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Two Stages of Mineralization in the Au–W Metallogenic Belt of Southern Tian Shan: Isotopic U–Pb Dating (LA-ICP-MS Method) of Zircon from Intrusive Rocks at the Jilau W–Au Deposit (Tajikistan)

  • GEOLOGY OF ORE DEPOSITS
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Abstract

The paper presents new isotopic U–Pb zircon data (LA-ICP-MS method) on the intrusive rocks from the Chinorsai massif, which is spatially and probably genetically related to the large Jilau tungsten-gold deposit. This deposit, together with the other large Au deposits (Muruntau, Zarmitan, Kumtor, etc.) is part of the largest Au (Au–W) metallogenic belt of Tien Shan. The deposit is represented by small zones of scheelitebearing skarn and later (overprinting) large stockwork of veins and veinlets with scheelite-gold mineralization that occurs within and near the intrusion. The concordant isotopic zircon U-Pb data (301.0 ± 2.6 Ma; MSWD = 2.6) are older than the isotopic zircon U–Pb data previously reported (about 288 Ma). This indicates a substantial extent of the magma emplacement and crystallization process that probably corresponded to several intrusive events or phases, which is a prerequisite for the formation of associated intrusive-related Au deposits. Also, the isotopic age determined highlights the earlier formation of gold-polymetallic-tungsten deposits as compared to Mo–W and Sn-W deposits in the region, which are related to the later Early Permian intrusions. In addition, zircon xenocrysts with much older age (from ca. 970 Ma to ca. 2200 Ma) have been identified; they probably represent the age of the orogenic basement including that of the basement terranes of the Tarim and Karakum cratons.

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ACKNOWLEDGMENTS

The authors are grateful to A.V. Tyshkevich, Central Research Institute of Geological Prospecting for Base and Precious Metals, Moscow, for processing and preparation of zircon samples.

Funding

This work was supported by the scientific programs of the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Moscow (project no. 121041500227-9), and the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    S. G. Soloviev &  N. S. Bortnikov

  2. Central Research Institute of Geological Prospecting for Base and Precious Metals, 117545, Moscow, Russia

    S. G. Kryazhev

  3. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    D. V. Semenova & Y. A. Kalinin

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  1. S. G. Soloviev
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  2. S. G. Kryazhev
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  3. D. V. Semenova
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  4. Y. A. Kalinin
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  5. N. S. Bortnikov
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Correspondence to S. G. Soloviev.

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Translated by V. Krutikova

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Soloviev, S.G., Kryazhev, S.G., Semenova, D.V. et al. Two Stages of Mineralization in the Au–W Metallogenic Belt of Southern Tian Shan: Isotopic U–Pb Dating (LA-ICP-MS Method) of Zircon from Intrusive Rocks at the Jilau W–Au Deposit (Tajikistan). Dokl. Earth Sc. 512, 938–945 (2023). https://doi.org/10.1134/S1028334X23601463

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