Aqueous Geochemistry at High Pressures and High Temperatures

doi:10.2172/1182331

GSTDTAP > 地球科学

DOI	10.2172/1182331
报告编号	Not applicable
来源ID	OSTI ID: 1182331
	Aqueous Geochemistry at High Pressures and High Temperatures
	Bass, Jay D.
	2015-05-21
出版年	2015
页数	13
语种	英语
国家	美国
领域	地球科学
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.
英文关键词	Equations of state, sound velocities, elastic properties, water, aqueous fluids, carbon dioxide, Brillouin scattering, X-ray diffraction
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/6802
专题	地球科学
推荐引用方式 GB/T 7714	Bass, Jay D.. Aqueous Geochemistry at High Pressures and High Temperatures,2015.