40Ar/1b39 Ar laser microprobe study of fluids in different colour zones of a hydrothermal scheelite crystal from the Dae Hwa WMo mine, South Korea

R. Burgess, R. P. Taylor, A. E. Fallick, S. P. Kelley

Research output: Contribution to journalArticlepeer-review

Abstract

Laser probe analyses of Ar isotopes in fluid inclusions in five neutron-irradiated zones from a single scheelite crystal indicate the presence of two fluid components: (1) a Cl-rich hydrothermal fluid containing excess 40Ar; and (2) a meteoric fluid containing dissolved Ar with a 40Ar 36Ar ratio similar to the atmospheric value, and low Cl content. Core to rim variations indicate increasing dilution of the hydrothermal fluid with the meteoric component; however, the expected decrease in 40Ar 36Ar ratio is not recorded. At present the explanation of this is not clear; however, two possibilities are that either the dilution was accompanied by a complex process of boiling and fluid mixing, or that the 40Ar 36Ar ratio of the hydrothermal fluid increased with time due to leaching or diffusive loss of 40Ar from country rock minerals within the hydrothermal system, without significant addition of Cl.

Original languageEnglish
Pages (from-to)259-267
Number of pages9
JournalChemical Geology
Volume102
Issue number1-4
DOIs
Publication statusPublished - 15 Dec 1992

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