CO 2 , 13 C/ 12 C and H 2 O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques
CO 2 , 13 C/ 12 C and H 2 O variability in natural basaltic glasses: a study comparing stepped heating and ftir spectroscopic techniques
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DOI：
10.1016/s0016-7037(99)00124-6
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发表时间：
1999-06
影响因子：
5
通讯作者：
C. Macpherson;D. Hilton;S. Newman;D. Mattey
中科院分区：
文献类型：
--
作者：
C. Macpherson;D. Hilton;S. Newman;D. Mattey
两个独立的技术的比较被用来评估的CO2和H2O的浓度在一些天然玄武岩玻璃的均匀性。通过比较两个不同实验室获得的分步加热数据，确定了碳浓度和同位素比值的变化。溶解挥发物浓度也得到了逐步加热和傅里叶变换红外光谱（FTIR）。对大洋中脊玄武岩玻璃的重复阶跃加热分析表明，大量岩浆和溶解CO2的浓度和13 C/12 C的变化分别小于±10%和±0.5‰。相似程度的相关性观察到重复的马里亚纳海槽玻璃在两个不同的实验室进行的逐步加热分析。溶解CO2浓度测定的逐步加热也相关以及与FTIR光谱测量的浓度。在这些实验中获得的结果的对应性提供了一个上限的浓度和这些挥发性物质在玄武质玻璃的同位素比的自然变化的程度，并建议，内在的，岩浆碳在这些玻璃中有一个相对均匀的分布。通过加热提取和FTIR测定的水浓度也显示出极好的一致性。
A comparison of two independent techniques was used to assess the homogeneity of CO2and H2O concentrations in a number of natural basaltic glasses. Variations in carbon concentration and isotopic ratio were determined by comparison of stepped heating data obtained in two different laboratories. Dissolved volatile concentrations were also obtained by stepped heating and Fourier Transform Infrared (FTIR) spectroscopy. Replicate stepped heating analyses of a mid-ocean ridge basaltic glass show that the concentration and13C/12C of bulk magmatic and dissolved CO2vary by less than ±10% and ±0.5‰, respectively. A similar degree of correlation is observed for replicate stepped heating analyses of Mariana Trough glasses conducted in two different laboratories. Dissolved CO2concentrations determined by stepped heating also correlate well with concentrations measured by FTIR spectroscopy. The correspondence of results obtained in these experiments provide an upper limit to the degree of natural variation in concentrations and isotopic ratios of these volatiles in basaltic glasses and suggest that intrinsic, magmatic carbon has a relatively homogeneous distribution in these glasses. Water concentrations determined through extraction by heating and FTIR also show excellent agreement.