Geochronology
Geochronology
GChron
Articles | Volume 5, issue 1
Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-153-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-5-153-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 5, issue 1
Research article
 | 
12 Apr 2023
Research article |  | 12 Apr 2023

Direct dating of overprinting fluid systems in the Martabe epithermal gold deposit using highly retentive alunite

Jack Muston, Marnie Forster, Davood Vasegh, Conrad Alderton, Shawn Crispin, and Gordon Lister

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Short summary
About 2 million years ago, rich gold deposits formed at Martabe, on the island of Sumatra in Indonesia. Fluids may have moved as the result of fault dilation caused by changes in stress orientation during the earthquake cycle, so to work out exactly when and how long between cycles, we dated a potassium-bearing mineral, alunite, using argon geochronology in association with diffusion experiments during temperature-controlled furnace step-heating, showing two episodes 250 thousand years apart.
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