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Sulphur geodynamic cycle.

Kagoshima T, Sano Y, Takahata N, Maruoka T, Fischer TP, Hattori K - Sci Rep (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Chiba 277-8564, Japan.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

Schematic diagrams of (a) the global sulphur cycle and (b) the global carbon cycle.Each flux is given in units of 109 mol/y. It should be noted that steady-state surface environments of these elements were applied.
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f3: Schematic diagrams of (a) the global sulphur cycle and (b) the global carbon cycle.Each flux is given in units of 109 mol/y. It should be noted that steady-state surface environments of these elements were applied.

Mentions: A summary of the global sulphur flux is depicted in Fig. 3a. Present hot spot magmatism likely does not contribute substantially to the global flux of sulphur (See Supplementary Discussion). The total volcanic flux of sulphur is estimated as 8.2 × 1011 mol/y and represents about one-third of the anthropogenic emissions due to coal burning and sulphide ore smelting27. This natural flux, if it has remained constant over 4.55 billion years of geological time, engenders an accumulation of 3.7 × 1021 mol. This value is greater than the surface inventory of 5.3 × 1020 mol1. If we take the MOR flux together only with the mantle wedge flux of 2.1 × 1010 mol/y, then the accumulation becomes 5.6 × 1020 mol in total, which is equivalent to the surface inventory. When steady-state recycling of sulphur is applied, the total subducting flux becomes 8.2 × 1011 mol/y.


Sulphur geodynamic cycle.

Kagoshima T, Sano Y, Takahata N, Maruoka T, Fischer TP, Hattori K - Sci Rep (2015)

Schematic diagrams of (a) the global sulphur cycle and (b) the global carbon cycle.Each flux is given in units of 109 mol/y. It should be noted that steady-state surface environments of these elements were applied.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4321164&req=5

f3: Schematic diagrams of (a) the global sulphur cycle and (b) the global carbon cycle.Each flux is given in units of 109 mol/y. It should be noted that steady-state surface environments of these elements were applied.
Mentions: A summary of the global sulphur flux is depicted in Fig. 3a. Present hot spot magmatism likely does not contribute substantially to the global flux of sulphur (See Supplementary Discussion). The total volcanic flux of sulphur is estimated as 8.2 × 1011 mol/y and represents about one-third of the anthropogenic emissions due to coal burning and sulphide ore smelting27. This natural flux, if it has remained constant over 4.55 billion years of geological time, engenders an accumulation of 3.7 × 1021 mol. This value is greater than the surface inventory of 5.3 × 1020 mol1. If we take the MOR flux together only with the mantle wedge flux of 2.1 × 1010 mol/y, then the accumulation becomes 5.6 × 1020 mol in total, which is equivalent to the surface inventory. When steady-state recycling of sulphur is applied, the total subducting flux becomes 8.2 × 1011 mol/y.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Chiba 277-8564, Japan.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus