Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Chiba 277-8564, Japan.
Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
Sci Rep. 2015 Feb 9;5:8330. doi: 10.1038/srep08330.
Evaluation of volcanic and hydrothermal fluxes to the surface environments is important to elucidate the geochemical cycle of sulphur and the evolution of ocean chemistry. This paper presents S/(3)He ratios of vesicles in mid-ocean ridge (MOR) basalt glass together with the ratios of high-temperature hydrothermal fluids to calculate the sulphur flux of 100 Gmol/y at MOR. The S/(3)He ratios of high-temperature volcanic gases show sulphur flux of 720 Gmol/y at arc volcanoes (ARC) with a contribution from the mantle of 2.9%, which is calculated as 21 Gmol/y. The C/S flux ratio of 12 from the mantle at MOR and ARC is comparable to the C/S ratio in the surface inventory, which suggests that these elements in the surface environments originated from the upper mantle.
评估火山和热液对地表环境的通量对于阐明硫的地球化学循环和海洋化学演化非常重要。本文通过测定洋中脊（MOR）玄武玻璃中气泡的 S/(3)He 比值，以及高温热液流体的比值，计算出 MOR 的硫通量为 100Gmol/y。弧火山（ARC）高温火山气体的 S/(3)He 比值表明，来自地幔的硫通量为 720Gmol/y，其中地幔的贡献为 2.9%，即 21Gmol/y。MOR 和 ARC 地幔的 C/S 通量比为 12，与地表库存中的 C/S 比值相当，这表明地表环境中的这些元素来自上地幔。
