Nanostructure reveals REE mineral crystallization mechanisms in granites from a heavy REE deposit, South China
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F41601670%3A_____%2F22%3AN0000005" target="_blank" >RIV/41601670:_____/22:N0000005 - isvavai.cz</a>
Result on the web
<a href="https://pubs.geoscienceworld.org/msa/ammin/article-abstract/107/12/2261/619048/Nanostructure-reveals-REE-mineral-crystallization" target="_blank" >https://pubs.geoscienceworld.org/msa/ammin/article-abstract/107/12/2261/619048/Nanostructure-reveals-REE-mineral-crystallization</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2138/am-2022-8309" target="_blank" >10.2138/am-2022-8309</a>
Alternative languages
Result language
angličtina
Original language name
Nanostructure reveals REE mineral crystallization mechanisms in granites from a heavy REE deposit, South China
Original language description
Weathering crusts after granites are the most important source of heavy rare-earth elements (HREE) worldwide. Although HREE in these deposits is known to be inherited from parental rocks, the origin of HREE enrichment and the reasons why it is rare outside of China remains unclear. Here, we report the occurrence of variably organized nanoparticles of Ce-poor (<0.2 wt%), Nd-Y-rich bastnäsite-(La), and associated cerianite in parental granites from a HREE deposit, South China. The mineral contains high-HREE abundances (up to 13 wt% Y2O3). Synchrotron radiation-induced X-ray diffraction and high-resolution transmission electron microscopy analyses suggest that the mineral grew as disordered nanocrystals and (nearly) coaligned nanoparticle aggregations, thus supporting “nonclassical” crystallization mechanisms by particle attachment under hydrothermal conditions. The nanocrystal-line Ce-poor, Nd-Y-rich bastnäsite-(La) precipitated at rapidly decreasing temperature related to the influx of externally derived fluids, which caused CO2-H2O immiscibility and REE supersaturation. This interpretation is supported by petrographic data and microthermometric analysis of fluid inclusions in quartz. Unusually high fO2 resulted in Ce oxidation and decoupling from trivalent lanthanides, producing polycrystalline mineralization.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GX19-29124X" target="_blank" >GX19-29124X: EVOLUTION AND POST-EMPLACEMENT HISTORY OF CARBONATITES: IMPLICATIONS FOR THE MOBILITY AND CONCENTRATION OF CRITICAL METALS</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
American Mineralogist
ISSN
0003-004X
e-ISSN
1945-3027
Volume of the periodical
107
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
2261–2271
UT code for WoS article
000915448800013
EID of the result in the Scopus database
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