EAR-PF: Dynamics and melting of the upper mantle: Relating the length scales of compositional heterogeneity in the crust and mantle

EAR-PF：上地幔的动力学和熔化：与地壳和地幔成分异质性的长度尺度相关

• 批准号: 0948345
• 负责人: Todd Bianco
• 金额: $ 17万
• 依托单位: Bianco Todd A
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0948345&HistoricalAwards=false
• 关键词: EAR; PF; Dynamics; melting; upper

Dr. Todd A. Bianco has been granted an NSF Earth Sciences Postdoctoral Fellowship to carry out a research and education plan at Brown University. Using computer simulations of mantle dynamics, rock melting and melt transport, this project will test how different size distributions in mantle heterogeneity affect crust composition. Further, the project will address how realistic processes of melt migration amplify or dampen the signature of mantle composition and mantle dynamics in crust composition. The computer simulations will solve conservation of mass, momentum, and energy in a three dimensional space with properties that capture the rheologic, temperature, and density variations in the upper mantle. In addition, the simulation will include discrete domains of compositional heterogeneity of varying sizes. Predictions from computational simulations will be compared to observations of crust composition at a variety of tectonic settings such as a mid-ocean ridge, and anomalously thick seafloor. Mantle convection controls much of the evolution of earth, and therefore is an essential piece to understanding observations of the current state of the earth. The size and distribution of compositional heterogeneity in the mantle gives a picture of the state of mantle convection over time. Therefore, by quantifying the relationship between observed compositional variation in the crust with inferred variation in the mantle, this project will, in a broader sense, improve our understanding of how the earth has evolved. In addition the PI will provide undergraduate research opportunities at Brown University, the host institution for the project, as well as research experience to local teachers through Brown University's NSF-funded GK-12 program.

Todd A. Bianco博士已获得NSF地球科学博士后奖学金，以在布朗大学执行研究和教育计划。使用地幔动力学，岩石熔化和熔体传输的计算机模拟，该项目将测试地幔异质性不同大小分布如何影响地壳组成。此外，该项目将解决熔体迁移的现实过程的放大或抑制地幔组成中地幔组成和地幔动力学的特征。 计算机模拟将在三维空间中解决质量，动量和能量的保护，并具有捕获上地幔中流变学，温度和密度变化的性能。此外，模拟将包括不同大小的组成异质性的离散域。将计算模拟的预测与在各种构造环境（例如中山脊）和异常厚的海底观察结果进行比较。 地幔对流控制着地球的大部分进化，因此是理解地球当前状态的观察结果的重要部分。地幔中组成异质性的大小和分布给出了随着时间的推移对流状态的图片。因此，通过量化地壳中观察到的组成变化之间的关系之间的关系，从广义上讲，该项目将改善我们对地球如何发展的理解。此外，PI将通过Brown University的NSF资助的GK-12计划为布朗大学（Brown University），Brown University，Brown University，Brown University，Brown University，该项目的主持机构以及研究经验。