REE-, Sr-, Ca-aluminum-phosphate-sulfate minerals of the alunite supergroup and their role as hosts for radionuclides

Nicholas D. Owen, Nigel J. Cook, Mark Rollog, Kathy J. Ehrig, Danielle S. Schmandt, Rahul Ram, Joël Brugger, Cristiana L. Ciobanu, Benjamin Wade, Paul Guagliardo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Aluminum-phosphate-sulfate (APS) minerals of the alunite supergroup are minor components of uranium-bearing copper ores from the Olympic Dam deposit, South Australia. They typically represent a family of paragenetically late replacement phases after pre-existing REE-bearing phosphates (fluorapatite, monazite, and xenotime). Characterization with respect to textures and composition allows two groups to be distinguished: Ca-Sr-dominant APS minerals that fall within the woodhouseite and svanbergite compositional fields; and a second REE- and phosphate-dominant group closer to florencite in composition. All phases nevertheless display extensive solid solution among end-members in the broader APS clan and show extensive compositional zoning at the grain-scale. Samples representative of the deposit (flotation concentrate and tailings), as well as those that have been chemically altered during the processing cycle (acid leached concentrate), were studied for comparison. NanoSIMS isotope mapping provides evidence that the APS minerals preferentially scavenge and incorporate daughter radionuclides of the 238U decay chain, notably 226Ra and 210Pb, both over geological time within the deposit and during ore processing. These data highlight the role played by minor phases as hosts for geologically mobile deleterious components in ores as well as during mineral processing. Moreover, Sr-Ca-dominant APS minerals exhibit preferential sorption of Pb from fluid sources, in the form of both common Pb and 210Pb, for the first time revealing potential pathways for 210Pb elimination and reduction from ore processing streams.

Original languageEnglish
Pages (from-to)1806-1819
Number of pages14
JournalAmerican Mineralogist
Volume104
Issue number12
DOIs
Publication statusPublished - 18 Dec 2019

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Sulfate minerals
Phosphate minerals
alunite
Radioisotopes
radioactive isotopes
radionuclide
sulfates
phosphates
rare earth element
aluminum
minerals
phosphate
Ore treatment
sulfate
Bearings (structural)
mineral
Deposits
Ores
Phosphates
deposits

Cite this

Owen, Nicholas D. ; Cook, Nigel J. ; Rollog, Mark ; Ehrig, Kathy J. ; Schmandt, Danielle S. ; Ram, Rahul ; Brugger, Joël ; Ciobanu, Cristiana L. ; Wade, Benjamin ; Guagliardo, Paul. / REE-, Sr-, Ca-aluminum-phosphate-sulfate minerals of the alunite supergroup and their role as hosts for radionuclides. In: American Mineralogist. 2019 ; Vol. 104, No. 12. pp. 1806-1819.
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abstract = "Aluminum-phosphate-sulfate (APS) minerals of the alunite supergroup are minor components of uranium-bearing copper ores from the Olympic Dam deposit, South Australia. They typically represent a family of paragenetically late replacement phases after pre-existing REE-bearing phosphates (fluorapatite, monazite, and xenotime). Characterization with respect to textures and composition allows two groups to be distinguished: Ca-Sr-dominant APS minerals that fall within the woodhouseite and svanbergite compositional fields; and a second REE- and phosphate-dominant group closer to florencite in composition. All phases nevertheless display extensive solid solution among end-members in the broader APS clan and show extensive compositional zoning at the grain-scale. Samples representative of the deposit (flotation concentrate and tailings), as well as those that have been chemically altered during the processing cycle (acid leached concentrate), were studied for comparison. NanoSIMS isotope mapping provides evidence that the APS minerals preferentially scavenge and incorporate daughter radionuclides of the 238U decay chain, notably 226Ra and 210Pb, both over geological time within the deposit and during ore processing. These data highlight the role played by minor phases as hosts for geologically mobile deleterious components in ores as well as during mineral processing. Moreover, Sr-Ca-dominant APS minerals exhibit preferential sorption of Pb from fluid sources, in the form of both common Pb and 210Pb, for the first time revealing potential pathways for 210Pb elimination and reduction from ore processing streams.",
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Owen, ND, Cook, NJ, Rollog, M, Ehrig, KJ, Schmandt, DS, Ram, R, Brugger, J, Ciobanu, CL, Wade, B & Guagliardo, P 2019, 'REE-, Sr-, Ca-aluminum-phosphate-sulfate minerals of the alunite supergroup and their role as hosts for radionuclides' American Mineralogist, vol. 104, no. 12, pp. 1806-1819. https://doi.org/10.2138/am-2019-7116

REE-, Sr-, Ca-aluminum-phosphate-sulfate minerals of the alunite supergroup and their role as hosts for radionuclides. / Owen, Nicholas D.; Cook, Nigel J.; Rollog, Mark; Ehrig, Kathy J.; Schmandt, Danielle S.; Ram, Rahul; Brugger, Joël; Ciobanu, Cristiana L.; Wade, Benjamin; Guagliardo, Paul.

In: American Mineralogist, Vol. 104, No. 12, 18.12.2019, p. 1806-1819.

Research output: Contribution to journalArticle

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T1 - REE-, Sr-, Ca-aluminum-phosphate-sulfate minerals of the alunite supergroup and their role as hosts for radionuclides

AU - Owen, Nicholas D.

AU - Cook, Nigel J.

AU - Rollog, Mark

AU - Ehrig, Kathy J.

AU - Schmandt, Danielle S.

AU - Ram, Rahul

AU - Brugger, Joël

AU - Ciobanu, Cristiana L.

AU - Wade, Benjamin

AU - Guagliardo, Paul

PY - 2019/12/18

Y1 - 2019/12/18

N2 - Aluminum-phosphate-sulfate (APS) minerals of the alunite supergroup are minor components of uranium-bearing copper ores from the Olympic Dam deposit, South Australia. They typically represent a family of paragenetically late replacement phases after pre-existing REE-bearing phosphates (fluorapatite, monazite, and xenotime). Characterization with respect to textures and composition allows two groups to be distinguished: Ca-Sr-dominant APS minerals that fall within the woodhouseite and svanbergite compositional fields; and a second REE- and phosphate-dominant group closer to florencite in composition. All phases nevertheless display extensive solid solution among end-members in the broader APS clan and show extensive compositional zoning at the grain-scale. Samples representative of the deposit (flotation concentrate and tailings), as well as those that have been chemically altered during the processing cycle (acid leached concentrate), were studied for comparison. NanoSIMS isotope mapping provides evidence that the APS minerals preferentially scavenge and incorporate daughter radionuclides of the 238U decay chain, notably 226Ra and 210Pb, both over geological time within the deposit and during ore processing. These data highlight the role played by minor phases as hosts for geologically mobile deleterious components in ores as well as during mineral processing. Moreover, Sr-Ca-dominant APS minerals exhibit preferential sorption of Pb from fluid sources, in the form of both common Pb and 210Pb, for the first time revealing potential pathways for 210Pb elimination and reduction from ore processing streams.

AB - Aluminum-phosphate-sulfate (APS) minerals of the alunite supergroup are minor components of uranium-bearing copper ores from the Olympic Dam deposit, South Australia. They typically represent a family of paragenetically late replacement phases after pre-existing REE-bearing phosphates (fluorapatite, monazite, and xenotime). Characterization with respect to textures and composition allows two groups to be distinguished: Ca-Sr-dominant APS minerals that fall within the woodhouseite and svanbergite compositional fields; and a second REE- and phosphate-dominant group closer to florencite in composition. All phases nevertheless display extensive solid solution among end-members in the broader APS clan and show extensive compositional zoning at the grain-scale. Samples representative of the deposit (flotation concentrate and tailings), as well as those that have been chemically altered during the processing cycle (acid leached concentrate), were studied for comparison. NanoSIMS isotope mapping provides evidence that the APS minerals preferentially scavenge and incorporate daughter radionuclides of the 238U decay chain, notably 226Ra and 210Pb, both over geological time within the deposit and during ore processing. These data highlight the role played by minor phases as hosts for geologically mobile deleterious components in ores as well as during mineral processing. Moreover, Sr-Ca-dominant APS minerals exhibit preferential sorption of Pb from fluid sources, in the form of both common Pb and 210Pb, for the first time revealing potential pathways for 210Pb elimination and reduction from ore processing streams.

KW - U decay series radionuclides

KW - aluminum-phosphate-sulfates

KW - Alunite supergroup

KW - mineral processing

KW - Olympic Dam

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