Show simple item record

dc.contributor.authorWu, Y.
dc.contributor.authorEvans, Katy
dc.contributor.authorHu, S.
dc.contributor.authorFougerouse, Denis
dc.contributor.authorZhou, M.
dc.contributor.authorFisher, L.A.
dc.contributor.authorGuagliardo, P.
dc.contributor.authorLi, J.
dc.date.accessioned2023-04-20T07:42:53Z
dc.date.available2023-04-20T07:42:53Z
dc.date.issued2021
dc.identifier.citationWu, Y. and Evans, K. and Hu, S. and Fougerouse, D. and Zhou, M. and Fisher, L.A. and Guagliardo, P. et al. 2021. Decoupling of Au and As during rapid pyrite crystallization. Geology. 49 (7): pp. 827-831.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/91629
dc.identifier.doi10.1130/G48443.1
dc.description.abstract

Gold (Au) is largely hosted by pyrite in a variety of hydrothermal systems, but the incorporation of Au into pyrite under disequilibrium conditions remains poorly understood. We integrate synchrotron X-ray fluorescence microscopy, electron backscatter diffraction, nanoscale secondary ion mass spectrometry, and laser ablation–multicollector–inductively coupled plasma–mass spectrometry to constrain the processes that sequester Au into zoned pyrite in the hydrothermal cement of breccia ores from the world-class Daqiao orogenic Au deposit, central China. Euhedral pyrite cores with oscillatory and sector zoning, variable δ34S values, and lower Au-As contents than the mantles are attributed to crystallization during oxidation of metal-depleted ore fluids with local variation in fluid conditions. The isotopically uniform colloform mantles are formed by pyrite crystallites separated by low-angle boundaries and are characterized by unusual decoupling of Au and As. Mantle formation is attributed to rapid disequilibrium precipitation from a metal-rich FeS2-supersaturated fluid. Incorporation of Au into the pyrite mantles was facilitated by abundant lattice defects produced by rapid nucleation. Gold-As–poor pyrite rims were deposited from an evolved ore fluid or other metal-depleted fluids. These results show that chemical variations recorded by fine layering within minerals can provide valuable insights into disequilibrium mass transfer and ore formation. The decoupling between Au and As in pyrite mantles indicates that As is not always a reliable proxy for Au enrichment in rapidly crystallized porous pyrite.

dc.languageEnglish
dc.publisherGEOLOGICAL SOC AMER, INC
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DE190101307
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeology
dc.subjectGOLD DEPOSIT
dc.subjectSULFUR
dc.subjectDISEQUILIBRIUM
dc.subjectPRECIPITATION
dc.subjectFRACTIONATION
dc.subjectISOTOPES
dc.subjectTEXTURES
dc.subjectSULFIDE
dc.titleDecoupling of Au and As during rapid pyrite crystallization
dc.typeJournal Article
dcterms.source.volume49
dcterms.source.number7
dcterms.source.startPage827
dcterms.source.endPage831
dcterms.source.issn0091-7613
dcterms.source.titleGeology
dc.date.updated2023-04-20T07:42:52Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidFougerouse, Denis [0000-0003-3346-1121]
curtin.contributor.orcidEvans, Katy [0000-0001-5144-4507]
curtin.contributor.researcheridEvans, Katy [G-5748-2011]
dcterms.source.eissn1943-2682
curtin.contributor.scopusauthoridFougerouse, Denis [56418452200]
curtin.contributor.scopusauthoridEvans, Katy [55500036700]
curtin.repositoryagreementV3


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record