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Surge of ore metals in seawater and increased bio-activity: a tracer of VHMS mineralization in Archaean successions, Yilgarn Craton, Western Australia

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Abstract

The Nimbus Ag–Zn(–Au) deposit is a hybrid VHMS deposit with epithermal characteristics formed in the Eastern Goldfields Superterrane, Yilgarn Craton, under shallow water (~ 700 mbsl), low-temperature conditions. Intersections of some ore lenses are high-grade and polymetallic, making similar styles of mineralization attractive Yilgarn exploration targets. The mineralization at Nimbus is hosted by a bimodal felsic–mafic succession of volcanic rocks, which are overlain by a succession of least-altered polymict conglomerates with a carbonaceous to dacitic matrix. A new Re–Os age (2680 ± 34 Ma; nodular pyrite and black shale) suggests that the overlying polymict conglomerate is coeval to ~ 2.70 Ga volcanism and mineralization at Nimbus. The pyrite within the high-grade polymetallic sulfide assemblages has a consistently lower Sb/Ag ratio (1–30) than pyrite from other sulfide phases (e.g., 30 to 1000 in colloform and barren pyrite). Trace elements (TEs) in sedimentary nodular pyrite from multiple intervals along a single drillhole (NBDH010), indicate the existence of an enriched sedimentary interval with higher total TE content, Ag/Au and Sb/Au, lower S/Se, and polymetallic-like signature of Sb/Ag. Within this enriched interval, the black shale matrix of the polymict conglomerate shows higher total organic carbon (TOC), Mo content, and Co/Ni ratios and suggest increased bio-activity at that time, interpreted to be associated with the Ag–Zn(–Au) mineralization. The TE characteristics in sedimentary pyrite, reflecting increased metal content in seawater inferred from in situ pyrite trace element analysis has the potential to be developed into an exploration tool for successions, adjacent and coeval to similar ore deposits.

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Acknowledgments

The authors acknowledge Mark Rigby and Andrew Pumphrey from MacPhersons Resources Ltd. for access to samples, drill core, and internal data; GSWA core library for access to drill core; Dr. Jeffrey Steadman and Dr. Stefano Caruso for access to samples and scientific assistance; Thermo Fisher, GSWA, and MRIWA for financial support; and the John de Laeter Centre, Curtin University and UWA for the facilities, scientific, and technical assistance. We thank Dr. George Hudak, Dr. Bernd Lehmann, Dr. Thomas Monecke, and an anonymous reviewer whose comments helped improve and clarify this manuscript.

Funding

JdLC facilities are supported by a university-government consortium, ARC and AuScope via NCRIS. GeoHistory Facility instruments in the John de Laeter Centre, Curtin University were funded via an Australian Geophysical Observing System grant provided to AuScope Pty Ltd. by the AQ44 Australian Education Investment Fund program. The NPII multi-collector was obtained via funding from the Australian Research Council LIEF program (LE150100013).

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Correspondence to Vitor R. Barrote.

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Editorial handling: T. Monecke

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Barrote, V.R., Tessalina, S.G., McNaughton, N.J. et al. Surge of ore metals in seawater and increased bio-activity: a tracer of VHMS mineralization in Archaean successions, Yilgarn Craton, Western Australia. Miner Deposita 56, 643–664 (2021). https://doi.org/10.1007/s00126-020-00986-6

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  • DOI: https://doi.org/10.1007/s00126-020-00986-6

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