Applications of the SW96 formulation in the thermodynamic calculation of fluid inclusions and mineral-fluid equilibria

Applications of the SW96 formulation in the thermodynamic calculation of fluid inclusions and mineral-fluid equilibria
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SW96公式在流体包裹体和矿物流体平衡热力学计算中的应用

DOI:
10.1016/j.gsf.2017.01.007
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发表时间:
2017-11
影响因子:
8.9
通讯作者:
Shide Mao
Shide Mao
中科院分区:
地球科学1区
文献类型:
--
作者:
Jia Zhang;Shide Mao

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Span和瓦格纳(1996)提出的以Helmholtz自由能表示的SW 96方程是目前最精确的多功能CO2流体状态方程,它可以在216.592 ~ 1100 K和0 ~ 8000 bar的温度-压力范围内得到符合或接近实验精度的所有热力学性质。本文报道了SW 96公式在流体包裹体和矿物-流体平衡研究中的应用。提出了一种可靠、高效的CO2饱和度计算方法,使该公式能方便地应用于流体包裹体研究,如计算流体包裹体的均匀化压力、均匀化密度(或摩尔体积)、气相体积分数和等容线等。同时,用SW 96公式和相应的矿物热力学模型计算了几种典型矿物的脱碳反应的单变曲线。SW 96公式的计算机程序可从相应作者处获得。
The SW96 formulation explicit in Helmholtz free energy proposed by Span and Wagner (1996) is the most accurate multifunction equation of state of CO2fluid, from which all thermodynamic properties can be obtained over a wide temperature-pressure range from 216.592 to 1100 K and from 0 to 8000 bar with or close to experimental accuracy. This paper reports the applications of the SW96 formulation in fluid inclusions and mineral-fluid equilibria. A reliable and highly efficient algorithm is presented for the saturated properties of CO2so that the formulation can be conveniently applied in the study of fluid inclusions, such as calculation of homogenization pressures, homogenization densities (or molar volumes), volume fractions of vapor phase and isochores. Meanwhile, the univariant curves of some typical decarbonation reactions of minerals are calculated with the SW96 formulation and relevant thermodynamic models of minerals. The computer code of the SW96 formulation can be obtained from the corresponding author.
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