Late Paleozoic stages of ore formation in the Middle Tien Shan: isotopic U-Pb zircon dating (LA-ICP-MS method) of intrusive rocks from the Sonkul and Kokturpak plutons (eastern Kyrgyzstan)

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The paper presents the isotopic U-Pb study data (LA-ICP-MS method) of zircon from intrusive rocks of the Sonkul and Kokturpak plutons situated along the deep-seated fault system of the “Nikolaev Line” in the eastern Kyrgyzstan. These plutons of high-potassic rocks are spatially and genetically associated with the Kumbel and Kashkasu W-Mo-Cu-Au deposits, respectively, as well as other occurrences of W and W-Au mineralization. Together with other Au, W and Cu deposits, they are parts of the extended metallogenic belt of Tien Shan. The concordant isotopic U-Pb ages of zircon autocrysts for the consecutive intrusive phases span over the interval of approximately 303 to 283 Ma. This interval included the crystallization of olivine gabbro (299±2 Ma) in the Sonkul pluton, monzonite (300±3 Ma) in the Kokturpak pluton, granodiorite of the main intrusive phase (299±3 Ma in the Sonkul pluton and 297±4 Ma in the Kokturpak pluton), and monzogranite (289±4 Ma in the Sonkul pluton and 285±2 Ma in the Kokturpak pluton). Zircon antecrysts dated at 306–311 (to 323?) Ma have also been distinguished. The age data obtained correspond to the pluton emplacement in the Late Carboniferous-Early Permian initially in subduction-related and then post-collisional tectonic settings. Besides, in the Middle Tien Shan, this age interval corresponds to one of the regional pulses of high-potassic calc-alkaline and shoshonitic magmatism. A distinct metallogenic evolution corresponds to these pulses that is expressed in the change from porphyry Cu-Au-Mo deposits related to the early pulse to essentially tungsten (W-Mo-Cu-Au) and then essentially gold deposits related to younger pulses. The rocks also contain zircon xenocrysts with ancient age (in the order of 1.5–2.5 Ga) that probably represent the age of the Tarim craton basement.

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Sobre autores

S. Soloviev

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

Autor responsável pela correspondência
Email: serguei07@mail.ru
Rússia, Moscow

S. Kryazhev

Central Research Institute of Geological Prospecting for Base and Precious Metals

Email: serguei07@mail.ru
Rússia, Moscow

D. Semenova

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

Email: serguei07@mail.ru
Rússia, Novosibirsk

Y. Kalinin

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

Email: serguei07@mail.ru
Rússia, Novosibirsk

N. Bortnikov

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

Email: serguei07@mail.ru

Academician of the RAS

Rússia, Moscow

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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 possible cratonic basement, 5 - major (a) and minor (b) gold deposits, 6 - gold-copper-molybdenum-tungsten deposits, 7 - molybdenum-tungsten deposits, 8 - polymetal-tungsten deposits, 9 - tin-tungsten deposits, 10 - tin deposits, 11 - major (a) and minor (b) copper-molybdenum and molybdenum-gold-copper porphyry deposits, 12 - state borders.

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3. Fig. 2. Geological schemes (A) of Eastern Kyrgyzstan, showing the position of the “V.A. Nikolaev line” and the structure of adjacent territories, (B) the area of ​​the Sonkul and Kokturpak plutons, and (C) the eastern flank of the Sonkul pluton, with the position of the Kumbel deposit and its cross-section (according to data from [5, 6). A: 1 – Cenozoic deposits, 2 – Late Devonian-Early Carboniferous suture troughs (Sonkul, Turuk), 3 – terranes of the Southern Tien Shan, 4 – terranes of the Middle Tien Shan, 5 – terranes of the Northern Tien Shan, 6 – Paleoproterozoic (up to Archean?) gneisses, amphibolites, migmatites (blocks of the base of the Tarim Craton, separated by rift systems), 7 – Late Carboniferous-Early Permian intrusions of the shoshonite and high-potassium calc-alkaline series, 8 – individual Late Carboniferous-Permian granitoid intrusions of the Southern Tien Shan, 9 – faults, 10–12 – deposits and ore occurrences (10 – gold, 11 – tungsten, 12 – molybdenum). B: 1 – Neogene-Quaternary conglomerates, sandstones, siltstones, sands, gypsums, 2–5 – Late Carboniferous-Early Permian intrusive rocks of the Sonkul and Kokturpak plutons (2 – monzogranites, 3 – granodiorites, 4 – monzonites to quartz monzonites of the Ichkesu stock, 5 – olivine gabbros, monzodiorites and monzonites), 6 – faults, 7–9 – deposits and ore occurrences (7 – tungsten, 8 – gold, 9 – magnetite), 10 – sampling locations for isotope dating of zircons. B: 1–4 – Late Carboniferous-Early Permian intrusive rocks of the Sonkul pluton and Ichkesu stock (1 – monzogranites, 3 – granodiorites, 4 – monzonites to quartz monzonites of the Ichkesu stock, 5 – monzodiorites to monzonites), 5–7 – Lower Carboniferous sedimentary rocks (5 – siltstones (a), calcareous sandstones and conglomerates (b), 6 – sandy dolomitic limestones, 7 – thin-banded beds of alternating siltstones and sandstones, with partial skarnification), 8 – faults, 9 – skarns, 10 – zones of sericite-carbonate-quartz metasomatites with rod-shaped quartz veins).

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4. Fig. 3. Cathodoluminescence images of zircon crystals (circles indicate points where isotopic dating was carried out, point numbers correspond to those in Table 2) and concordia diagrams for zircons from intrusive rocks of the Sonkul pluton (thin solid ellipses are the results of single analyses, the dotted ellipse corresponds to the concordant value; errors of single analyses and calculated concordant ages are given at the 2σ level).

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5. Fig. 4. Cathodoluminescence images of zircon crystals (circles indicate points where isotopic dating was carried out, point numbers correspond to those in Table 2) and concordia diagrams for zircons from intrusive rocks of the Kokturpak pluton (thin solid ellipses are the results of single analyses, the dotted ellipse corresponds to the concordant value; errors of single analyses and calculated concordant ages are given at the 2σ level).

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