The mineralogy and the Isotopic Composition of Sulfur in Hydrothermal Sulfide/Sulfate Deposits on the East Pacific Rise, 21 degree N Latitude
The mineralogy of five groups of hydrothermal chimneys from the East Pacific Rise has been examined. Three of the chimneys, where the exit temperature of the hydrothermal fluids was close to 350 degree C, are rich in copper sulfides. Exit temperatures from the other two chimneys were less than 300 d...
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Veröffentlicht in: | Earth and planetary science letters 1981-01, Vol.53 (3), p.382-390 |
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Sprache: | eng |
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Zusammenfassung: | The mineralogy of five groups of hydrothermal chimneys from the East Pacific Rise has been examined. Three of the chimneys, where the exit temperature of the hydrothermal fluids was close to 350 degree C, are rich in copper sulfides. Exit temperatures from the other two chimneys were less than 300 degree C; in these, the chimney walls are rich in zinc sulfide. The major sulfides in the chimneys as a whole were found to be wurtzite, chalcopyrite, pyrite, and cubanite. Anhydrite is always the dominant sulfate, and is present in all the deposits. Silicates are also present but in relatively minor amounts. There are considerable differences in the mineralogy of sulfides, sulfates, and silicates between the active and inactive vent deposits. The isotopic composition of sulfur in anhydrites from active vents is close to that of seawater; the delta super(34)S values of the sulfides range from + 1.3 to + 4.1ppt. |
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ISSN: | 0012-821X |