| DOI: | 10.2172/1182331
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| 报告号: | Not applicable
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| 报告题名: | Aqueous Geochemistry at High Pressures and High Temperatures |
| 作者: | Bass, Jay D.
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| 出版年: | 2015
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| 发表日期: | 2015-05-21
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| 总页数: | 13
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Equations of state, sound velocities, elastic properties, water, aqueous fluids, carbon dioxide, Brillouin scattering, X-ray diffraction
|
| 中文主题词: | 碳
; 散射
; 边界
; 二氧化碳
; 地球化学
; 矿物
; X射线
|
| 主题词: | CARBON
; SCATTERING
; BOUNDARIES
; CARBON DIOXIDE
; GEOCHEMISTRY
; MINERALS
; X-RAY
|
| 英文摘要: | This project is aimed at experimental characterization of the sound velocities, equations of state (EOS), and derived physical and chemical properties of aqueous solutions and carbon dioxide at extreme pressure and temperature conditions relevant to processes occurring in the interior of the Earth. Chemical transport, phase changes (including melting), fluid-solid reactions, and formation of magmatic liquids at convergent plat boundaries are a key motivation for this project. Research in this area has long been limited by the extreme experimental challenges and lack of data under the appropriate pressure-temperature (P-T) conditions. The vast majority of studies of aqueous geochemistry relevant to terrestrial problems of fluid-rock interactions have been conducted at 0.3 GPa or less, and the widely used Helgeson-Kirkham-Flowers equation of state for aqueous species is applicable only at ~ < 0.5 GPa. These limits are unfortunate because fluid flow and reactions plays a central role in many deeper environments. Recent efforts including our own, have resulted in new experimental techniques that now make it possible to investigate properties of homogeneous and heterogeneous equilibria involving aqueous species and minerals over a much broader range of pressure and temperature appropriate for deep crustal and upper mantle processes involving water-rich fluids. We carried out 1) Brillouin scattering measurements of the equations of state and molar volume of water and carbon dioxide to over 10 GPa and 870K using precise resistance heating of samples under pressure in the diamond anvil cell, and 2) the phase diagrams of the water and CO2, and 3) Exploring new experimental approaches, including CO2 laser heating of samples in a diamond cell, to measurements of sound velocities, EOS, and phase relations by Brillouin scattering to far greater pressures and temperatures. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1182331
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/41867
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1182331.pdf（1344KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Bass, Jay D.. Aqueous Geochemistry at High Pressures and High Temperatures. 2015-01-01.
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