Age and Formation Conditions of U Mineralization in the Litsa Area and the Salla-Kuolajarvi Zone (Kola Region, Russia)

Abstract

The Kola region (NE of Fennoscandian Shield) has high uranium potential. The most promising structures within the Kola region in respect to uranium enrichment are the Litsa area and the Salla-Kuolajarvi zone. The principal objective of the present study was to define sequence and timing of uranium deposition within these areas. Isotopic (U-Pb and Rb-Sr) exploration of the rocks from Skal’noe and Dikoe U occurrences of the Litsa area and Ozernoe occurrences of the Salla-Kuolajarvi zone was carried out. As it follows from isotopic dating, the principal stages of uranium mineralization had taken place 2.3–2.2, 1.75–1.65, and 0.40–0.38 Ga ago, simultaneously with the stages of alkaline magmatism in the Kola region, which provided the uranium input. Uranium mineralization was related to hydrothermal and metasomatic events under medium to low temperature of ~550 °С at 2.3 Ga to ~280 °С at 0.4 Ga.

Composition and Structure of Zircon from Hydrothermal Uranium Occurrences of the Litsa Ore Area (Kola Region, Russia)

“…The Skal'noe and Dikoe sites are the largest ore occurrences with the 2.6-2.3 Ga REE-Th-U mineralization [32]. The rocks within the sites are represented by migmatized biotite, garnet-biotite and two-mica gneisses of the Kola Group more strongly deformed in the Dikoe area, and plagiogranites intercalated with amphibole gneisses, amphibolite bodies, and cross-cutting gabbro-dolerite dykes.…”

Гальгенбергит-(Се) Из Щелочных Пород Кондёрского Массива (Хабаровский Край)

“…Морфология и минеральная ассоциация гальгенбергита-(Се) указывают на его принадлежность к поздним этапам формирования пород. Это подтверждает выводы, полученные в предшествующих нашему исследованиях (Hollerer, 1998;Lindh, 2012;Сomin-Chiaramonti et al, 2016;Kaulina et al, 2018). При этом источником вещества для формирования исследуемого карбоната, вероятно, послужило разрушение гидратированного карбонатсодержащего аналога манганоэвдиалита под воздействием низкотемпературных гидротермальных растворов.…”

“…Кроме того, гальгенбергит-(Се) был обнаружен в Швеции (провинция Даларна) в гранитах I-типа массива Сёрвик (Lindh, 2012), в Парагвае (провинция Альто-Парагвай, щелочной комплекс Серро Боггиани) в составе нефелинового сиенита (Сomin-Chiaramonti et al, 2016) и в Австралии (провинция Элерон) на месторождении Ноланс-Бор в составе фторапатитовых жильных тел, секущих вмещающие гранитогнейсы (Huston et al, 2016). На территории России гальгенбергит-(Се) обнаружен на Кольском полуострове (северо-западный фланг Лицко-Арагубского комплекса) в пег-матоидных гранитах REE-Th-U -проявления Дикое (Kaulina et al, 2018) и на Южном Урале в составе сульфидных руд Талганского Cu-Zn месторождения (Ayupova et. al., 2019).…”

Elastic Anisotropy and Internal Structure of Rocks from the Uranium Ore Occurrences of the Litsa Ore Area (Kola Region, Russia)

“…Dikoe ore occurrence is located ≈ 20 km to the northeast from the Beregovoe ore occurrence at the intersection of the Litsa-Araguba and Titovka-Uraguba tectonic zones (Figure 1). Two types of ore-bearing rocks with uranium mineralization have been distinguised in this area: pegmatoid vein granitoids and quartz-feldspathic metasomatites [18,19]. The principal difference between these sites (for the purposes of our study) is that on the site Dikoe rocks with uranium mineralization are exposed at the surface.…”

“…Rocks and ores from the Beregovoe and Dikoe areas ( Figure 1) of the Litsa uranium ore zone were chosen to be an object of this study. Within the Litsa area, there were more than 30 uranium hydrothermal ore occurrences found, whose localization is controlled by fault and shear zones [18,19], which makes it a perfect test ground for the study.…”