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Minerals of the rhabdophane group and the alunite supergroup in microgranite: products of low-temperature alteration in a highly acidic environment from the Velence Hills, Hungary

Published online by Cambridge University Press:  02 July 2018

Martin Ondrejka ,
Peter Bačík ,
Tomáš Sobocký ,
Pavel Uher ,
Radek Škoda ,
Tomáš Mikuš ,
Jarmila Luptáková  and
Patrik Konečný
Martin Ondrejka*
Affiliation:
Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
Peter Bačík
Affiliation:
Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
Tomáš Sobocký
Affiliation:
Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
Pavel Uher
Affiliation:
Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina, Ilkovičova 6, 842 15, Bratislava, Slovakia
Radek Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Tomáš Mikuš
Affiliation:
Earth Science Institute of the Slovak Academy of Sciences, Ďumbierska 1, 974 01, Banská Bystrica, Slovakia
Jarmila Luptáková
Affiliation:
Earth Science Institute of the Slovak Academy of Sciences, Ďumbierska 1, 974 01, Banská Bystrica, Slovakia
Patrik Konečný
Affiliation:
Geological Survey of Slovak Republic, Mlynská dolina 1, 817 04 Bratislava, Slovakia
*
*E-mail:martin.ondrejka@uniba.sk
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Abstract

An assemblage of alunite-supergroup minerals (ASM), rhabdophane-group minerals (RGM), goethite and associated clay minerals occurs in Permian A-type porphyritic microgranite in the eastern part of the Velence Hills, Hungary. The secondary sulfates/phosphates include jarosite, Pb-rich jarosite and alunite, corkite, hinsdalite and rhabdophane-(Ce), -(La) and -(Nd). Detailed electron probe microanalysis and Raman spectroscopy reveal a wide miscibility among RGM end-members and show a rhabdophane–tristramite–brockite solid solution with extensive compositional variation. Moreover, ASM show heterogeneous composition and complex substitution mechanisms within the alunite, beudantite and plumbogummite groups. The formation of this rare mineral assemblage reveals extensive remobilization of rare-earth elements (REE), Th, U, P, S, Fe and Pb under supergene conditions. Compositional variations and substitution trends of the RGM investigated indicate that Th, U, Ca and Pb are incorporated into the rhabdophane structure by a (Ca, Pb)2+ + (Th, U)4+ ↔ 2REE3+ substitution mechanism. Consequently, we suggest the following end-member formulae for RGM containing divalent and tetravalent cations: (Ca0.5Th0.5)PO4·H2O for brockite, (Pb0.5Th0.5)PO4·H2O for grayite and (Ca0.5U0.5)PO4·2H2O for tristramite. The ASM and RGM originated from total leaching of the primary magmatic REE, Th, U and P minerals in the microgranite [most probably allanite-(Ce), fluorapatite and possibly also xenotime-(Y)], together with input of Pb and S in low-temperature, acid sulfate solutions, connected with an adjacent Palaeogene andesite–diorite intrusion and the accompanying hydrothermal sulfide mineralization.

Keywords

rhabdophane groupalunite supergroupjarositealunitecorkitehinsdalitesupergene alterationmicrograniteVelenceHungary

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Mineralogical Magazine , Volume 82 , Issue 6 , December 2018 , pp. 1277 - 1300
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Michael Rumsey

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