Age of ore-bearing skarns of the Gavasai magnetite deposit (Kyrgyzstan): results of U‒Pb (ID-TIMS) geochronological studies of garnet

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Abstract

The results of U-Pb (ID-TIMS) geochronological studies of garnet from skarn rocks of the Gavasai magnetite deposit (Gava-Sumsar ore region, Kyrgyzstan) are presented. The data obtained on the age of the manifestation of contact-reaction processes (304±1 Ma) are consistent with the stage of the formation of gold and copper-gold mineralization in this area. This gives reason to assume the presence of rich deposits of other ore specialization within the distribution of iron ore deposits.

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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

Y. D. Gritsenko

Moscow State University; A. Fersman Mineralogical Museum, Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru

Geological Department

Russian Federation, Moscow; Moscow

References

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2. Fig. 1. The tectonic zoning scheme of the Tien Shan [2] and the location of some dated granitoid massifs ([3] and references in the work): 1 – The Middle Tien Shan, 2 – the Southern Tien Shan, 3 - the Northern Tien Shan, 4 – cratons, 5 – tectonic faults, 6 – state borders, 7 – gold deposits, 8 – Cu–Mo- and Cu–Au-porphyry deposits, 9 – Fe- and Fe–Cu-skarn deposits, 10 – Hawaiian deposit

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3. Fig. 2. Fragment of skarn rocks of the Hawaiian deposit (a); electron microscopic image of a fragment of a garnet crystal in the mode of secondary reflected electrons (b): Px – pyroxene, Pyr – pyrite; (c) Triangular diagram of garnet composition

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4. Fig. 3. A concordia diagram for garnet from the skarnov rocks of the Hawaiian ore field. The point numbers correspond to the ordinal numbers in Table 1.

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