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Two stages of mineralization in the Southern Tien Shan W-Au metallogenic belt: Isotopic U-Pb dating (LA-ICP-MS method) of zircon from intrusive rocks at the Jilau W-Au depositстатья
- Авторы: Soloviev S.G., Kryazhev S.G., Semenova D.V., Kalinin Y.A., Bortnikov N.S.
- Журнал: Doklady Earth Sciences
- Том: 512
- Номер: 2
- Год издания: 2023
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 938
- Последняя страница: 942
- DOI: 10.1134/S1028334X23601463
- Аннотация: The paper presents new isotopic U–Pb zircon data (LA-ICP-MS method) on the intrusive rocksfrom 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 correspondedto 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 beenidentified; they probably represent the age of the orogenic basement including that of the basement terranes of the Tarim and Karakum cratons.
- Добавил в систему: Соловьев Сергей Гарольдович