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Vol. 17 (2014 year), No. 2

N.M. Kudryashov, S.G. Skublov, A.V. Mokrushin, L.M. Lyalina
Mineralogical and geochemical characteristics of zircon from Archaean gabbro-anorthosites of the Kola region

Mineralogical and geochemical research of zircon from the gabbro-anorthosites of Tsaginski (2659 3 Ma) and Severny (2935 8 Ma) intrusions has been conducted. Study of the zircon morphology, its internal structure in the cathodoluminescence and backscattered electron, as well as studying the content and distribution of rare earth elements provided important information on the conditions of the zircon growth. Zircon from both intrusions has all the features of magmatic origin with similar REE patterns. The differences in the content of trace elements (Th, U, Ti) in zircons of the studied intrusions have been established, indicating the different conditions of zircon crystallization. Calculated zircon crystallization temperature in the Tsaginski intrusion is in the range of 673-714 °C, in the Severny intrusion – 730-813 °C.

(in Russian, стр.6, fig. 2, tables. 1, ref 10, Adobe PDF, Adobe PDF 0 Kb)