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Rare earth element study on scheelites from tungsten deposits in
southwest of Astaneh, Arak, Iran
M. Ghaderi1, Z. Fardindoost1, J. Herrin2
1- Department of Geology, Tarbiat Modarres University, Tehran,
Iran 2- Faculty of Geosciences, Utrecht University, Utrecht, The
Netherlands
E-mail: [email protected]
Abstract: Two types of tungsten mineralization have been
recognized in southwest of Astaneh: 1. Stratabound type at Bamsar
with calcareous schists and siliceous tuffs as host rocks, 2.
Quartz-tourmaline vein type at Nezamabad, Revesht and Fizaneh
hosted in quartzdiorite-granodiorite intrusions. Scheelite is the
main tungsten ore mineral in both types. Generally, two distinct
REEN patterns are observed in the scheelites from the region:
Nezamabad, Revesht and Fizaneh patterns have a convex feature
varying from Eu-free to highly negative Eu anomaly, having high Na
and ΣREE contents. The samples are enriched in HREE. Bamsar type
REENpattern has lower ΣREE and Na, a relatively flat feature and
small to large positive Eu anomalies. The samples are enriched in
LREE. According to the REE trends, presence of high-temperature
minerals, exsolution textures, presence of organic and graphitic
parts, the two types of mineralization share a high temperature and
reducing environment, but some differences lie in REE controlling
processes. Surface absorption at Bamsar and mixing of complexes
mechanism at Nezamabad, Revesht and Fizaneh control the REE
patterns. Therefore, it can be concluded that the origin of REE in
scheelites in the mineralized areas of Bamsar, Nezamabad, Revesht
and Fizaneh share the same source and the differences in ΣREE
result from the influence of host rocks in the areas with vein-type
mineralization. Keywords: Rare earth elements, Scheelite,
Stratabound, Quartz-tourmaline vein, Arak, Iran.
Vol. 13, No. 1, 1384/2005 Spring & Summer
(Received: 1/6/2004, received in revised form: 15/1/2005)
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