TWO STAGES OF MINERALIZATION IN THE SOUTHERN TIEN SHAN Au-W METALLOGENIC BELT: ISOTOPIC U-Pb DATING (LA-ICP-MS METHOD) OF ZIRCON FROM INTRUSIVE ROCKS AT THE JILAU W-Au DEPOSIT (TAJIKISTAN)

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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 scheelite-bearing 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.

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, Moscow

S. G. Kryazhev

Central Research Institute of Geological Prospecting for Base and Precious Metals

Email: serguei07@mail.ru
Russian, Moscow

D. V. Semenova

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

Email: serguei07@mail.ru
Russian, Novosibirsk

Y. A. Kalinin

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

Email: serguei07@mail.ru
Russian, Novosibirsk

N. S. Bortnikov

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

Email: serguei07@mail.ru
Russian, Moscow

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Copyright (c) 2023 С.Г. Соловьев, С.Г. Кряжев, Д.В. Семенова, Ю.А. Калинин, Н.С. Бортников