| 项目编号: | 1426526
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| 项目名称: | Shock Wave Studies of Liquids in Earth's Core and Mantle |
| 作者: | Paul Asimow
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| 承担单位: | California Institute of Technology
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| 批准年: | 2013
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| 开始日期: | 2014-08-01
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| 结束日期: | 2018-01-31
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| 资助金额: | USD1050000
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | shock-and-ramp
; temperature
; sound speed
; development
; shock compression
; caltech shock wave laboratory
; shocked magma
; liquid iron alloy
; shocked liquid
; outer core
; actual outer core temperature profile
; early molten earth
; outer core composition
; metallic liquid
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| 英文摘要: | This award will support a three-year effort in the Caltech shock wave laboratory to measure properties of rocky and metallic liquids under conditions matching those in the deepest parts of the Earth. This information is critical to interpreting geophysical observations of the lower mantle and core in terms of composition, temperature, heat flow, and evolution over time. It also allows speculative ideas about an early molten earth to be developed into detailed theories. Shock compression is the only experimental method that can simultaneously measure density, pressure, temperature, energy, and sound speed of liquids at such extreme conditions.
The experimental and science agenda in this proposal is driven by key technical advances. Development of an encapsulation technique allowing us to pre-heat silicate glasses well above their melting point without formation of bubbles and in sealed behind a transparent window allows us to observe thermal radiation from the shocked liquid. Measurement of temperatures and sound speeds in shocked magmas will complete our ability to describe their properties at any desired pressure and temperature. Likewise, the development of graded density impactors for customized shock-and-ramp loading paths, together with our pre-heating capability and development of advanced window materials enabled measurement of the sound speeds and densities of liquid iron alloys along actual outer core temperature profiles. This novel experimental measurement will make the well-defined observed gradient in sound speed with depth in the outer core a new and critical constraint on outer core composition. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/96291
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Paul Asimow. Shock Wave Studies of Liquids in Earth's Core and Mantle. 2013-01-01.
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