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    Mechanisms for the generation of HREE mineralization in carbonatites: Evidence from Huanglongpu, China.

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    Authors
    Smith, M
    Cangelosi, D
    Yardley, B
    Wenlei Song, CX
    Spratt, J cc
    Issue date
    2019-12-30
    Submitted date
    2019-09-03
    Subject Terms
    Huanglongpu
    carbonatites
    HREE
    
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    Abstract
    The Hunaglongpu carbonatites, Qinling Mountains, China, are exceptional as they form both an economic Mo resource, and are enriched in the HREE compared to typical carbonatites, giving a metal profile that may closely match projected future demand. The carbonatites at the level currently exposed appear to be transitional between magmatic and hydrothermal processes. The multistage dykes and veins are cored by quartz which hosts a fluid inclusion assemblage with a high proportion of sulphate daughter or trapped minerals, and later stage, cross-cutting veins are rich in barite-celestine. The REE mineral paragenesis evolves from monazite, through apatite and bastnäsite to Ca-REE fluorcabonates, with an increase in HREE enrichment at every stage. Radio-isotope ratios are typical of enriched mantle sources and sulphur stable isotopes are consistent with magmatic S sources. However, Mg stable isotopes are consistent with a component of recycled subducted marine carbonate in the source region, The HREE enrichment is a function of both unusual mantle source for the primary magmas and REE mobility and concentration during post-magmatic modification in a sulphate-rich hydrothermal system. Aqueous sulphate is a none specific ligand for the REE, and this coupled with crystal fraction lead to HREE enrichment during subsolidus alteration.
    Citation
    Smith, Martin; Cangelosi, Delia; Yardley, Bruce; Kynicky, Jindrich; Xu, Chen; Song, Wenlei & Spratt, John. (2019) Mechanisms for the generation of HREE mineralization in carbonatites: Evidence from Huanglongpu, China. Proceedings of the 15th SGA Biennial Meeting, 27-30 August 2019, Glasgow , Scotland.
    Publisher
    The Society for Geology Applied to Mineral Deposits
    Journal
    Proceedings of the 15th SGA Biennial Meeting
    URI
    http://hdl.handle.net/10141/622735
    Additional Links
    https://www.sga2019glasgow.com/abstract
    Type
    Conference Proceedings
    Item Description
    The attached document is the authors’ submitted version of these conference proceedings. You are advised to consult the publisher’s version if you wish to cite from it.
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