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Rare earth element study on scheelites from tungsten deposits in southwest of Astaneh, Arak, Iran M. Ghaderi 1 , Z. Fardindoost 1 , J. Herrin 2 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 REE N 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 +REE contents. The samples are enriched in HREE. Bamsar type REE N pattern has lower +REE 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 +REE 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) Downloaded from ijcm.ir at 21:00 +0430 on Thursday June 17th 2021
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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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    [2] Mohajjel M., Fergusson C. L., Sahandi M. R., "Cretaceous-Tertiary convergence and continental collision, Sanandaj-Sirjan zone, western Iran",Journal of Asian Earth Sciences 21 (2003) 397- 412.

    ]j[z ?���.�"��� ���� D�" .�&= $ .��)�5 .�E�� D��M&)���= D����� D&*$), $ �����).t�$ ��$�W� ��7:7mmmmm ����� ("�����, ����q��� �%&q!' ��(�q��� ��q��� �q������/ .q���

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    [6] Berthier F., Billiault J. P., Halbronn B., Maurizot P., "Field works in the frame of Khorramabad quadrangle map", Geological Survey of Iran (1992).

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    [10] Longerich H. P., Jackson S. E., Günther D., "Laser ablation inductively coupled mass spectrometry transient signal data acquisition and analyte concentration calculation", Journal of Analytical Atomic Spectrometry 11 (1996) 899-904. [11] Sun S. S., McDonough W. F., "Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In Saunders A. D. and Norry M. J. (eds.) Magmatism in the ocean basins",Spec. Publ. Vol. Geol. Soc. Lond., No. 42 (1989) 313-345. [12] Ghaderi M., Palin J. M., Campbell I. H., Sylvester P. J., "Rare earth element systematics in scheelite from hydrothermal gold deposits in the Kalgoorlie-Norseman region, Western Australia", Economic Geology 94 (1999) 423-437.

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    [13] Sverjensky D. A., "Europium redox equilibria in aqueous solution",Earth and Planetary Science Letters 67 (1984) 70-78.

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    [15] Giuliani G., Cheilletz A., Mechiche M., "Behaviour of REE during thermal metamorphism and hydrothermal infiltration associated with skarn and vein type tungsten ore bodies in Central Morocco", Chemical Geology 64 (1987) 279-294. [16] Mason B.H., Moore C. B., Principles of geochemistry. John-Wiley & Sons Ltd. (1982). [17] Bau M., "Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and the significance of the oxidation state of europium", Chemical Geology 93 (1991) 219-230.

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