East Pacific Rise at latitude 21°N: isotopic composition and origin of the hydrothermal sulphur

Details East Pacific Rise at latitude 21°N: isotopic composition and origin of the hydrothermal sulphur East Pacific Rise at latitude 21°N: isotopic composition and origin of the hydrothermal sulphur

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56..148a&link_type=abstract

Earth and Planetary Science Letters, Volume 56, p. 148-156.

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26

Scientific paper

The sulphur isotope composition of 16 pyrite and chalcopyrite samples from recent sulphide deposits (``Cyana''-project RITA) and active sulphide mineralisation (``Alvin''-project RISE) associated with hydrothermal sources at 380+/-30°C on the East Pacific Rise at latitude 21°N have been measured. The 34S/32S ratios are relatively uniform and essentially identical for both sites: δ34S=+1.4 to 3.0%. (CDT), mean +2.1‰. The sulphides were analysed after the majority of the very numerous micro-inclusions of anhydrite had been removed.
Two independent physico-chemical analyses of the data demonstrate that about 90% of the sulphur was leached from the basaltic host rocks by the circulating seawater-hydrothermal fluids.

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