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Metallic-Pb nanospheres in zircon from the Challenger Au deposit, South Australia: probing metamorphic and ore formation histories
Published online by Cambridge University Press: 02 November 2021
Abstract
Ancient metamorphic processes are recorded by the formation of metallic-Pb nanospheres in zircon, a product of internal Pb mobilisation and thermally driven concentration. Here, metallic-Pb nanospheres formed within an ore deposit are characterised for the first time using high-angle annular dark field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy element-distribution mapping. Exceptional examples from the migmatite-hosted Archean–Paleoproterozoic Challenger Au deposit (Central Gawler Craton, South Australia) support widespread metallic-Pb nanosphere formation in zircon from rocks experiencing granulite-facies metamorphism. We also report new trace-element associations found with metallic-Pb nanospheres and a new mode of occurrence, in which Sc ‘haloes’ form adjacent to metallic-Pb nanospheres within the crystalline zircon lattice. This differs to previously characterised examples of metallic-Pb nanospheres associated with amorphous Si-rich glasses and unidentified Al–Ti, or Fe-bearing phases. Multiple modes of metallic-Pb nanosphere occurrences and trace-element associations suggests multiple modes of formation, probably dependant on zircon composition and metamorphic conditions. Identification of metallic-Pb nanospheres in a growing range of geological settings further highlights the mobility of Pb in zircon and the importance of detailed, nanoscale mineral characterisation, in order to constrain accurate geochronological histories for rocks within high-temperature geological environments.
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- Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland
Footnotes
Associate Editor: Thomas Mueller
References
Arcuri, G.A., Moser, D.E., Reinhard, D.A., Langelier, B. and Larson, D.J. (2020) Impact-triggered nanoscale Pb clustering and Pb loss domains in Archean zircon. Contributions to Mineralogy and Petrology, 175, 59.CrossRefGoogle Scholar
Betts, P.G. and Giles, D. (2006) The 1800–1100 Ma tectonic evolution of Australia. Precambrian Research, 144, 92–125.CrossRefGoogle Scholar
Clark, L.A. (1960). The Fe–As–S system: Phase relations and applications. Economic Geology, 55, 1345–1381.CrossRefGoogle Scholar
Courtney-Davies, L., Ciobanu, C.L., Verdugo-Ihl, M.R., Slattery, A., Cook, N.J., Dmitrijeva, M., Keyser, W., Wade, B.P., Domnick, U.I., Ehrig, K., Xu, J. and Kontonikas-Charos, A. (2019) Zircon at the nanoscale records metasomatic processes leading to large magmatic–hydrothermal ore systems. Minerals, 9, 364.CrossRefGoogle Scholar
Ge, R.F., Wilde, S.A., Nemchin, A.A., Whitehouse, M.J., Bellucci, J.J. and Erickson, T.M. (2019) Mechanisms and consequences of intra-crystalline enrichment of ancient radiogenic Pb in detrital Hadean zircons from the Jack Hills, Western Australia. Earth and Planetary Science Letters, 517, 38–49.CrossRefGoogle Scholar
Haese, R. (2010) Ore Mineralogy and Geochemistry in the M2 Orebody, Challenger, SA: Implication for Gold Distribution and Remobilization. Unpublished honours thesis, The University of Adelaide, Australia.Google Scholar
Halpin, J.A. and Reid, A.J. (2016) Earliest Paleoproterozoic high-grade metamorphism and orogenesis in the Gawler Craton, South Australia: The southern cousin in the Rae family? Precambrian Research, 276, 123–144.CrossRefGoogle Scholar
Hiess, J., Condon, D.J., McLean, N. and Noble, S.R. (2012) 238U/235U systematics in terrestrial uranium-bearing minerals. Science, 335, 1610–1614.CrossRefGoogle ScholarPubMed
Kusiak, M.A., Dunkley, D.J., Wirth, R., Whitehouse, M.J., Wilde, S.A. and Marquardt, K. (2015) Metallic lead nanospheres discovered in ancient zircons. Proceedings of the National Academy of Science, 112, 4958–4963.CrossRefGoogle ScholarPubMed
Kusiak, M.A., Wilde, S.A., Wirth, R., Whitehouse, M.J., Dunkley, D.J., Lyon, I., Reddy, S.M., Berry, A. and de Jonge, M. (2017) Detecting micro- and nanoscale variations in element mobility in high-grade metamorphic rocks: implication for precise U-Pb dating of zircon. Pp. 277–291 in: Microstructural Geochronology: Planetary Records Down to Atom Scale (Moser, D.E., Corfu, F., Darling, J.R., Reddy, S.M., Tait, K., editors). Geophysical Monograph Series. John Wiley & Sons, Inc., Hoboken, New Jersey, USA.CrossRefGoogle Scholar
Kusiak, M.A., Dunkley, D.J., Wirth, R., Whitehouse, M.J. and Wilde, S.A. (2019) Lead on the nanoscale in metamorphosed zircon. Geophysical Research abstracts 2019, 21, 1–1.Google Scholar
Kusiak, M.A., Wirth, R., Dunkley, D.J., Shumlansky, L., Whitehouse, M.J. and Wilde, S.A. (2020) Pb nanospheres in metamorphic zircon. Goldschmidt Abstract 2020, https://doi.org/10.46427/gold2020.1391.CrossRefGoogle Scholar
Lyon, I.C., Kusiak, M.A., Wirth, R., Whitehouse, M.J., Dunkley, D.J., Wilde, S.A., Schaumlöffel, D., Malherbe, J. and Moore, K.L. (2019) Pb-nanospheres in ancient zircon yield model ages for zircon formation and Pb mobilization. Scientific Reports, 9, 13702.CrossRefGoogle ScholarPubMed
McFarlane, C.R.M. (2006) Palaeoproterozoic evolution of the Challenger Au deposit, South Australia, from monazite geochronology. Journal of Metamorphic Geology, 24, 75–87.CrossRefGoogle Scholar
McFarlane, C.R.M., Mavrogenes, J.A. and Tomkins, A.G. (2007) Recognizing hydrothermal alteration through a granulite facies metamorphic overprint at the challenger Au deposit, South Australia. Chemical Geology, 243, 64–89.CrossRefGoogle Scholar
Parker, A.J. (1993) Palaeoproterozoic: The Geology of South Australia. The Precambrian, South Australian Geological Survey Bulletin, 54, 50–105.Google Scholar
Paton, C., Hellstrom, J., Paul, B., Woodhead, J. and Hergt, J. (2011) Iolite: freeware for the visualisation and processing of Mass spectrometric data. Journal of Analytical Atomic Spectrometry, 26, 2508–2518.CrossRefGoogle Scholar
Peterman, E.M., Reddy, S.M., Saxey, D.W., Fougerouse, D., Snoeyenbos, D.R. and Rickard, W.D.A. (2019) Nanoscale processes of trace element mobility in metamorphosed zircon. Contributions to Mineralogy and Petrology, 174, 92.CrossRefGoogle Scholar
Piazolo, S., La Fontaine, A., Trimby, P., Harley, S., Yang, L., Armstrong, R and Cariney, J.M. (2016) Deformation-induced trace element redistribution in zircon revealed using atom probe tomography. Nature Communications, 7, 20490.CrossRefGoogle ScholarPubMed
Reid, A. (2019) The Olympic Cu-Au Province, Gawler Craton: a review of the lithospheric architecture, geodynamic setting, alteration systems, cover successions and prospectivity. Minerals, 9, 371.CrossRefGoogle Scholar
Reid, A.J. and Fabris, A. (2015) Influence of preexisting low metamorphic grade sedimentary successions on the distribution of Iron Oxide Copper-Gold mineralization in the Olympic Cu-Au Province, Gawler Craton. Economic Geology, 110, 2147–2157.CrossRefGoogle Scholar
Reid, A.J., Jagodzinski, E.A., Fraser, G.L. and Pawley, M.J. (2014) SHRIMP U-Pb zircon age constraints on the tectonics of the Neoarchean to early Paleoproterozoic transition within the Mulgathing Complex, Gawler Craton, South Australia. Precambrian Research, 250, 27–49.CrossRefGoogle Scholar
Swain, G., Woodhouse, A., Hand, M., Barovich, K., Schwarz, M. and Fanning, C.M. (2005) Provenance and tectonic development of the late Archaean Gawler Craton, Australia; U–Pb zircon, geochemical and Sm–Nd isotopic implications. Precambrian Research, 141, 106–136.CrossRefGoogle Scholar
Teasdale, J. (1997) Methods for Understanding Poorly Exposed Terranes: The Interpretive Geology and Tectonothermal Evolution of the Western Gawler Craton. PhD thesis, The University of Adelaide, Australia.Google Scholar
Tomkins, A.G. and Mavrogenes, J.A. (2001) Redistribution of gold within arsenopyrite and löllingite during pro- and retrograde metamorphism: application to timing of mineralization. Economic Geology, 96, 525–534.CrossRefGoogle Scholar
Tomkins, A.G. and Mavrogenes, J.A. (2002) Mobilization of gold as a polymetallic melt during pelite anatexis at the Challenger deposit, South Australia: a metamorphosed Archean gold deposit. Economic Geology, 97, 1249–1271.Google Scholar
Tomkins, A.G. and Mavrogenes, J.A. (2003) Generation of metal-rich felsic magmas during crustal anatexis. Geology, 31, 765–768.CrossRefGoogle Scholar
Tomkins, A.G., Dunlap, W.J. and Mavrogenes, J.A. (2004) Geochronological constraints on the polymetamorphic evolution of the granulite-hosted Challenger gold deposit: implications for assembly of the northwest Gawler Craton. Australian Journal of Earth Sciences, 51, 1–14.CrossRefGoogle Scholar
Valley, J.W., Cavosie, A.J., Ushikubo, T., Reinhard, D.A., Lawrence, D.F., Larson, D.J., Clifton, P.H., Kelly, T.F., Wilde, S.A., Moser, D.E. and Spicuzza, M.J. (2014) Hadean age for a post- magma-ocean zircon confirmed by atom probe tomography. Nature Geoscience, 7, 219–223.CrossRefGoogle Scholar
Valley, J.W., Reinhard, D.A., Cavosie, A.J., Ushikubo, T., Lawrence, D.F., Larson, D.J., Kelly, T.F., Snoeyenbos, D.R. and Strickland, A. (2015) Nano- and micro-geochronology in Hadean and Archean zircons by atom probe tomography and SIMS: new tools for old minerals. American Mineralogist, 100, 1355–1377.CrossRefGoogle Scholar
Vermeesch, P. (2018) IsoplotR: a free and open toolbox for geochronology. Geoscience Frontiers, 9, 1479–1493.CrossRefGoogle Scholar
Whitehouse, M.J., Kusiak, M.A., Wirth, R. and Ravindra Kumar, G.R. (2017) Metallic Pb nanospheres in ultra-high temperature metamorphosed zircon from southern India. Mineralogy and Petrology, 111, 467–474.CrossRefGoogle Scholar
Courtney-Davies et al. supplementary material
Courtney-Davies et al. supplementary material
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