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Vol 176
Pages:
26-30
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RUS

Geochemistry of submarine ore-forming hydrotherms of the North Atlantic according to the data of remote observations and sampling from underwater manned vehicles

Authors:
S. M. Andreeva1
M. V. Krivitskaya2
D. V. Kaminskiy3
About authors
  • 1 — G.V. Plekhanov Saint Petersburg Mining Institute
  • 2 — G.V. Plekhanov Saint Petersburg Mining Institute
  • 3 — All-Russian Research Institute of Geology and Mineral Resources of the World Ocean
Date submitted:
2007-09-10
Date accepted:
2007-11-23
Date published:
2008-10-06

Abstract

Fluid and plume geochemical characteristics of Mid-Atlantic Ridge (MAR) hydrothermal fields have been compared. Similar geological traits of Logatchev and Rainbow fields are location of their discharge zones in ultramafic environments. High H 2 and СH 4 concentrations reflect the influence of serpentinization processes on forming of a fluid composition. The concentration of H2S is noticeably less in comparison with fluids of other Atlantic hydrothermal fields. Regression analysis shows that all the sulfur found out in samples from fluids and plumes of both fields is represented in the form of sulphate-ion. This lead to supposition of negative correlation of H 2 S and СH 4 . Sampling of fluids during dives on DSRV ALVIN and plumes from board of RV ATLANTIS let me to calculate the end member composition. It testifies to sharp distinctions in solution composition of Rainbow and Logatchev fields. In case of the Rainbow highly mineralized fluids are characteristic. On the Irina-2 vent of the Logatchev area solutions with distinctly less macrocomponent (first of all Na and Cl) concentrations were sampled as compared to ocean water. Quite noticeable are differences in concentrations of Fe and Mn. For Rainbow fluids the highest contents of Fe (> 1300 mg/l) and Mn (up to 123 mg/l) observed in MAR hydrothermal fields are characteristic. Concentrations of these elements in Irina-2 vent fluids decrease for the order of magnitude.

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References

  1. Богданов Ю.А. Гидротермальные рудопроявления рифтов Срединно-Атлантического хребта. М.: Научный мир, 1997. 167 с.
  2. Судариков С.М. Гидроминеральные проявления в Океане // Геодинамика и рудогенез Мирового океана / Под ред. акад. И.С.Грамберга; Всерос. науч.-исслед. ин-т геологии и минеральных ресурсов Мирового океана. СПб, 1999. С.62-72.
  3. Charlou J.L. et al. Geochemistry of high H2 and CH4 vent fluids issuing from ultramafic rocks at the Rainbow hydrothermal field (3614' N, MAR) // Chemical Geology. 2002. 191. P.345-359.
  4. Sudarikov S.M. Structure of hydrothermal plumes at the Logatchev vent field, 14°45' N, Mid-Atlantic Ridge: evidence from geochemical and geophysical data / S.M.Sudarikov, A.B.Roumiantsev // Journal of Volcanology and Geothermal Research. 2000. 101. Р.245-252.
  5. Sudarikov S. Hydrothermal Plumes along the Mid-Atlantic Ridge: Preliminary Results of CTD Investigations during the DIVERSExpedition (July 2001) / S.Sudarikov, E.Zhirnov // Inter Ridge. 2001. Vol.10(2). P.33-36.

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