Leucogranite intrusions in Eastern Kazakhstan: age, composition and mechanisms of formation

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Abstract

There are several large intrusions composed of 70–75% leucogranites within Eastern Kazakhstan. Information on the age of the intrusions is provided, the features of the composition of the rocks are considered, and conclusions about the petrogenetic mechanisms of forming of leucogranite magmas are drawn. Two stages of leucogranite intrusive magmatism have been established – in the Early Permian and in the Early Triassic. Their formation occurred in an intraplate geodynamic setting. Leucogranite magmas were formed as a result of partial melting of crustal substrates under the thermal influence of mafic magmas. Geochemical differences in leucogranites were due to different compositions of crustal substrates and different degrees of their melting.

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About the authors

S. V. Khromykh

V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: serkhrom@igm.nsc.ru
Russian Federation, Novosibirsk

P. D. Kotler

V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: serkhrom@igm.nsc.ru
Russian Federation, Novosibirsk

N. N. Kruk

V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: serkhrom@igm.nsc.ru

Corresponding Member of the RAS

Russian Federation, Novosibirsk

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Supplementary files

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2. Fig. 1. The layout of leucogranite intrusions in Eastern Kazakhstan. It is based on the scheme of magmatic complexes of Eastern Kazakhstan [11]. 1 – sedimentary and volcanogenic formations (S–C), undifferentiated; 2 – basite-ultrabasite intrusions (C1, P1); 3 – continental basalts and andesites (C2-P1); 4 – granitoid intrusions (C1–2); 5 – granitoid intrusions (P1); 6 – leukogranite intrusions (P1, T1); 7 – swarms of basal dikes (C2-P1); 8 – faults; 9 – Quaternary deposits. The numbers in the circles are leucogranite intrusions, in the Kalba–Narym zone: 1 - Dungalinsky massif, 2 – Monastyrsky massif, 3 – Sibinsky massif, 4 – Voylochevsky massif; in the Charsky zone: 5 – Semeytau massif, 6 – Delbegetey massif; in the Zharma-Saur zone: 7 – Arkat massif, 8 – Karakoltas Massif, 9 – Kandygatai massif, 10 – Biesimas massif, 11 – Korgantas massif (off–scale), 12 – Keregetas Massif (off-scale), 13 - Upper Espe Massif (off-scale). The numbers in the rectangles are the age values of the leukogranites, determined by U–Pb dating using zircons. The inset shows the position of the structural and formation zones of the Ob-Zaisan folded system.

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3. 2. The composition of leucogranites of massifs of Eastern Kazakhstan in the classification diagrams: (a) – K2O–SiO2 [5]; (b) – MALI–SiO2, (c) – FeOtot/(FeOtot + MgO)–SiO2 [6]; (d) – ASI–SiO2 [7]; (e) – Qtz–Ab–Or [8]. K-N – leucogranites of the Kalba-Narym zone; H – leucogranites of the Charsky zone; H(E) – the Delbegetey massif; H(C) – the Semytau massif; W-C – leucogranites of the Zharma-Saur zone; W-C(W) – alkaline leucogranites of the Zharma-Saur zone.

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4. 3. The composition of leukogranites of East Kazakhstan massifs on discriminant diagrams: (a) – Rb–(Y+Nb), (b) – Nb–Y, (c) – Rb–(Ta+Yb), (d) – Ta–Yb [9]; (e) – (FeOtot/MgO)–(Zr+Nb+Ce+Y), (e) – (Na2O+K2O/CaO)–(Zr+Nb+Ce+Y) [10]. K-N – leucogranites of the Kalba-Narym zone; H – leucogranites of the Charsky zone; H(E) – the Delbegetey massif; H(C) – the Semytau massif; W-C – leucogranites of the Zharma-Saur zone; W-C(W) – alkaline leucogranites of the Zharma-Saur zone.

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5. 4. Isotopic characteristics of leucogranites of East Kazakhstan in the diagram “eNd(T) – age". K-N – leucogranites of the Kalba-Narym zone; H – leucogranites of the Charsky zone; W-C – leucogranites of the Zharma-Saur zone; W-C(W) – alkaline leucogranites of the Zharma-Saur zone.

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