Journal article

Part II. Evaluation of Ar-40-Ar-39 quartz ages: Implications for fluid inclusion retentivity and determination of initial Ar-40/Ar-36 values in Proterozoic samples

MA Kendrick, JM Miller, D Phillips

GEOCHIMICA ET COSMOCHIMICA ACTA | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2006

Abstract

The argon isotope systematics of vein-quartz samples with two different K-reservoirs have been evaluated in detail. Potassium is hosted by ultra-high-salinity fluid inclusions in quartz samples from the Eloise and Osborne iron-oxide-copper-gold (IOCG) deposits of the Mt Isa Inlier, Australia. In contrast, K is hosted by accidentally trapped mica within lower-salinity fluid inclusions of a sample selected from the Railway Fault, 13 km south of the Mt Isa copper mine, Australia. Imprecise apparent ages have been obtained for all of the samples studied and conclusively demonstrate that quartz fluid inclusions are retentive to Ar and have not leaked over billions of years. IOCG samples that host..

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