40Ar/39Ar dating of pyrite from gold deposits in low grade terranes.

J.McL. Miller; D. Phillips; J.. MacCulloch

doi:10.1071/ASEG2006ab113

ISSN: 2202-0586
E-ISSN:

oa ⁴⁰Ar/³⁹Ar dating of pyrite from gold deposits in low grade terranes.
Authors J.McL. Miller^a, D. Phillips^b and J.. MacCulloch^c
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^a School of Earth SciencesThe University of Melbourne, [email protected] ^b School of Earth SciencesThe University of Melbourne, [email protected] ^c School of Earth SciencesThe University of Melbourne, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 2
DOI: https://doi.org/10.1071/ASEG2006ab113
- Published online: 01 Dec 2006

Abstract

⁴⁰Ar/³⁹Ar dating of fine-grained white micas from gold deposits, formed under low-grade metamorphic conditions, is often complicated by multiple mica populations, recoil loss/redistribution of ³⁹ArK and loss of ⁴⁰Ar. Recent studies have suggested that pyrite armours enclosed mica inclusions against argon loss and, therefore, may provide improved age information in low grade terranes.

This premise is tested by applying the ⁴⁰Ar/³⁹Ar pyrite dating method to three gold deposits in Victoria, namely Stawell, Fosterville and Walhalla. These analyses indicate that, although pyrite behaves as a partially closed system, the method is able to ‘see through’ younger hydrothermal overprints. At the same time, ⁴⁰Ar/³⁹Ar analyses of pyrite from the Fosterville gold mine failed to constrain the timing of gold deposition due to the encapsulation of detritai mica grains by the pyrite. These results emphasize the importance of petrological control on sample selection and combining ⁴⁰Ar/³⁹Ar analyses of pyrite and matrix mica.

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References

Phillips, D., and Miller, J.McL., 2006, Testing time for the fool’s clock: 40Ar/39Ar dating of thermally overprinted pyrite. Geology (in review).
Fergusson, C.L., and Phillips, D., 2001, 40Ar/39Ar and K-Ar age constraints on the timing of regional metamorphism, south coast of New South Wales, Lachlan Fold Belt: problems and implications: Australian Journal of Earth Sciences, v.48, 395-408.
Reid, A.J., Fowler, A.P., Phillips, D. and Wilson, C.J.L. (2005). Thermochronology of the Yidun Arc, central eastern Tibetan Plateau: constraints from 40Ar/39Ar K-feldspar and apatite fission track data. Journal of Asian Earth Sciences, 25, 915-935.
Renne, P.R., Owens, T.L., De Paolo, D.J., Swisher, C.C., Deino, A.L. and Karner, D.B., 1998, Intercalibration of standards, absolute ages and uncertainties in 40Ar/39Ar dating, Chemical Geology, 145, pp. 117-152.
Steiger, R.H., and Jager, E., 1977, Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology. Earth and Planetary Science Letters, 36, pp. 359-362.
Smith, P.E., Evensen, N.M., York, D., Szatmari, P. and de Oliveira, D.C., 2001, Single-crystal 40Ar-39Ar dating of pyrite: No fool’s clock: Geology, v. 29, p. 403-406.

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Article Type: Research Article

Keyword(s): 40Ar/39Ar; geochronology; pyrite. gold

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oa 40Ar/39Ar dating of pyrite from gold deposits in low grade terranes.

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oa ⁴⁰Ar/³⁹Ar dating of pyrite from gold deposits in low grade terranes.