| 项目编号: | NE/L007363/1
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| 项目名称: | The Strength of the Lower Mantle |
| 作者: | Elisabetta Mariani
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| 承担单位: | University of Liverpool
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| 批准年: | 2013
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| 开始日期: | 2014-30-06
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| 结束日期: | 2017-31-12
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| 资助金额: | GBP345921
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| 资助来源: | UK-NERC
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| 项目类别: | Research Grant
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| 国家: | UK
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| 语种: | 英语
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| 特色学科分类: | Geosciences 
; (100%)
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| 英文摘要: | The internal behaviour of the Earth is controlled by convection hence knowledge of mantle viscosity is critical to our understanding. The viscosity of the mantle on large scales has been measured from post-glacial rebound and geoid inversions. These have shown that there is a significant contrast in viscosity between the upper and lower mantles which has been invoked to explain the varied behaviour of subducting slabs at the 660 km discontinuity. The slabs show a range of behaviour from ponding just above the 660 km discontinuity to penetrating the discontinuity and thickening as they enter the lower mantle.
It is apparent therefore that the size and impermeability of the 660 km viscosity contrast affects the style of mantle convection and cooling rates but the resolution of the geophysical observations is not sufficient for a complete understanding of the fate of material around the 660 km discontinuity. Here we propose to measure the rheology of the minerals and assemblages present in the transition-zone and lower-mantle and so provide the constraints needed for a fuller understanding of the viscosity contrast between the upper and lower mantles. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/101711
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | University of Liverpool
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| Recommended Citation: | |
Elisabetta Mariani. The Strength of the Lower Mantle. 2013-01-01.
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