Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-153-2023
https://doi.org/10.5194/gchron-5-153-2023
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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Direct dating of overprinting fluid systems in the Martabe epithermal gold deposit using highly retentive alunite
Jack Muston, Marnie Forster, Conrad Alderton, Shawn Crispin, and Gordon Lister
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Publication in GChron not foreseen
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Cited articles

Arribas, A., Cunningham, C. G., Rytuba, J. J., Rye, R. O., Kelly, W. C., Podwysocki, M. H., McKee, E. H., and Tosdal, R. M.: Geology, geochronology, fluid inclusions, and isotope geochemistry of the Rodalquilar gold alunite deposit, Spain. Econ. Geol., 90, 795–822, https://doi.org/10.2113/gsecongeo.90.4.795, 1995. 
Arribas, A., Arribas, I., Draper, G., Hall, C., Kesler S. E., McEwan, C., and Muntean, J.: 40Ar /39Ar dating of alunite from the Pueblo Viejo gold-silver district, Dominican Republic. Econ. Geol., 106, 1059–1070, https://doi.org/10.2113/econgeo.106.6.1059, 2011. 
Barber, A. J. and Crow, M. J.: Sumatra: geology, resources and tectonic evolution. Geological Society, London, Memoirs, 31, https://doi.org/10.1144/GSL.MEM.2005.031, 2005. 
Carter, J. N., Tremblay, M. M., and Mark, D. F.: A Bayesian approach to the deconvolution of 40Ar /39Ar data from mineral mixtures, Chem. Geol., 554, 119784, https://doi.org/10.1016/j.chemgeo.2020.119784, 2020. 
Cassata, W. S. and Renne, P. R.: Systematic variations of argon diffusion in feldspars and implications for thermochronometry, Geochim. Cosmochim. Ac., 112, 251–287, 2013. 
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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.