Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge

ZENG Zhi-gang; ZHAI Shi-kui; DU An-dao

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Article Navigation > Acta Sedimentologica Sinica > 2002 > 20(3): 394-398

ZENG Zhi-gang, ZHAI Shi-kui, DU An-dao. Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge[J]. Acta Sedimentologica Sinica, 2002, 20(3): 394-398.

Citation:

ZENG Zhi-gang, ZHAI Shi-kui, DU An-dao. Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge[J]. Acta Sedimentologica Sinica, 2002, 20(3): 394-398.

Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge

1 Institute of Oceanology,Chinese Academy of Sciences,Qingdao Shandong 266071;
2 College of Marine Geosciences,Ocean University of Qingdao,Qingdao Shandong,266003

Received Date: 2002-01-19

Abstract

New data on osmiumisotopic compositions of four seafloor massive sulfide samples from the TAG hydrothermal field has been got,the 187Os/186Os ratios of massive sulfide samples vary from2.305 to 7.879,with a mean of 5.986,these ratios are bet ween that of modern seawater and upper oceanic crust,and this range of Os isotopic compositions is likely the result of mixing of seawater with upper oceanic crust,maybe about 56 % of osmium in the massive sulfides is from the seawater,and 44 % is fromt he upper oceanic crust. The mixing of seawater with hydrothermal fluid have an obvious effect on the Os concentration and isotope composition of massive sulfi de during the seafloor hydrothermal activity.
- Os isotope,
- seafloor massive sulfide,
- TAG hydrothermal field

References

[1]	Sharma M, Papanastassiou D A, Wasserburg G J. The concentration and isotopic composition of osmium in the oceans [J]. Geochim. Cosmochim. Acta, 1997, 61: 3 287～3 299
[2]	Esser B, Turekian K K. Accretion rate of extraterrestrial particles determined from osmium isotope systematics of Pacific pelagic clay and manganese nodules[J]. Geochim. Cosmochim. Acta, 1988, 52: 1 383～1 388
[3]	Ravizza G, Turekian K K, Hay B J. The geochemistry of rhenium and osmium in recent sediments from the Black Sea[J]. Geochim. Cosmochim. Acta, 1991, 55: 3 741～3 752
[4]	Ravizza G, Turekian K K. The osmium isotopic composition of organic-rich marine sediments [J]. Earth Planet. Sci. Lett, 1992, 110: 1～6
[5]	Ravizza G, Mcmurtry G M. Osmium isotopic variations in metalliferous sediments from the East Pacific Rise and the Bauer Basin[J]. Geochim. Cosmochim. Acta, 1993, 57: 4 301～4 310
[6]	Reusch D N, Ravizza G, Maasch K A, et al. Miocean seawater 187 Os/188Os ratios inferred from metalliferous carbonates[J]. Earth Planet. Sci. Lett., 1998, 160: 163～178
[7]	Roy-Barman M, Allegre C J. 187 Os/186Os of mid-ocean ridge basalts and abyssal peridotites[J]. Geochim. Cosmochim. Acta, 1994, 58: 5 043～5 054
[8]	Martin C E. Osmium isotopic characteristics of mantle-derived rocks[J]. Geochim. Cosmochim. Acta, 1991, 55: 1 421～1 434
[9]	Ravizza G, Martin C E, German C R, et al. Os isotopes as tracers in seafloor hydrothermal systems: metalliferous deposits from the TAG hydrothermal area, 26°N Mid-Atlantic Ridge[J]. Earth Planet. Sci. Lett., 1996, 138: 105～119
[10]	Brugmann G E, Birck J L, Herzig P M, et al. Os isotopic composition and Os and Re distribution in the active mound of the TAG hydrothermal system, Mid-Atlantic Ridge[J]. Proc. ODP, Sci. Results, 1998, 158: 91～100
[11]	曾志刚,翟世奎,赵一阳等.大西洋中脊TAG热液活动区中热液沉积物的稀土元素地球化学特征[J].海洋地质与第四纪地质,1999,19:59～66[Zeng Z G, Zhai S K, Zhao Y Y, et al.Rare earth element geochemistry of hydrothermal sediment from the TAG hydrothermal field,Mid-Atlantic Ridge[J]. Marine Geology & Quaternary Geology, 1999,19(3):59～66(in Chinese with English abstract)]
[12]	曾志刚,秦蕴珊,赵一阳等.大西洋中脊TAG热液活动区海底热液沉积物的硫同位素组成及其地质意义[J].海洋与湖沼,2000,31:518～529[Zeng Z G, Qin Y S, Zhao Y Y, et al. Sulfur isotopic composition of seafloor surface hydrothermal sediments in the TAG hydrothermal field of Mid-Atlantic Ridge and its geological implications[J]. Oceanologia et Limnologia Sinica, 2000, 31(5): 518～529(in Chinese with English abstract)]
[13]	曾志刚,秦蕴珊,翟世奎.大西洋洋中脊海底表层热液沉积物的铅同位素组成及其地质意义[J].青岛海洋大学学报,2001,31:103～109[Zeng Z G, Zhai S K, Qin Y S.Lead isotope compositions of seafloor surface hydrothermal sediments in the TAG hydrothermal field of Mid-Atlantic Ridge and its geological implications[J]. Journal of Ocean University of Qingdao, 2001, 31(1):103～109(in Chinese with English abstract).
[14]	曾志刚,秦蕴珊,翟世奎.大西洋中脊TAG热液区硫化物中流体包裹体的He-Ne-Ar同位素组成[J].中国科学(D辑),2000,30(6):628～633 [Zeng Z G, Qin Y S, Zhai S K.He, Ne and Ar isotope compositions of fluid inclusions in hydrothermal sulfides from the TAG hydrothermal field,Mid-Atlantic Ridge[J]. Science in China (Series D), 2001, 44(3):221～228(in English )
[15]	Rona P A, Hannington M D, Raman C V, et al. Active and relict sea-floor hydrothermal mineralization at the TAG hydrothermal field, Mid-Atlantic Ridge[J]. Econ. Geol, 1993, 88: 1 989～2 017
[16]	Hauri E H. Major-element variability in the Hawaiian mantle plume[J]. Nature, 1996, 382: 415～419
[17]	Esser B K, Turekian K K. The osmium isotopic composition of the continental crust [J]. Geochim. Cosmochim. Acta, 1993, 57: 3 093～3 104
[18]	Sharma M, Wasserburg G J, Hofmann A W, et al. Osmium isotopes in hydrothermal fluids from the Juan de Fuca Ridge[J]. Earth and Planetary Science Letters, 2000,179:139～152
[19]	Burton K W, Bourdon B, Birck J-L, et al. Osmium isotope variations in the oceans recorded by Fe-Mn crusts[J]. Earth and Planetary Science Letters, 2000, 171:185～197
[20]	Schiano P, Birck J-L, Allegre C J. Osmium-strontium-neodymium-lead isotopic covariations in mid-ocean ridge basalt glasses and the heterogeneity of the upper mantle[J]. Earth and Planetary Science Letters, 1997, 150:363～379
[21]	Snow J E, Reisberg L. Os isotopic systematics of the MORB mantle: results from altered abyssal peridotites[J]. Earth and Planetary Science Letters, 1995, 133:411～421

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Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge

1 Institute of Oceanology,Chinese Academy of Sciences,Qingdao Shandong 266071;

2 College of Marine Geosciences,Ocean University of Qingdao,Qingdao Shandong,266003

Received Date: 2002-01-19

Key words:

Abstract: New data on osmiumisotopic compositions of four seafloor massive sulfide samples from the TAG hydrothermal field has been got,the 187Os/186Os ratios of massive sulfide samples vary from2.305 to 7.879,with a mean of 5.986,these ratios are bet ween that of modern seawater and upper oceanic crust,and this range of Os isotopic compositions is likely the result of mixing of seawater with upper oceanic crust,maybe about 56 % of osmium in the massive sulfides is from the seawater,and 44 % is fromt he upper oceanic crust. The mixing of seawater with hydrothermal fluid have an obvious effect on the Os concentration and isotope composition of massive sulfi de during the seafloor hydrothermal activity.

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Reference (21)

[1]	Sharma M, Papanastassiou D A, Wasserburg G J. The concentration and isotopic composition of osmium in the oceans [J]. Geochim. Cosmochim. Acta, 1997, 61: 3 287～3 299
[2]	Esser B, Turekian K K. Accretion rate of extraterrestrial particles determined from osmium isotope systematics of Pacific pelagic clay and manganese nodules[J]. Geochim. Cosmochim. Acta, 1988, 52: 1 383～1 388
[3]	Ravizza G, Turekian K K, Hay B J. The geochemistry of rhenium and osmium in recent sediments from the Black Sea[J]. Geochim. Cosmochim. Acta, 1991, 55: 3 741～3 752
[4]	Ravizza G, Turekian K K. The osmium isotopic composition of organic-rich marine sediments [J]. Earth Planet. Sci. Lett, 1992, 110: 1～6
[5]	Ravizza G, Mcmurtry G M. Osmium isotopic variations in metalliferous sediments from the East Pacific Rise and the Bauer Basin[J]. Geochim. Cosmochim. Acta, 1993, 57: 4 301～4 310
[6]	Reusch D N, Ravizza G, Maasch K A, et al. Miocean seawater 187 Os/188Os ratios inferred from metalliferous carbonates[J]. Earth Planet. Sci. Lett., 1998, 160: 163～178
[7]	Roy-Barman M, Allegre C J. 187 Os/186Os of mid-ocean ridge basalts and abyssal peridotites[J]. Geochim. Cosmochim. Acta, 1994, 58: 5 043～5 054
[8]	Martin C E. Osmium isotopic characteristics of mantle-derived rocks[J]. Geochim. Cosmochim. Acta, 1991, 55: 1 421～1 434
[9]	Ravizza G, Martin C E, German C R, et al. Os isotopes as tracers in seafloor hydrothermal systems: metalliferous deposits from the TAG hydrothermal area, 26°N Mid-Atlantic Ridge[J]. Earth Planet. Sci. Lett., 1996, 138: 105～119
[10]	Brugmann G E, Birck J L, Herzig P M, et al. Os isotopic composition and Os and Re distribution in the active mound of the TAG hydrothermal system, Mid-Atlantic Ridge[J]. Proc. ODP, Sci. Results, 1998, 158: 91～100
[11]	曾志刚,翟世奎,赵一阳等.大西洋中脊TAG热液活动区中热液沉积物的稀土元素地球化学特征[J].海洋地质与第四纪地质,1999,19:59～66[Zeng Z G, Zhai S K, Zhao Y Y, et al.Rare earth element geochemistry of hydrothermal sediment from the TAG hydrothermal field,Mid-Atlantic Ridge[J]. Marine Geology & Quaternary Geology, 1999,19(3):59～66(in Chinese with English abstract)]
[12]	曾志刚,秦蕴珊,赵一阳等.大西洋中脊TAG热液活动区海底热液沉积物的硫同位素组成及其地质意义[J].海洋与湖沼,2000,31:518～529[Zeng Z G, Qin Y S, Zhao Y Y, et al. Sulfur isotopic composition of seafloor surface hydrothermal sediments in the TAG hydrothermal field of Mid-Atlantic Ridge and its geological implications[J]. Oceanologia et Limnologia Sinica, 2000, 31(5): 518～529(in Chinese with English abstract)]
[13]	曾志刚,秦蕴珊,翟世奎.大西洋洋中脊海底表层热液沉积物的铅同位素组成及其地质意义[J].青岛海洋大学学报,2001,31:103～109[Zeng Z G, Zhai S K, Qin Y S.Lead isotope compositions of seafloor surface hydrothermal sediments in the TAG hydrothermal field of Mid-Atlantic Ridge and its geological implications[J]. Journal of Ocean University of Qingdao, 2001, 31(1):103～109(in Chinese with English abstract).
[14]	曾志刚,秦蕴珊,翟世奎.大西洋中脊TAG热液区硫化物中流体包裹体的He-Ne-Ar同位素组成[J].中国科学(D辑),2000,30(6):628～633 [Zeng Z G, Qin Y S, Zhai S K.He, Ne and Ar isotope compositions of fluid inclusions in hydrothermal sulfides from the TAG hydrothermal field,Mid-Atlantic Ridge[J]. Science in China (Series D), 2001, 44(3):221～228(in English )
[15]	Rona P A, Hannington M D, Raman C V, et al. Active and relict sea-floor hydrothermal mineralization at the TAG hydrothermal field, Mid-Atlantic Ridge[J]. Econ. Geol, 1993, 88: 1 989～2 017
[16]	Hauri E H. Major-element variability in the Hawaiian mantle plume[J]. Nature, 1996, 382: 415～419
[17]	Esser B K, Turekian K K. The osmium isotopic composition of the continental crust [J]. Geochim. Cosmochim. Acta, 1993, 57: 3 093～3 104
[18]	Sharma M, Wasserburg G J, Hofmann A W, et al. Osmium isotopes in hydrothermal fluids from the Juan de Fuca Ridge[J]. Earth and Planetary Science Letters, 2000,179:139～152
[19]	Burton K W, Bourdon B, Birck J-L, et al. Osmium isotope variations in the oceans recorded by Fe-Mn crusts[J]. Earth and Planetary Science Letters, 2000, 171:185～197
[20]	Schiano P, Birck J-L, Allegre C J. Osmium-strontium-neodymium-lead isotopic covariations in mid-ocean ridge basalt glasses and the heterogeneity of the upper mantle[J]. Earth and Planetary Science Letters, 1997, 150:363～379
[21]	Snow J E, Reisberg L. Os isotopic systematics of the MORB mantle: results from altered abyssal peridotites[J]. Earth and Planetary Science Letters, 1995, 133:411～421

Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge

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