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Preliminary Report on the Chemistry of Hydrothermal Solutions at 21° North, East Pacific Rise

  • K. L. Von Damm
  • B. Grant
  • J. M. Edmond
Chapter
Part of the NATO Conference Series book series (NATOCS, volume 12)

Abstract

A preliminary report is presented, of the information available to date on the chemistry of the 350° C hot springs on the EPR at 21° N. Three distinct fields were sampled by ALVIN in November 1979. The end-member solutions are completely depleted in magnesium and sulphate and are markedly acidic. The alkalies and alkaline earths are similar in their behavior to what was observed at Galapagos; however, there are significant differences. The waters are sulphide dominated with the H2S:Fe ratio being 3.5. The Fe:Mn ratio is 1.8. The vents are enriched in Zn relative to Cu with Zn:Cu equal to about 7. The strontium concentration in the end member is only a few percent above the normal sea water value. However, the isotopic composition is very similar to basalts. The large resulting flux of non-radiogenic strontium is necessary to the overall isotopic balance of the element in the oceans. The close compositional agreement between the 21°N and Galapagos solutions provides further evidence for the validity of the general calculations developed using the Galapagos data.

Keywords

Hydrothermal Solution Spreading Center Black Smoker East PACIFIC Rise Ridge Crest 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Albarede F. A. Michaud, J.F. Minster and G. Michaud (1981), “8/Sr/86Sr ratios in hydrothermal waters and deposits from the East Pacific Rise at 21°N”, Earth Planet. Sci. Lett. 55 229–236.Google Scholar
  2. Bischoff, J. L. (1980), “Geothermal system at 21°N, East Pacific Rise: Physical limits on geothermal fluid and role of adiabatic expansion”, Science 207 1465–1469.Google Scholar
  3. Bischoff, J. L. and F. W. Dickson (1975), “Seawater-Basalt interaction at 200°C and 500 bars: Implications as to the origin of sea floor heavy metal deposits and regulation of seawater chemistry”, Earth Planet. Sci. Lett. 25 385–397.Google Scholar
  4. Brass, G. W. (1976), “The variation of the marine 87Sr/86Sr ratio during Phanerozoic time: Interpretation using a flux model”, Geochim. Cosmochim. Acta 40 721–730.Google Scholar
  5. Corliss, J. B., J. Dymond, L. I. Gordon, J. M. Edmond, R. P. von Herzen, R. D. Ballard, K. Green, D. Williams, A. Bainbridge, K. Crane and T. J. H. van Andel (1979), ‘Exploration of submarine thermal springs on the Galapagos Rift“, Science 203 1073–1083.Google Scholar
  6. Edmond, J. M. (1980), ‘Ridge crest hot springs: The story so far“, EOS 61 129–131.Google Scholar
  7. Edmond, J. M., J. B. Corliss and L. I. Gordon (1979a), “Ridge crest hydrothermal metamorphism at the Galapagos Spreading Center and reverse weathering” in Ewing Symposium Vol. 2 (M. Talwani, ed.) 383–390.Google Scholar
  8. Edmond, J. M., C. Measures, R. E. McDuff, L. H. Chan, R. Collier, B. Grant, L. I. Gordon and J. B. Corliss (1979b), “Ridge crest hydrothermal activity and the balances of the major and minor elements in the ocean: The Galapagos data”, Earth Planet. Sci. Lett. 46 1–18.Google Scholar
  9. Edmond, J. M., C. Measures, B. Mangum, B. Grant, F. R. Sclater, R. Collier, A. Hudson, L. I. Gordon and J. B. Corliss (1979c), “On the formation of metal-rich deposits at ridge crests”, Earth Planet. Sci. Lett. 46 19–30.Google Scholar
  10. Kerridge, J. F. (1982), “Sulphur isotope systematics at the 21°N site, East Pacific Rise”, Earth Planet. Sci. Lett. (in press).Google Scholar
  11. McDuff, R. E. and J. M. Edmond (1982), “On the fate of sulphate during hydrothermal circulation at mid-ocean ridges”, Earth Planet. Sci. Lett. 57 117–132.Google Scholar
  12. RISE Project Group (1980), ‘last Pacific Rise: Hot springs and geophysical experiments“, Science 207 1421–1433.Google Scholar

Copyright information

© Springer Science+Business Media New York 1983

Authors and Affiliations

  • K. L. Von Damm
    • 1
  • B. Grant
    • 1
  • J. M. Edmond
    • 1
  1. 1.Department of Earth and Planetary SciencesMassachusetts Institute of TechnologyCambridgeUSA

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