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.
LaFlamme, Crystal
Hollis, Steven P.
et al.
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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 evolutionVolcanic-hosted massive sulfideNimbus
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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