Age of the Zashikhinskoye Rare Metal Deposit (Eastern Sayan): Results of U–Pb (ID TIMS) Geochronological Studies of Metamictic Zircon

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-06-20 DOI:10.1134/s1028334x24602529

D. A. Lykhin, A. A. Ivanova, N. V. Alymova, E. B. Salnikova, A. B. Kotov, A. V. Nikiforov, A. A. Vorontsov, Yu. V. Plotkina, O. L. Galnikova, E. V. Tolmacheva

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Abstract

The issue of the age of rare-metal granites of the Zashikhinskoye field is discussed. To obtain U–Pb (ID TIMS) geochronological data, a modified “chemical abrasion” technique with preliminary high-temperature annealing was used for metamictic zircon. Estimates of the age of alkaline leucogranites and albitites coincide and correspond to the age of formation of rare-metal granites of the Zashikhinskoye field 267 ± 1 Ma. Within East Sayan, igneous rocks with close ages are not yet known. The closest area of magmatic activity of this time was the large zonal Khangai magmatic range, which arose under the influence of the mantle plume and is characterized by widespread development in its peripheral part of alkaline and bimodal associations, including rare-metal magmatic ones. The Zashikhinskoye field is more than 350 km from the edge of its range. Nevertheless, on the basis of geochronological and geochemical data, it was assumed that this field was associated with the activity of the Khangai plume.

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Zashikhinskoye稀有金属矿藏（东萨彦岛）的年龄：元古宙锆石的 U-Pb (ID TIMS) 地质学研究结果

摘要讨论了 Zashikhinskoye 矿区稀有金属花岗岩的年龄问题。为了获得铀-铅（ID TIMS）地质年代数据，对偏闪锆石采用了经过改进的 "化学研磨 "技术和初步高温退火技术。碱性白榴石和白云石的年龄估计值与 Zashikhinskoye 矿区稀有金属花岗岩的形成年龄 267 ± 1 Ma 相吻合。在东萨扬地区，尚未发现年代相近的火成岩。这个时期最接近岩浆活动的地区是大地带性的康盖岩浆山脉，该山脉是在地幔羽流的影响下形成的，其特点是在其周边地区广泛发育碱性和双峰联合体，包括稀有金属岩浆联合体。扎希钦斯科耶岩田距离其山脉边缘超过 350 公里。不过，根据地质年代和地球化学数据，可以推测该岩田与 Khangai 羽流的活动有关。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.