Limits...
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

Correlation diagram between δ13C and CO2/3He ratios of high-temperature volcanic gases in circum-Pacific regions.Model end-members of the upper mantle, sediment and limestone are included. The curve shows mixing among the end-members. #Data are those of the following volcanoes: (#1) Klyuchevskoy, (#2) Koryak, (#3) Avacha, (#4) Mutnovsky, (#5) Kudryavy, (#6) Usu, (#7) Kuju, (#8) Unzen, (#9) Satsuma-Iwojima, (#10) Merapi, (#11) Lewotolo, (#12) Ngawha, (#13) White Island, (#14) Ngauruhoe, (#15) Cerro Negro, (#16) Momotombo, (#17) Pacaya, (#18) Galeras, (#19) Cumbal, (#20) Colima, (#21) La Primavera. All data are from Supplementary Table 3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4321164&req=5

f4: Correlation diagram between δ13C and CO2/3He ratios of high-temperature volcanic gases in circum-Pacific regions.Model end-members of the upper mantle, sediment and limestone are included. The curve shows mixing among the end-members. #Data are those of the following volcanoes: (#1) Klyuchevskoy, (#2) Koryak, (#3) Avacha, (#4) Mutnovsky, (#5) Kudryavy, (#6) Usu, (#7) Kuju, (#8) Unzen, (#9) Satsuma-Iwojima, (#10) Merapi, (#11) Lewotolo, (#12) Ngawha, (#13) White Island, (#14) Ngauruhoe, (#15) Cerro Negro, (#16) Momotombo, (#17) Pacaya, (#18) Galeras, (#19) Cumbal, (#20) Colima, (#21) La Primavera. All data are from Supplementary Table 3.

Mentions: For ARC volcanism, we selected 24 volcanic gas and steam well data with temperatures higher than 200°C (Supplementary Table 3). Their carbon source is well explained by the mixing of three components: The upper mantle (M), organic sediment (S) and limestone with a slab component (L) (Fig. 4; Ref. 30). These end-member components are described in Supplementary Table 3. Using those values, we calculate the respective percentages of the three components in the ARC samples (Supplementary Table 3). The contribution of the upper mantle carbon is 3.2%–36% (average 11%), whereas a major part is attributable to subducted carbonate and organic carbon. Because the average CO2/3He ratio of these data is (2.0 ± 0.3) × 1010, the carbon flux from ARC is (2.2 ± 0.5) × 1012 mol/y using the ARC 3He flux of 110 ± 20 mol/y, which is also consistent with the recent estimate using volcanic gas observations worldwide31.


Sulphur geodynamic cycle.

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

Correlation diagram between δ13C and CO2/3He ratios of high-temperature volcanic gases in circum-Pacific regions.Model end-members of the upper mantle, sediment and limestone are included. The curve shows mixing among the end-members. #Data are those of the following volcanoes: (#1) Klyuchevskoy, (#2) Koryak, (#3) Avacha, (#4) Mutnovsky, (#5) Kudryavy, (#6) Usu, (#7) Kuju, (#8) Unzen, (#9) Satsuma-Iwojima, (#10) Merapi, (#11) Lewotolo, (#12) Ngawha, (#13) White Island, (#14) Ngauruhoe, (#15) Cerro Negro, (#16) Momotombo, (#17) Pacaya, (#18) Galeras, (#19) Cumbal, (#20) Colima, (#21) La Primavera. All data are from Supplementary Table 3.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Correlation diagram between δ13C and CO2/3He ratios of high-temperature volcanic gases in circum-Pacific regions.Model end-members of the upper mantle, sediment and limestone are included. The curve shows mixing among the end-members. #Data are those of the following volcanoes: (#1) Klyuchevskoy, (#2) Koryak, (#3) Avacha, (#4) Mutnovsky, (#5) Kudryavy, (#6) Usu, (#7) Kuju, (#8) Unzen, (#9) Satsuma-Iwojima, (#10) Merapi, (#11) Lewotolo, (#12) Ngawha, (#13) White Island, (#14) Ngauruhoe, (#15) Cerro Negro, (#16) Momotombo, (#17) Pacaya, (#18) Galeras, (#19) Cumbal, (#20) Colima, (#21) La Primavera. All data are from Supplementary Table 3.
Mentions: For ARC volcanism, we selected 24 volcanic gas and steam well data with temperatures higher than 200°C (Supplementary Table 3). Their carbon source is well explained by the mixing of three components: The upper mantle (M), organic sediment (S) and limestone with a slab component (L) (Fig. 4; Ref. 30). These end-member components are described in Supplementary Table 3. Using those values, we calculate the respective percentages of the three components in the ARC samples (Supplementary Table 3). The contribution of the upper mantle carbon is 3.2%–36% (average 11%), whereas a major part is attributable to subducted carbonate and organic carbon. Because the average CO2/3He ratio of these data is (2.0 ± 0.3) × 1010, the carbon flux from ARC is (2.2 ± 0.5) × 1012 mol/y using the ARC 3He flux of 110 ± 20 mol/y, which is also consistent with the recent estimate using volcanic gas observations worldwide31.

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