Other
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..79..303k&link_type=abstract
Earth and Planetary Science Letters, Volume 79, Issue 3-4, p. 303-318.
Other
21
Scientific paper
Argon isotopes in fluid inclusions in quartz veins associated with granite-hosted tungsten mineralization in the southwest and north of England have been investigated in detail by the 40Ar-39Ar technique. The natural argon is present as a number of discrete components which can be identified through correlations with 39Ar, 38Ar and 37Ar induced by neutron bombardment of potassium, chlorine and calcium. The potassium-correlated component arises principally from in situ decay of potassium in solid phases in the inclusions. In the case of the Hemerdon tungsten deposit of southwest England the phases responsible are small (~ 25 μm) captive authigenic micas which are shown to have been deposited from a fluid 268 +/- 20 Ma ago, shortly after the emplacement of the host granite. The chlorine-correlated component is present in the brines which constitute the fluid phase of the inclusions. The argon in these hydrothermal fluids is made up in part of ``parentless'' or ``excess'' 40Ar leached from surrounding crustal rocks, and in part of dissolved ancient atmospheric argon. Absolute concentrations of both atmospheric and excess components in the brine can be estimated from (40Ar/Cl) ratios and independent determinations of the salinity of the inclusions. The absolute concentrations of the atmospheric argon are close to those found in modern meteoric water, while those of the excess component can be interpreted in terms of the degree of interaction betwen the circulating fluids and country rock. A calcium-correlated component, with a much higher ratio of excess to atmospheric argon than that in the brine, was found to be a dominant phase in one sample from the Hemerdon deposit, indicating the presence of a solid phase (probably a CaSO4 daughter mineral). Inclusions of this composition represent fluids which have had a more prolonged interaction- with crustal rocks. The results obtained from this study provide a systematization and a framework for future multi-component argon studies of fluid inclusions, together with an indication of the wide range of information which can be inferred.
Butterfield A. W.
Kelley Shari
Shepherd T. J.
Turner Gary
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