Y–REE-Rich zircons of the Timan region: Geochemistry and economic significance


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Abstract

Mineralogical–geochemical studies of zircon from the Ichet’yu occurrence revealed unusually high Y and HREE contents (correlative with the P content) in the inner parts and zones of approximately 10% of the grains. They represent the intermediate members of the zircon–xenotime join with a heterovalent scheme of isomorphism Zr4+ + Si4+ → (Y + HREE)3+ + P5+. Geochronological and mineralogical–geochemical data suggest that the Middle Timan basement (the most probable source of zircon of the Ichet’yu occurrence) is made up of the Paleoproterozoic rocks and possibly represents a continuation beneath the Mezen syneclise and Middle Timan of the Paleoproterozoic collisional structure, to which the Arkhangelsk diamond province is confined.

About the authors

A. B. Makeyev

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry

Author for correspondence.
Email: abmakeev@mail.ru
Russian Federation, Staromonetnyi per. 35, Moscow, 119017

S. G. Skublov

Institute of Precambrian Geology and Geochronology; Saint-Petersburg Mining University

Email: abmakeev@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034; St. Petersburg, 199106

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