CO2–H2O solubility in K-rich phonolitic and leucititic melts
CO2–H2O solubility in K-rich phonolitic and leucititic melts
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CO2-H2O 在富钾酚醛石和白榴石熔体中的溶解度
DOI：
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发表时间：
2019
影响因子：
3.5
通讯作者：
B. Schmidt
中科院分区：
文献类型：
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作者：
Max Schanofski;S. Fanara;B. Schmidt
在1250°C和50 ～ 300 MPa的压力下，实验研究了CO2和H2O在Vesuvius和Colli Albani的声母岩和白质熔体中的溶解度与CO2 - H2O流体组成的关系。通过热重法、碳硫分析和傅里叶变换红外（FTIR）光谱分析了淬火玻璃的挥发性含量，测定了5200 cm−1 （H2O分子）、4500 cm−1 （OH基团）和1510 cm−1和1430 cm−1碳酸盐重态的H2O和co2相关红外波段的吸收系数。在我们的声母玻璃和白岩玻璃中没有检测到分子CO2。通过微atr（衰减全反射）红外光谱定量分析了CO2浓度升高（透射FTIR测量接近全吸收）的白质玻璃。虽然两种熔体中的水溶解度对于纯H2O和混合CO2 - H2O流体（给定$$ f_{{{\text{H}}_{ 2} {\text{O}}}} $$ fH2O）非常相似，但CO2溶解度在很大程度上取决于熔体成分。在100 ～ 300 MPa范围内，纯CO2在phonolite熔体中的溶解度从580 ～ 1800 ppm增加，在leucite熔体中的溶解度从2950 ～ 8460 ppm增加。对于白长石熔体，我们观察到CO2溶解度随$$ f_{{{\text{CO}}_{ 2} }} $$ fCO2函数的单一幂律趋势，无论熔体是用纯CO2还是混合CO2 - h2o流体平衡，表明水作为流体相的稀释剂。然而，对于phonolite熔体，我们观察到混合CO2 - h2o样品的溶解度正偏离纯CO2溶解度数据定义的幂律趋势。这种效应似乎随着含水量和压力的增加而增加。我们的解释是，这种增强的CO2溶解度是由水引起的熔体解聚引起的，与相对解聚的白晶石熔体相比，在相对聚合的声质体熔体中更为明显。
The solubility of CO2 and H2O in phonolitic and leucititic melts from Vesuvius and Colli Albani was investigated experimentally at 1250 °C and pressures between 50 and 300 MPa as a function of CO2–H2O fluid composition. Quenched glasses were analyzed for their volatile contents by thermogravimetry, carbon–sulfur analysis, and Fourier transform infrared (FTIR) spectroscopy, which enabled the determination of the absorption coefficients of the H2O- and CO2-related IR bands at 5200 cm−1 (H2O molecules), 4500 cm−1 (OH groups), and the carbonate doublet at 1510 and 1430 cm−1. No molecular CO2 was detected in our phonolitic and leucititic glasses. Leucititic glasses with elevated CO2 concentrations (approaching total absorption in transmission FTIR measurements) were also analyzed quantitatively by micro-ATR (attenuated total reflection) IR spectroscopy. While the water solubility in both melts is quite similar for pure H2O as well as for mixed CO2–H2O fluids (at given $$ f_{{{\text{H}}_{ 2} {\text{O}}}} $$fH2O), the CO2 solubility depends strongly on melt composition. In the range of 100–300 MPa, the solubility of pure CO2 increases from 580 to 1800 ppm in the phonolite melt and from 2950 to 8460 ppm in the leucitite melt. For the leucitite melt, we observe a single power law trend of CO2 solubility as function of $$ f_{{{\text{CO}}_{ 2} }} $$fCO2, regardless if the melt was equilibrated with pure CO2 or mixed CO2–H2O fluids, indicating that water acts as diluent of the fluid phase. However, for the phonolite melt, we observe for mixed CO2–H2O samples a positive solubility deviation from the power law trend defined by the data for pure CO2 solubility. This effect seems to increase with increasing water content and pressure. Our interpretation is that this enhanced CO2 solubility is caused by melt depolymerization induced by water and is more apparent in the relatively polymerized phonolitic melt compared to the relatively depolymerized leucititic melt.
与坎帕尼亚熔岩喷发相关的岩浆中的挥发物：实验与自然发现
影响因子：
3.1
作者：
Fanara;Botcharnikov;Palladino;Buddensieck;Behrens
通讯作者：
Behrens
成分和压力对镁铁质熔体中 H2O 和 CO2 溶解度的影响
影响因子：
3.9
作者：
Shishkina T.A;Botcharnikov R.E;Holtz F;Almeev R;Jazwa A;Jakubiak A.
通讯作者：
Jakubiak A.