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

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doi: 10.1016/0012-821X(81)90122-9
Authors:Arnold, Michel; Sheppard, Simon M. F.
Author Affiliations:Primary:
Cent. Rech. Petrogr. et Geochim., Vandoeuvre-les-Nancy, France
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, Vol.56, p.148-156. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1981
Note:In English. 30 refs.; illus. incl. l6 anal., l table
Summary:The S-isotope composition of 16 pyrite and chalcopyrite samples from recent sulphide deposits 'Cyana' - project RITA) and active sulphide mineralization ("Alvin' - project RISE) associated with hydrothermal sources at 380 + or - 30°C on the E Pacific Rise at 21°N have been measured. The 34S/32S ratios are relatively uniform and essentially identical for both sites: delta 34S = +1.4 to 3.0per mille (CDT), mean +2.1per mille. The sulphides were analysed after the majority of the very numerous micro-inclusions of anhydrite had been removed. Two independent physicochemical analyses of the data demonstrate that approx 90% of the S was leached from the basaltic host-rocks by circulating sea-water hydrothermal fluids. [P.Br.]
Subjects:Chalcopyrite; Exhalative processes; Geochemistry; Hydrothermal alteration; Hydrothermal conditions; Isotopes; Marine sediments; Metallogeny; Metasomatism; Mid-ocean ridges; Mineral deposits, genesis; Physicochemical properties; Processes; Pyrite; S-34/S-32; Sediments; Stable isotopes; Sulfides; Sulfur; East Pacific; East Pacific Rise; Pacific Ocean; Hydrothermal processes; Ratios; RISE; RITA
Coordinates:N204900 N205500 W1090200 W1090700
Abstract Numbers:82M/2908
Record ID:1982039004
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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