Abstract

The isotopic U–Pb ages are estimated for zircons (for the first time by the LA–ICP–MS method) from biotite (Eldzhurty) granites and for the first time from the rhyolites at the giant Tyrnyauz Mo–W deposit (North Caucasus). The weighted mean isotopic U–Pb age of zircon from the Eldzhurty granites is 2.10 ± 0.08 Ma, with variations from 1.78 to 2.53 Ma, whereas that of zircon from the rhyolites is 2.05 ± 0.04 Ma, with variations from 1.81 to 2.42 Ma. These data confirm the Neogene (Pleistocene) age of the rock crystallization, are in agreement with the emplacement sequence, and emphasize the short time span (~50 ky) between them.

中文翻译：

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Tyrnyauz Mo-W 矿床 Eldzhurty 花岗岩和流纹岩锆石的 LA-ICP-MS 同位素 U-Pb 年龄（俄罗斯北高加索）

摘要

对来自黑云母 (Eldzhurty) 花岗岩和巨型 Tyrnyauz Mo-W 矿床 (北高加索) 的流纹岩的锆石 (首次通过 LA-ICP-MS 方法) 的同位素 U-Pb 年龄进行估计. Eldzhurty 花岗岩锆石的加权平均同位素 U-Pb 年龄为 2.10 ± 0.08 Ma，变化范围为 1.78 至 2.53 Ma，而流纹岩锆石的加权平均同位素 U-Pb 年龄为 2.05 ± 0.04 Ma，变化范围为 1.81 至 2.422 Ma。这些数据证实了岩石结晶的新近纪（更新世）年龄，与就位序列一致，并强调了它们之间的短时间跨度（~50 ky）。