Studies of Mantle Plumes and Sinking Lithosphere

地幔柱和下沉岩石圈的研究

• 批准号: 9218923
• 负责人: Richard O'Connell
• 金额: $ 9.9万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-01 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218923&HistoricalAwards=false
• 关键词: Studies; Mantle; Plumes; Sinking; Lithosphere

9218923 O'Connell The research is to study flow in the mantle where large viscosity variations are present. This includes the rise of plumes through the mantle, and the sinking of strong lithosphere as subducted slabs. The aim is to understand how the dynamics of the ascent of plumes is related to the rheological and thermal properties of the mantle, and how they interact with the core- mantle boundary, the transition zone and the Earth's surface. Another aim is to understand the deformation of sinking slabs, and to relate their seismicity and shape to the structure and dynamics of the mantle, and to determine how slabs interact with rheological and thermodynamic boundaries in the transition zone. The analysis of the problems will use the boundary integral method, which allows internal boundaries to be followed through large displacements and deformations, and makes the treatment of some three-dimensional subduction and plume problems feasible. The method will be extended to treat a phase boundary. ***

小行星9218923 这项研究是为了研究地幔中存在大粘度变化的流动。 这包括地幔柱的上升，以及强大的岩石圈作为俯冲板块的下沉。 目的是了解地幔柱上升的动力学如何与地幔的流变学和热特性相关，以及它们如何与核幔边界、过渡区和地球表面相互作用。 另一个目的是了解下沉板块的变形，并将其地震活动性和形状与地幔的结构和动力学联系起来，并确定板块如何与过渡区的流变学和热力学边界相互作用。 对这些问题的分析将使用边界积分法，这种方法允许通过大的位移和变形来跟踪内部边界，并使处理某些三维俯冲和羽流问题变得可行。 该方法将被扩展到处理相边界。 ***