Russian Mineralogical Society
XI RMS General Meeting “Modern mineralogy: from theory to practice” combined with the Fedorov Session 2010
Compositional variation of columbite-tantalite and wodginite from the Ebelekan rare metal granite (Central Hoggar, Algeria)

RMS-DPI code:  2010-1-71-1
Scientific session:  M2. Minerals as indicators of ore- and rock formation.
Author listing:  Kesraoui M., Nedjari S.
Principal author:  Kesraoui Mokrane
Language:  English
Abstract - Summary 
(short description):
The Nb-Ta oxides minerals in the Ebelekan rare metal granite generally occur as small (100-400µm in size) subhedral tabular or prismatic inclusions within zinnwaldite, more rarely in K-feldspar, quartz or topaz, arguing for their magmatic origin. The crystals are heterogeneous and show evidence of an intergrowth of two phases: a columbite-tantalite core and a rimmed wodginite. The columbite-tantalite is patchily zoned and corroded whereas the wodginite exhibit a typical oscillatory growth-zoning with limits parallel to crystallographic planes. Partial resorption and replacement with more Ta-enriched phases represent a primary magmatic trend.
Date of presentation:  13/10/2010
Time of presentation:  12:40
Presentation Place:  Mining University, Hall 1160
RMS-DPI code:  2010-1-71-1
Proceeedings volume 
in the RMS catalogue:
Modern mineralogy: from theory to practice
Pages:  193-194
File of proceedings 
 257 K
Status:  printed
Accepted:  14/07/2010
Published on-line:  21/11/2010
Permanent address of publication:
Contact author(s):  Kesraoui, Mokrane

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