Gas chemistry and nitrogen isotope compositions of cold mantle gases from Rungwe Volcanic Province, southern Tanzania
Gas chemistry and nitrogen isotope compositions of cold mantle gases from Rungwe Volcanic Province, southern Tanzania
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DOI：
10.1016/j.chemgeo.2012.08.004
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发表时间：
2013-02-15
期刊：
影响因子：
3.9
通讯作者：
Ramirez, C.
中科院分区：
文献类型：
--
作者：
de Moor, J. M.;Fischer, T. P.;Ramirez, C.
我们报告的第一个完整的散装气体化学和氮同位素数据的地热挥发物从Rungwe火山省，位于马拉维湖以北的东非大裂谷的西部分支。Rungwe的泉水温度和气体排放量从13摄氏度到65摄氏度不等，北方和南部低地的泉水温度最高。强烈脱气的冷CO2喷口和温泉的温度在13摄氏度到36摄氏度之间，并且位于比温泉更高的海拔。气体组成类似于99%CO2，0.0008至0.0078 mmol/mol H-2，0.0004至0.062 mmol/mol He，0.08至0.77 mmol/mol Ar，3.1至28.5 mmol/mol N-2，0.4至3.73 mmol/mol O-2，
We report the first complete bulk gas chemistry and nitrogen isotope data for geothermal volatiles from the Rungwe Volcanic Province, located in the western branch of the East African Rift north of Lake Malawi. Temperatures of springs and gas emissions at Rungwe vary from 13 degrees C to 65 degrees C with the highest temperatures observed at the springs in the northern and southern lowlands. The vigorously degassing cold CO2 vents and springs have temperatures between 13 degrees C and 36 degrees C and are located at higher elevation than the hot springs. The gas compositions are similar to 99% CO2, 0.0008 to 0.0078 mmol/mol H-2, 0.0004 to 0.062 mmol/mol He, 0.08 to 0.77 mmol/mol Ar, 3.1 to 28.5 mmol/mol N-2, 0.4 to 3.73 mmol/mol O-2,