Unveiling the lithospheric cradle of the Antarctic ice sheet and dynamic topography effects

揭示南极冰盖的岩石圈摇篮和动态地形效应

• 批准号: 2592935
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2592935
• 关键词: Unveiling; lithospheric; cradle; Antarctic; ice

This project aims to transform our current knowledge of the Antarctic continent, by producing novel combined potential field, seismological and petrological models of crustal and lithospheric architecture in relation to large scale tectonic and geodynamic processes and models of the space-time evolution of dynamic topography linked to mantle dynamics. By analysing and modelling the lithosphere, we expect new linkages between Antarctica and the global supercontinent cycles to also emerge. The project will help constrain lithospheric influences on the evolution of paleotopography, and will help quantify key geological boundary conditions -such as geothermal heat flux- that can influence Antarctic ice sheet dynamics. And finally we anticipate new views into mantle effects on bedrock topography.The student will work on the analyses and modelling of data from recent international Antarctic-wide geophysical data compilations. These include updates to the AntGG gravity and ADMAP magnetic data compilations. Satellite gravity gradient and satellite magnetic anomaly datasets will also be used in new lithospheric-scale modelling efforts. The potential field data interpretation will rely on the development of new 2D and 3D models of crustal and lithospheric architecture and composition that will be integrated for the first time with the latest independent seismological constraints available and with petrological and thermal modelling efforts. The student will also utilise seismological and mantle flow models and analyse subglacial topography to aid the development of new reconstruction efforts of dynamic topography effects.

该项目旨在通过建立与大规模构造和地球动力学过程相关的地壳和岩石圈结构的新型组合势场、地震学和岩石学模型以及与地幔动力学相关的动态地形时空演化模型来改变我们目前对南极大陆的认识。通过对岩石圈进行分析和建模，我们预计南极洲与全球超大陆循环之间也会出现新的联系。该项目将有助于限制岩石圈对古地貌演化的影响，并将有助于量化可能影响南极冰盖动力学的关键地质边界条件，例如地热热通量。最后，我们预计对地幔对基岩地形影响的新观点。学生将对最近国际南极范围地球物理数据汇编的数据进行分析和建模。其中包括 AntGG 重力和 ADMAP 磁数据编译的更新。卫星重力梯度和卫星磁异常数据集也将用于新的岩石圈尺度建模工作。位场数据解释将依赖于地壳和岩石圈结构和成分的新 2D 和 3D 模型的开发，这些模型将首次与最新的独立地震学约束以及岩石学和热建模工作相结合。学生还将利用地震学和地幔流模型并分析冰下地形，以帮助开发动态地形效应的新重建工作。