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, StefanoFiorentini, Marco L.LaFlamme, CrystalHollis, Steven P.et al.
Permanent link: http://hdl.handle.net/10197/9363
Date: 23-Aug-2017
Online since: 2018-05-08T11:52:29Z
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
Other versions: http://sga2017.ca/
Language: en
Status of Item: Peer reviewed
Conference Details: SGA Quebec 2017, Quebec City, Canada, 20-23 August 2017
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Earth Sciences Research Collection
ICRAG Research Collection

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