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  • MINMAG_S_19_00064

    Rights statement: https://www.cambridge.org/core/journals/mineralogical-magazine/article/occurrence-of-wakefieldite-a-rare-earth-element-vanadate-in-the-rhyolitic-joe-lott-tuff-utah-usa/227B7FFBA9E68B85D426B713372D3BC1

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The occurrence of wakefieldite, a rare earth element vanadate, in the rhyolitic Joe Lott Tuff, Utah, USA

Research output: Contribution to journalJournal article

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  • B. Bagiński
  • R. MacDonald
  • H.E. Belkin
  • J. Kotowski
  • P. Jokubauskas
  • B. Marciniak-Maliszewska
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<mark>Journal publication date</mark>1/02/2020
<mark>Journal</mark>Mineralogical Magazine
Issue number1
Volume84
Number of pages8
Pages (from-to)109-116
Publication StatusPublished
Early online date14/10/19
<mark>Original language</mark>English

Abstract

The high-silica rhyolitic Joe Lott Tuff was erupted at 19.2 ± 0.4 Ma from the Mount Belknap caldera, SW Utah. Certain units in the tuff contain two species of wakefieldite, the Nd- A nd Y-dominant types. They occur in disseminated streaks and patches in association with rhodochrosite, calcite, Fe oxide, cerite-(Ce), and a Mn silicate (caryopilite?), thought to have been deposited from hydrothermal fluids. The wakefieldites contain the highest levels of As (≤15.34 wt.% As2O5) and P (≤5.7 wt.% P2O5) yet recorded in this mineral, indicating significant solid solution towards chernovite-(Y) and xenotime-(Y). Thorium levels are also unusually high (≤14.2 wt.% ThO2). The source of the hydrothermal fluid(s) is unknown but might be related to uranium mineralisation in the region, in that As, V and U are commonly associated in such deposits. © 2019 Mineralogical Society of Great Britain and Ireland.