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 99
- Downloads 0
Accumulation and vertical distribution of heavy metals in sapropel of Gryaznoe Lake (Medvezh'egorsk district, Republic of Karelia)
The results of studying sapropel sediments and clay underlying sapropel of Gryaznoe Lake (the Medvezh'egorsk district, Republic of Karelia) have been considered. Analysis of the small stock published literature and fund...
Viability of the culture of Bifidobacterium bifidum immobilized by microencapsulation in dairy drink and the simulated gastrointestinal liquids
The existing technologies of the enriched dairy drinks assume enrichment of a product by live microorganisms, so-called probiotics, generally lactobacilli and bifidobacteria. However, the viability of probiotics and qual...
Antioxidant complex extracts from fucus algae of the Barents Sea
A new method for obtaining antioxidant complex extracts from fucus algae has been proposed at the example of three mass species of the Barents Sea: Fucus vesiculosus, Fucus serratus and Fucus distichus. The chemical comp...
The first find of diamond on the Sredny and Rybachy Peninsulas in the north-eastern Baltic Shield
The regular features of the region's spatial-temporal evolution have been discussed. Based on geodynamic analysis and the time scale of the crust formation in the eastern Baltic Shield, it is defined, that the most promi...
Chinese mitten crab Eriocheir sinensis domesticates a new habitat
The fact of habitation of an invading species – the Chinese mitten crab Eriocheir sinensis – in the Lakhtinskaya Bay of Lake Onega has been registered. It should be mentioned that the first specimens were caught near the...