Platinum-group element and Au geochemistry of Late Archean to Proterozoic calc-alkaline and alkaline magmas in the Yilgarn Craton, Western Australia
dc.contributor.author | Choi, E | |
dc.contributor.author | Fiorentini, ML | |
dc.contributor.author | Hughes, HSR | |
dc.contributor.author | Giuliani, A | |
dc.date.accessioned | 2020-08-06T11:02:05Z | |
dc.date.issued | 2020-07-31 | |
dc.description.abstract | The Yilgarn Craton of Western Australia is one of the largest Archean cratons in the world and is well-known for its metal endowment. In order to provide new insights into its metallogenic fertility and the nature of the upper mantle that lies underneath the craton, this study investigates the poorly constrained platinum-group element (PGE) and gold signatures of a selected suite of calc-alkaline lamprophyres, ultramafic lamprophyres, carbonatites and orangeites, ranging in age from the Proterozoic to the Late Archean. Proterozoic ultramafic lamprophyres and carbonatites within the Eastern Goldfields Superterrane (EGS) of the Yilgarn Craton have anomalously low PGE contents (Ir = 0.1–1.3 ppb; Ru = < 0.08 to 3.6 ppb; Rh = <0.04 to 0.4 ppb; Pt = <0.17 to 3.3 ppb; Pd = <0.12 to 4.4 ppb) and variable Au contents (<0.4 to 9.8 ppb). Based on their low PGE contents and unfractionated PGE patterns with (Pd/Ir)N ratios up to ~6, it is suggested that these magmas may derive from extremely low-degree partial melting of the convective mantle. Conversely, the Late Archean calc-alkaline lamprophyres in the EGS exhibit comparatively fractionated PGE patterns with (Pd/Ir)N ratios up to ~27 and variable Au concentrations, including localised anomalous enrichments (up to 13.8 ppb). The fractionated PGE patterns are explained by incongruent melting of mantle sulfides with potential contribution from PPGE- and Au-bearing alloys, which would preferentially contribute Pt, Pd and Au over Ir, Ru and Rh. Combination of elevated Au and volatile contents in these rocks is consistent with derivation from a mantle source that was metasomatised by slab-derived fluids along a laterally extensive Late Archean subduction setting. This process may have provided a first-order control on the exceptional gold endowment of the Eastern Goldfields Superterrane. | en_GB |
dc.description.sponsorship | Australian Government Research Training Program | en_GB |
dc.description.sponsorship | Australian Research Council (ARC) | en_GB |
dc.description.sponsorship | Minerals Research Institute of Western Australia | en_GB |
dc.identifier.citation | Article 105716 | en_GB |
dc.identifier.doi | 10.1016/j.lithos.2020.105716 | |
dc.identifier.grantnumber | CE1100001017 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/122355 | |
dc.language.iso | en | en_GB |
dc.publisher | Elsevier | en_GB |
dc.rights.embargoreason | Under embargo until 31 July 2021 in compliance with publisher policy | en_GB |
dc.rights | © 2020. This version is made available under the CC-BY-NC-ND 4.0 license: https://creativecommons.org/licenses/by-nc-nd/4.0/ | en_GB |
dc.subject | Platinum-group element | en_GB |
dc.subject | Gold | en_GB |
dc.subject | Calc-alkaline and alkaline magmatism | en_GB |
dc.subject | Yilgarn Craton | en_GB |
dc.subject | Late Archean | en_GB |
dc.subject | Proterozoic | en_GB |
dc.title | Platinum-group element and Au geochemistry of Late Archean to Proterozoic calc-alkaline and alkaline magmas in the Yilgarn Craton, Western Australia | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2020-08-06T11:02:05Z | |
dc.identifier.issn | 0024-4937 | |
exeter.article-number | 105716 | en_GB |
dc.description | This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record | en_GB |
dc.identifier.journal | Lithos | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | en_GB |
dcterms.dateAccepted | 2020-07-27 | |
rioxxterms.version | AM | en_GB |
rioxxterms.licenseref.startdate | 2020-07-27 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2020-08-06T10:59:20Z | |
refterms.versionFCD | AM | |
refterms.panel | B | en_GB |
Files in this item
This item appears in the following Collection(s)
Except where otherwise noted, this item's licence is described as © 2020. This version is made available under the CC-BY-NC-ND 4.0 license: https://creativecommons.org/licenses/by-nc-nd/4.0/