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. | 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 evolution; Volcanic-hosted massive sulfide; Nimbus | 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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