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DOI: 10.5593/sgem2017/11/S01.083

RARE-EARTH PYRIT CONCREES MINERALIZATION IN THE DEPOSITS OF TATARSTAN MIDDLEURISH AGE

E.A. Korolev, A.I. Bakhtin, A.A. Eskin, V.P. Morozov, E.R. Barieva
Saturday 9 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7105-98-8 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 11, 659-664 pp, DOI: 10.5593/sgem2017/11/S01.083

ABSTRACT

In the Oxford-Kimmeridgian deposits stages of the territory of western Tatarstan, it was discovered a field of stratiform pyrite mineralization. In this field clays are enriched by pyrite nodules. X-ray fluorescent and electron microscopic analyzes during the study of pyrite nodules revealed an increased content of rare-earth phosphates elements (monazites) in them. Monazites are mainly represented by LaPO4, CePO4, (La,Ce)PO4, (Nd,La)PO4 and SmPO4. They form single xenomorphic grains and short-prism crystals. Three generations of monazites are distinguished: the first are developed along the surface of inclusions of quartz and feldspars grains, the second replace the pyrite grains, the third are developed in the pores between the pyrites grains. We propose mechanisms of the monazites stages formation based on the geochemical phosphates properties of rare earth elements.

Keywords: Jurassic sediments, paleo-griffons, pyrite concretion, monazite

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