Halogen degassing during ascent and eruption of water-poor basaltic magma
Halogen degassing during ascent and eruption of water-poor basaltic magma
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DOI：
10.1016/j.chemgeo.2008.09.022
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发表时间：
2009-06-15
期刊：
影响因子：
3.9
通讯作者：
Herd, Richard A.
中科院分区：
文献类型：
--
作者：
Edmonds, Marie;Gerlach, Terrence M.;Herd, Richard A.
通过对火山气体组成和基质玻璃挥发浓度的研究，可以建立夏威夷基拉韦厄火山的卤素脱气模型。2004年至2005年期间排放的火山气体的特征是，摩尔SO2/HCl为10-，平均值为33；摩尔HF/HCl为0-5，平均值为1.0(来自大约2500个测量值)。HF/HCl比SO2/HCl变化更大，且两者相关性较弱。比例的变化发生在快速的时间尺度(秒)上。2006年爆发的贝利眼泪基质玻璃的平均S、氯和氟含量分别为67ppm、85ppm和173ppm，但与S/F的大范围有关。利用本研究的玻璃数据、以前发表的结果和以前工作中的硫脱气参数，建立了一个描述从母岩浆中释放卤素的开放系统模型。结果表明，卤素脱气发生在压力为
A study of volcanic gas composition and matrix glass volatile concentrations has allowed a model for halogen degassing to be formulated for Kilauea Volcano, Hawai i. Volcanic gases emitted during 2004-2005 were characterised by a molar SO2/HCl of 10-64, with a mean of 33; and a molar HF/HCl of 0-5, with a mean of 1.0 (from approximately 2500 measurements). The HF/HCl ratio was more variable than the SO2/HCl ratio, and the two correlate weakly. Variations in ratio took place over rapid timescales (seconds). Matrix glasses of Pele's tears erupted in 2006 have a mean S, Cl and F content of 67, 85 and 173 ppm respectively, but are associated with a large range in S/F. A model is developed that describes the open system degassing of halogens from parental magmas, using the glass data from this study, previously published results and parameterisation of sulphur degassing from previous work. The results illustrate that halogen degassing takes place at pressures of