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40Ar/39Ar geochronology of supergene jarosite constraints on weathering front propagation rate in the TuHa basin
Pages: 2956-2964
Year: Issue:  30
Journal: Chinese Science Bulletin

Keyword:  jarositelaser 40Ar/39Ar datingweathering front propagation rateTuHa Basin;
Abstract: Two jarosite samples with visually distinct phases collected from the oxidation zone of the Hongshan Cu-Au deposit in the TuHa Basin are dated by laser 40Ar/39 Ar incremental heating analysis. To test the age reproducibility of each sample, two aliquots are dated. The results indicate that the dates obtained are reproducible, yielding ages of 7.5 and 8.0 Ma, confirming the suitability of supergene jarosite to 40Ar/39 Ar geochronology. Combined with published ages, the obtained 40Ar/39 Ar ages decrease from the top to the bottom of the profile, which records the arrival of a weathering front at that depth, yielding a weathering front propagation rate of 2.92 m/Ma.
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