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Chemistry of the Ta-Nb-Sn-W oxide minerals from the Yichun rare metal granite (SE China): genetic implications and comparison with Moroccan and French Hercynian examples

Published online by Cambridge University Press:  05 July 2018

M. Belkasmi ,
M. Cuney ,
P. J. Pollard  and
A. Bastoul
M. Belkasmi
Affiliation:
Sidi Mohamed Ben Abdellah University, Department of Earth Sciences, BP. 1796, Fes-Atlas, Morocco
M. Cuney*
Affiliation:
CREGU-UMR G2R 7566, UHP, BP 239, F-54506, Vandú uvre Cedex, France
P. J. Pollard
Affiliation:
Economic Geology Research Unit, School of Earth Sciences, James Cook University, Townsville, Qld. 4811, Australia
A. Bastoul
Affiliation:
Ibn Tofail University, Department of Earth Sciences, BP 133, Kenitra, Morocco
*
* E-mail: [email protected]
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Abstract

In the Yichun granite complex (SE China), columbite group minerals, microlite and cassiterite are the main Nb, Ta, Sn-bearing minerals. They are mainly concentrated in the uppermost albite-lepidolite granite. Rutile is the only Nb, Ta-bearing phase in the geochemically primitive muscovite-zinnwaldite granite. The chemical evolution of the columbite group minerals (the most abundant and commonly zoned Nb, Ta-bearing minerals) indicates a complex crystallization history of the host granites with: (1) fractional crystallization at depth, reflected by a strong increase of Mn/(Mn+Fe) ratios with a moderate increase of Ta/(Ta+Nb) ratios from the muscovite-zinnwaldite granite to the Li-mica granite and then the most fractionated topaz-lepidolite granite; and (2) emplacement of successive magma batches corresponding to the different units of the granite complex with progressive crystallization of each unit, mainly reflected by a strong increase of Ta/(Ta+Nb) ratios with moderate variation of Mn/(Mn+Fe) ratios during the growth of the zoned crystals. The data are compared with those from the RMG of Ezzirari (Morocco), Montebras, Beauvoir and Chèdeville (France).

Keywords

YichunEz-ziraricolumbitetantalitemicrolitecassiteriteNbTa-rutilewolframitezoning
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 3 , June 2000 , pp. 507 - 523
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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