The first age data of the deposits of Kondomsky iron ore field (Gornaya Shoriya): results of U-Pb (ID-TIMS) dating of garnet

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Abstract

The results of U-Pb (ID-TIMS) geochronological studies of garnet from iron ore skarns of the Shalym deposit (Kondomskoye ore field, Gornaya Shoriya) are presented. The data obtained are the first estimate of the age of formation of the iron ore mineralization of the Kondomsky field (499 ± 1 MA). The formation of this deposit is associated with the stage of subalkaline magmatism of the Middle-Upper Cambrian age, which was not previously identified within the folded structures of the Mountain Shoria (the western part of the Altai-Sayan folded region).

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About the authors

M. V. Stifeeva

Institute of Precambrian Geology and Geochronology Russian Academy of Sciences

Author for correspondence.
Email: stifeeva.maria@yandex.ru
Russian Federation, Saint-Petersburg

E. B. Salnikova

Institute of Precambrian Geology and Geochronology Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru
Russian Federation, Saint-Petersburg

A. B. Kotov

Institute of Precambrian Geology and Geochronology Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru

Corresponding Member of the RAS

Russian Federation, Saint-Petersburg

Yu. D. Gritsenko

Lomonosov Moscow State University; A. Fersman Mineralogical Museum

Email: stifeeva.maria@yandex.ru

Geological Department

Russian Federation, Moscow; Moscow

References

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2. Fig. 1. Schematic map of volcanic belts and paleobasins of the western part of the Altai-Sayan folded region (compiled according to [2]); (b): 1 – volcanic belts with marginal sea and (or) oceanic associations; 2 – volcanic belts with island-arc associations; 3 – Vendian-Cambrian paleobasins; 4 – Early Paleozoic granitoid batholiths; 5 – Mesozoic-Cenozoic deposits; 6 – study area.

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3. Fig. 2. Image of the EDS map showing the distribution of Mg, Fe, Al and Ca in garnet from the Shalym deposit skarns.

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4. Fig. 3. Concordia diagram for garnet from ore-bearing skarns of the Shalym deposit. The numbers of points on the diagram correspond to the ordinal numbers in Table 1.

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