The bimodal fluid evolution of the Nimbus Zn-Ag deposit: an Archean VHMS with epithermal characteristics
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|Title:||The bimodal fluid evolution of the Nimbus Zn-Ag deposit: an Archean VHMS with epithermal characteristics||Authors:||Caruso, Stefano
Fiorentini, Marco L.
Hollis, Steven P.
|Permanent link:||http://hdl.handle.net/10197/9363||Date:||23-Aug-2017||Abstract:||The Nimbus Zn-Ag VHMS deposit represents an exceptional mineralised occurrence in the Yilgarn Craton. While other VHMS systems in the craton are restricted to paleo-rift zones, Nimbus is associated to a plume-related stratigraphy (Hollis et al., 2017). Furthermore, the epithermal characteristics resulting from low temperature and shallow water conditions allowed the development of an unusual mineralisation dominated by Ag-rich sulfosalts. In this study we take advantage of state-of-the-art in-situ techniques to investigate the fluid evolution of this peculiar VHMS system. From the trace element compositions and S-isotope signatures we suggest that Nimbus experienced a bimodal fluid evolution consisting of (i) an initial intense interaction between deep-magmatic fluids and seawater that developed barren pyritic lenses, and (ii) a subsequent closure of the hydrothermal system during which the Agrich ore formed sourcing sulfur almost entirely from a deepmagmatic source.||Type of material:||Conference Publication||Publisher:||Society for Geology Applied to Mineral Deposits||Keywords:||Bimodal fluid evolution; Volcanic-hosted massive sulfide; Nimbus||Language:||en||Status of Item:||Peer reviewed||Conference Details:||SGA Quebec 2017, Quebec City, Canada, 20-23 August 2017|
|Appears in Collections:||Earth Sciences Research Collection|
ICRAG Research Collection
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