Sequence of REE-Th-U minerals in the Litsa uranium ore area (the Kola Region)
Journal Title: Вестник МГТУ - Year 2019, Vol 22, Issue 1
Abstract
Mineralogical and petrographic study of REE-Th-U mineralization in rocks of the Litsa uranium ore area has been carried out to detail the sequence of formation of rare-earth, uranium and thorium minerals in rocks. The study has been aimed to Dikoe ore occurrence with the earliest in the area REE-Th-U mineralization described by previous workers. Rocks and minerals have been studied by means of optical and electron microscopy, as well as microprobe methods, this has made it possible to identify the relationship of minerals and the sequence of their crystallization. In monzodiorite veins and host biotite gneisses are found accessory minerals represented by monazite-(Ce), uraninite, zircon, apatite, and thorite, which are in close association with each other, but are formed at different stages of formation and transformation of the host rocks. Monazite-(Ce) with high thorium content (9–10 %) in association with apatite grows at the magmatic stage of monzodiorite crystallization both in the veins themselves and after the fine-grained mass of minerals in the biotite plates of the host gneisses. Magmatic zircon with elevated content of thorium and uranium crystallizes in veins together with monazite and apatite. The formation of uraninite, containing impurities of sulfur, yttrium and calcium, and associated with areas of granulation of plagioclase, occurs as a result of hydrothermal-metasomatic processes in veins simultaneously with the formation of textureless zircon rims with high calcium, iron, and hafnium content in the host gneisses. The development of galgenbergite and anglesite rims around uraninite grains reflects the next superimposed hydrothermal processes.
Authors and Affiliations
T. V. Kaulina, L. M. Lialina, V. L. Il'chenko
Keywords
Related Articles
- EP ID EP514178
- DOI 10.21443/1560-9278-2019-22-1-12-22
- Views 111
- Downloads 0
Long-term fluctuations in population of Semibalanus balanoides (L.) (Crustacea) in the estuarine zone of the Kola Bay
The intertidal population of the barnacles Semibalanus balanoides has been explored in the estuarine zone of the Tuloma River at the end of the Kola Bay for the first time. Barnacles S. balanoides are typical species for...
Magnetic separation of titanium-containing minerals
The studies have been carried out on the Afrikanda (the Murmansk region) titanium-containing minerals segregation by magnetic separation. The technological scheme of ore preparation and further enrichment is developed ta...
Lakes hydrochemistry in the zone of influence of iron-mining industry waste waters
To assess the current ecological state, a study has been conducted on the chemical composition of the lakes' waters which to varying degrees are influenced by the effluents of Olkon JSC (the town of Olenegorsk, the Murma...
On the background values of heavy metal content in bottom sediments of the Barents Sea
Based on the long-term data the background content in the number of heavy metals in bottom sediments of the Barents Sea has been estimated. For the purpose to estimate the up-to-date state of the geochemical background t...
The inclusion of grothite in the zircon from granitoids of the crystalline basement of the Southern Yamal Peninsula
Grothite – rare F-Al-rich type of titanite – has been found in accessory zircon from the granitoids of the pre-Jurassic basement of the Verkhnerechensky oil-gas area (in the southern part of the Yamal Peninsula) as a res...