球科学学生跨学科研究的培训。更好地估计板片通量，随着时间的推移和误差线，将有助于约束地球化学混合和地球热演化模型。这项研究将有助于使用板片作为绝对板块构造参考框架，并且板片动力学具有其他广泛的影响，例如岩石圈相对于下地幔的净旋转、与超大陆旋回的相互作用以及海平面变化。