New data on isotopic U-Pb age (LA-ICP-MS method) of zircon from intrusive rocks of the Kuru-Tegerek gold-copper-molybdenum skarn deposit (Middle Tien Shan, Kyrgyzstan)

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Abstract

The paper presents new isotopic U–Pb data (LA-ICP-MS) method of zircon from the main types of intrusive rocks at the Kuru-Tegerek gold-copper-molybdenum skarn deposit situated in the Chatkal segment of the Middle Tien Shan. This and other gold, copper, tungsten and molybdenum deposits are parts of the extended Late Paleozoic metallogenic belt of Tien Shan. The concordant isotopic U–Pb values obtained for zircon autocrysts from the rocks of sequential intrusive phases span over the interval from approximately 323 to 311 Ma. This interval comprises the crystallization of gabbro-diorite (from 323.5±2.5 Ma to 323.2±6.8 Ma) and tonalite (from 321.4±3.8 Ma to 311±3.8 Ma). The age dates obtained for these zircon autocrysts correspond to the emplacement of these moderate-potassic intrusions in the Late Carboniferous and are almost coincident with the isotopic dates previously known for the high-potassic intrusions of the porphyry Cu–Au–Mo deposits of the Almalyk mineralized cluster (Kurama segment of the Middle Tien Shan), which were also emplaced in the Late Carboniferous (about 330–310 Ma). This corresponds to the subduction tectonic regime occurred in this region in relation to the steep-dipping (in the Kurama segment) or flat (in the Chatkal segment) subduction of a tectonic plate toward the north, under the structures of the Kazakhstan-Northern Tien Shan continental massif and accreted segments of the Middle Tien Shan. The intrusive rocks studied at the Kuru-Tegerek deposit contain also zircon xenocrysts (including these in the core of complex crystals) with the isotopic U–Pb age of some 1.9–2.1 Gb. These dates are in agreement with the age of metamorphic rocks in the Tarim craton basement and indicate the presence of the ancient continental crust in this segment of the Middle Tien Shan.

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About the authors

S. G. Soloviev

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Author for correspondence.
Email: serguei07@mail.ru
Russian Federation, Moscow

S. G. Kryazhev

Central Research Institute of Geological Prospecting for Base and Precious Metals

Email: serguei07@mail.ru
Russian Federation, Moscow

D. V. Semenova

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

Email: serguei07@mail.ru
Russian Federation, Novosibirsk

Y. A. Kalinin

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

Email: serguei07@mail.ru
Russian Federation, Novosibirsk

N. S. Bortnikov

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

Email: serguei07@mail.ru

Academician of the RAS

Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Scheme of the late Paleozoic metallogenic belt of Tien Shan. 1 – faults of different orders, 2 – late Paleozoic active continental margin (Middle Tien Shan), 3 – continental blocks of the basement of the Tarim and Karakum cratons, 4 – accretionary wedge terranes thrust onto the passive continental margin with economic cratonic basement, 5 – main (a) and secondary (b) gold deposits, 6 – gold-copper-molybdenum-tungsten deposits, 7 – molybdenum-tungsten deposits, 8 – polymetallic-tungsten deposits, 9 – tin-tungsten deposits, 10 – tin deposits, 11 – main (a) and secondary (b) copper-molybdenum and gold-copper porphyry deposits, 12 – boundary signs.

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3. Fig. 2. Geological schemes of the Chatkal and Kuramin segmental Middle Tien Shan (A) and the Kuru-Tegerek deposit (B) (according to data from [8, 10, 12]). A: 1 - Permian granitoids, 2 - Late Carboniferous granitoids (Sandalash complex in the Chatkal segment), 3 - Early-Late Carboniferous granitoids, 4 - exclusively acidic Carboniferous-Permian volcanics, 5 - exclusively basic Carboniferous-Permian volcanics and coal-bearing molasses, 6 - Devonian-Carboniferous limestones, dolomites, conglomerates, sandstones, 7 - Silurian and older carbonate and siliceous rocks, 8 - faults, 9 - gold deposits, 10 - copper-gold deposits, 11 - epithermal silver-gold deposits, 12 - molybdenum-gold-copper-porphyry deposit, 13 - skarn molybdenum-tungsten deposits, 14 - polymetallic (Pb-Zn, Ag-U-Co-Ni-As and other) deposits. B: 1 – Cenozoic deposits, 2 – Lower Stone dolomites and limestones, 3 – tonalites, 4 – gabbro-diorites, 5 – skarns, 6 – ore bodies, 7 – zones of carbonate-philisite metasomatites, 8 – sampling location for isotope dating of zircons.

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4. Fig. 3. Cathodoluminescent crystal images of zircon (the circles are marked with points where isotopic dating was carried out, the point numbers correspond to those in Table 2) and concordia diagrams for zircons from the rock of the intrusive stock of the Kuru-Tegerek deposit (thin solid ellipses are the results of single analyses, the dashed ellipse corresponds). The errors of single analyses and calculated concordant ages are given at the 2σ level (according to the concordant result). A – concordia diagram taking into account the age of zircon autocrysts and xenocrysts. B-F – sections of the concordia diagram for zircon autocrysts.

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