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- Title
Neoproterozoic Rare-Metal Subalkali Leucogranite from the Northern Yenisei Ridge.
- Authors
Nozhkin, A. D.; Reverdatto, V. V.
- Abstract
Petrochemical study and U-Pb SIMS (SHRIMP-II) zircon analyses of subalkaline leucogranite of the Khariusikha Massif have been carried out. They have revealed for the first time a rare-metal mineralization. The elevated concentrations of rare elements (wt %) are Nb (0.5-0.7), Ta (0.12-0.16), REEs (0.08-0.24), Y (0.06-0, 1), Zr (2.3-2.6), Hf (0.1-0.12), U (0.05-0.1), and Th (0.08-0.1) and are confined to albitized granites. The main mineral phases concentrating the rare elements, U and Th, are tantalo-niobates: fergusonite, euxenite, U-pyrochlore, tantalite, as well as thorite, monazite, zircon, and sphene. These minerals associate with cassiterite, sulfides, and gold. The simultaneity of the intraplate granitoid magmatism (753 ± 4 Ma) and bimodal rhyolite-basalt volcanism (753 ± 6 Ma) in the neighboring rift structure has been demonstrated. Presumably, the Neoproterozoic rifting and intraplate magmatism relate to the plume activity that caused the supercontinent Rodinia to break up.
- Subjects
YENISEY Ridge (Russia); PETROLEUM chemicals; NONFERROUS metals; ALKALINE solutions; MINERALIZATION; GEOLOGIC faults
- Publication
Doklady Earth Sciences, 2018, Vol 480, Issue 1, p580
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X18050276